CS4330-BSR - Cirrus Logic, Inc.



Cirrus Logic, Inc. 1997

Cirrus Logic, Inc.

Crystal Semiconductor Products Division

P.O. Box 17847, Austin, Texas 78760

(512) 445 7222 FAX: (512) 445 7581

http://www.crystal.com

CS4330/31/33

8 Pin Stereo D/A Converter for Digital Audio

Features

Complete Stereo DAC System:

Interpolation, D/A, Output Analog Filtering

18-Bit Resolution

94 dB Dynamic Range

0.003% THD

Low Clock Jitter Sensitivity

Single +3 V or +5 V Power Supply

Filtered Line Level Outputs

Linear Phase Fi ltering

On-Chip Digital De-emphasis

Description

The CS4330, CS4331 and CS4333 are complete , stereo

digital-to-analog output systems including interpolation,

1-bit D/A conversion and output analog filtering in an 8-

pin package. These devices differ in the serial interface

format u sed to input audio dat a.

The CS4330, CS4331 and CS4333 are based on delta-

sigma modulation, where the modulator output controls

the reference voltage input to an ul tra-linear analog low-

pass filter. This architecture allows for infinite adjustment

of sample rate between 2 kHz and 50 kHz while main-

taining linear phase response simply by changing the

master clock frequency.

The CS4330, CS4331 and CS4333 contain on-chip dig-

ital de-emphasis, operate from a single +3 V or +5 V

power supply, and consume only 60mW of power wit h a

3 V power supply. These features make them ideal for

portable CD players and other portable playback

systems.

ORDERING INFORMATION

See page 21.

LRCK 3

SDATA 1

DEM/SCLK

MCLK

VA+

AOUTL

AOUTR

Serial Input

Interface

Interpolator

De-emphasis

Delta-Sigma

Modulator

Delta-Sigma

Modulator

DAC

Voltage Refer ence

Analog

Low-Pass

Filter

Analog

Low-Pass

Filter

AGND

MAY ‘97

DS136F1

ANALOG CHARACTERISTICS (TA = 25°C; Logic "1" = VA+; Logic "0" = AGND; MCLK = 12.288 MHz;

Full-Scale Output Sine Wave, 991 Hz; Input Sample Rate = 48 kHz; Input Data = 18 Bits; SCLK = 3.072 MHz;

Measurement Bandwidth is 10 Hz to 20 kHz, unweighted; unless otherwise specified. Resistive load = 20 kΩ, capaci-

tive load = 100 pF)

CS4330/31/33-KS

VA +5V CS4330/31/33-KS

VA +3V CS4330/31/33-BS

VA +5V only

Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Units

Specified Temperature Range TA-10 to 70 -10 to 70 -40 to +85 °C

Resolution - - 18 - - 18 - - 18 Bits

Dyna mic Pe rfor mance

Dynamic Range (A-weighted) 90 94 - - 89 - 88 94 - dB

Total Harmonic Distortion - 0.003 0.007 - 0.003 - - .003 .008 %

Total Harmonic Distortion + Noise

0 dB Out put ,

-20 dB Output,

-60 dB Output

THD+N -

-86

-72

-32

-81

-68

-28

-85

-67

-27

-80

-88

-86

-72

-32

-79

-66

-26

Deviation From Linear Phase (Note 1) - ± 0.5 --

± 0.5 --

± 0.5 -deg

Passband: to 0.05 dB corner (Note 2,3) 0 to 21.77 0 to 21.77 0 to 21.77 kHz

Frequ ency Resp onse 10 Hz to 20 kH z(Note 1) - ± 0.1 --

± 0.1 --

± 0.1 -dB

Passband Ripple (Note 3) - - ±0.05 --

±0.05 --

±0.05 dB

StopBand (Notes 2,3) 26.23 26.23 26.23 - - kHz

StopBand Attenuation (Note 4) 60 - - 60 - - 60 - - dB

Group Delay (Fs = Input Sample Rate) tgd - 16 / Fs - - 16 / Fs - - 16 / Fs - s

Interchannel Isolation (1 kHz) - 90 - - 90 - - 90 - dB

dc Accuracy

Interchannel Gain Mismatch - 0.1 - - 0.1 - - 0.1 - dB

Gain Error - - ± 10 --

± 10 --

± 10 %

Gain Drift - 250 - - 250 - - 250 - ppm/°C

An alog O utput

Full Scale Output Voltage 3.33 3.70 4.07 1.66 1.85 2.03 3.33 3.70 4.07 Vpp

Output Common Mode Voltage - 2.3 - - 1.3 - - 2.3 - VDC

Minimum Resistive Load - 10 - - 10 - - 20 - kΩ

Ma ximum Ca pacit ive Loa d - 100 - - 10 0 - - 1 00 - pF

Power Supplies

Power Supply Current: normal operation

power-down IA+

IA+ -

-28

60 32

-20

20 25

-28

60 32

-mA

µA

Power Dissipation normal operation

power-down -

-140

0.3 160

-60

0.06 75

-140

0.3 160

-mW

Power Sup ply Rejection Ratio (1 kHz) PSRR - 50 - - 50 - - 5 0 - dB

Notes: 1. Combined digital and analog filter characteristics.

2. The passband and stopband edges scale with frequency. For input sample rates, Fs, other than

48 kHz, the 0.05 dB passband edge is 0.4535×Fs and the stopband edge is 0.5465×Fs.

3. Digital f ilter characteris tics.

4. Measurement Bandwidth is 10 Hz to Fs (kHz)

CS4330, CS4331, CS4333

2DS136F1

SWITCHING CHARACTERISTICS (TA = 25 °C; VA+ = 2.7V - 5.5V; Inputs: Logic 0 = 0V, Logic

1 = VA+, CL = 20 pF) Switching characteristics are guaranteed by characterization.

Parameter Symbol Min Typ Max Units

Input Sample Rate Fs 2 - 50 kHz

LRCK Duty Cycle (External SCLK only) (Note 5) 30 50 70 %

MCLK Pulse Width High MCLK / LRCK = 5 12 10 - 1000 ns

MCLK Pulse Width Low MCLK / LRCK = 512 15 - 1000 ns

MCLK Pulse Width High MCLK / LRCK = 3 84 21 - 1000 n s

MCLK Pulse Width Low MCLK / LRCK = 384 21 - 1000 ns

MCLK Pulse Width High MCLK / LRCK = 2 56 35 - 1000 n s

MCLK Pulse Width Low MCLK / LRCK = 256 39 - 1000 ns

External SCLK Mode

SCLK Pulse Width Low tsclkl 20 - - ns

SCLK Pulse Width High tsclkh 20 - - ns

SCLK Period tsclkw 1

(128)Fs --ns

SCLK rising to LRCK edge delay tslrd 20 - - ns

SCLK rising to LRCK edge setup time tslrs 20 - - ns

SDATA valid to SCLK rising setup time tsdlrs 20 - - ns

SCLK rising to SDATA hold time tsdh 20 - - ns

Internal SCLK Mode

SCLK Period (Note 6) tsclkw 1

SCLK --ns

SCLK rising to LRCK edge tsclkr - tsclkw

2-µs

SDATA valid to SCLK rising setup time tsdlrs 1

(512)Fs + 15 --ns

SCLK rising to SDATA hold time MCLK / LRCK = 256 or 512 tsdh 1

(512)Fs +15 --ns

SCLK rising to SDATA hold time MCLK / LRCK = 384 tsdh 1

(384)Fs +15 --ns

Notes: 5. In Internal SCLK Mode, the Duty Cycle must be 50% ±1/ 2 MCLK Per iod.

6. The SCLK / LRCK ratio may be either 32, 48, or 64.

CS4330, CS4331, CS4333

DS136F1 3

sclkh

slrs

slrd

sdlrs

tsdh

sclkl

SDATA

SCLK

LRCK

External Serial Mode Input Timing

SDATA

LRCK

MCLK

*INTERNAL SCLK

Int erna l Ser ial Cloc k Gen erati on

* The SCLK pulses shown are internal to the CS4330/31/33.

N equals MCLK divided by SCLK

SDATA

**INTERNAL SCLK

*LRCK

sclkw

sdlrs

sdh

sclkr

Internal Seria l Mode Input Timing

* LRCK for CS4331

** The SCLK pulses shown are internal to the CS4330/31/ 33.

CS4330, CS4331, CS4333

4DS136F1

RECOMMENDED OPERATING CONDITIONS ( AGND = 0V; all v oltages with res pect t o

ground)

Parameter Symbol Min Typ Max Units

DC Power Supply: (3V mode) VA+ 2.7 3.0 4.0 V

(5V mode) VA+ 4.75 5.0 5.5 V

DIGITAL CHARACTERISTICS (TA = 25 °C; VA+ = 2.7V - 5.5V)

Parameter Symbol Min Typ Max Units

Hi gh- Leve l I npu t Vo ltag e (V A+ = 5. 5V) VIH 2.4 - - V

(VA+ = 5.0V) VIH 2.0 - - V

Low-Level Input Voltage VIL --0.8V

Input Leakage Current (Note 7) Iin -- ±10 µA

Notes: 7. Iin f or CS4331 L RCK is ± 20 µA max.

ABSOLUTE MAXIMUM RATINGS (AGND = 0V; all voltages with respect to ground.)

Parameter Symbol Min Max Units

DC Power Sup ply: VA+ -0.3 6.0 V

Input Current, Any Pin Except Supplies Iin -±10 mA

Digital Input Voltage VIND -0.3 (VA+)+0.4 V

Ambient Operating Temperature (power applied) TA-55 125 °C

Storage Temperature Tstg -65 150 °C

WARNING: Operation at or beyond these limits may result in permanent damage to the device.

Normal operation is not guaranteed at these extremes.

CS4330, CS4331, CS4333

DS136F1 5

DEM/SCLK

2.4k

Ω

Audio

Data

Processor

External Clock MCLK

AGND

AOUTR

CS4330

CS4331

CS4333

SDATA

LRCK

VA+

AOUTL

70.1

F+10

+3V/+5V

56k

Ω

Left Audio

Output

2.4k

Ω

56k

Ω

Right Audio

Output

* Required for AC coupling only

** C = 1

)(2400

Ω

)(Fs)(2)

Figure 1. Recommended Connection Diagram

CS4330, CS4331, CS4333

6DS136F1

GENERAL DESCRIPTION

The CS4330, CS4331, and CS4333 are complete

stereo digital-to-analog systems including digital

interpolation, 128× third-order delta-sigma digi-

tal-to-analog conversion, digital de-emphasis and

analog filtering, Figure 2. This architecture pro-

vides a high tolerance t o clock jit ter.

The primary purpose of using delta-sigma modu-

lation techniques is to avoid the limitations of

laser trimmed resistive digital-to-analog con-

verter architectures by using an inherently linear

1-bit digital-to-analog converter. The advantages

of a 1-bit digital-to-analog converter include:

ideal differential linearity, no distortion mecha-

nisms due to resistor matching errors and no

linearity drift over time and temperature due to

variations in re sistor values.

Digita l Interpolation Filt er

The digital interpolation filter increases the sam-

ple ra te by a factor of 32 an d is followed by a 4×

digital sample-and-hold to effectively achieve a

128× interpolation filter. This filter eliminates

images of the baseband audio signal which exist

at multiples of the input sample rate, Fs. This

allows for the selection of a less complex analog

filter based on out-of-band noise attenuation re-

quirements rath er than anti-image filtering .

Following the interpolation filter, the resulting

frequency spectrum has images of the input sig-

nal at multiples of 128× the input sample rate.

These images are removed by the external ana-

log filter.

Delta-Sigma Modulator

The interpolation filter is followed by a third-

order delta-sigma modulator which converts the

22-bit interpolation filter output into 1-bit data at

128× .

Switched-Capacitor Filter

The delta-sigma modulator is followed by a

digital-to-analog converter which translates the

1-bit data into a series of charge packets. The

magnitude of the charge in each packet is deter-

mined by sampling of a voltage reference onto a

switched capacitor, where the polarity of each

packet is controlled by the 1-bit signal. This

technique greatly reduces the sensitivity to clock

jitter and is a major improvement over earlier

generations of 1-bit digital-to-ana log converters.

Interpolator

Delta-Sigma

Modulator

DAC Analog

Low-Pass

Filter

Analog

Output

Digital

Input

Figure 2. System Block Diagram

CS4330, CS4331, CS4333

DS136F1 7

SYSTEM DESIGN

The CS4330/31/33 accept data at standard audio

frequencies including 48 kHz, 44.1 kHz and

32 kHz. Audio data is input via the serial data

input pin (SDATA). The Left/Right Clock

(LRCK) defines the channel and delineation of

data and the Serial Clock (SCLK) clocks audio

data into the input data buffer. The CS4330,

CS4331 and CS4333 differ in the serial data for-

mat as shown in Figures 4-7. The Master Clock

(MCLK) is used to operate the digital interpola-

tion filter and the delta-sigma modulator.

Master Clock

The MCLK must be either 256×, 384×, or 512×

the desired input sample rate, Fs. Fs is the fre-

quency at which words for each channel are

input to the digital-to-analog converter, and is

equal to the LRCK frequency. The MCLK to

LRCK frequency ratio is detected automatically

during the initialization sequence by counting

the number of MCLK transitions during a single

LRCK period. Internal dividers are set to gener-

ate the proper clocks for the digital filter,

delta-sigma modulator and switched-capacitor

filter. Table 1 illustrates several standard audio

sample rates and the required MCLK and LRCK

frequencies.

Serial Clock

The serial clock controls the shifting of data into

the input data buffers. The CS4330/31/33 sup-

port both external and internal serial clock

generation modes. Refer to Figures 4-7 for data

formats.

External Serial Clock Mode

The CS4330/31/33 will enter the External Serial

Clock Mode when 4 low to high transitions are

detected on the DEM/SCLK pin during any

phase of the LRCK period. When this mode is

enabled, the Internal Serial Clock Mode and de-

emphasis filter cannot be accessed. The

CS4330/31/33 must return to Power-Down to

exit this mode. Refer to Fi gure 8.

Internal Serial Clock Mode

In the Internal Serial Clock Mode, the serial

clock is internally derived and synchronous with

MCLK and LRCK. The SCLK/LRCK frequency

ratio is either 32, 48, or 64. Operation in this

mode is identical to operation with an external

serial clock synchronized with LRCK. This

mode allows access to the digital de-emphasis

function . Refer to Fig ure 8.

While the Internal Serial Clock Mode is pro-

vided to allow access to the de-emphasis filter,

the Internal Serial Clock Mode also eliminates

possible clock interference from an external

SCLK. Use of Internal Serial Clock Mode is al-

ways preferred, even when de-emphasis filtering

is not re quired.

De-Emphasis

The CS4330/31/33 include on-chip digital de-

emphasis. Figure 3 shows the de-emphasis curve

for Fs equal to 44.1 kHz. The frequency re-

sponse of the de-emphasis curve will scale

propo rtionally with changes in sample ra te, Fs.

The de-emphasis filter is active (inactive) if the

DEM/SCLK pin is low (high) for 8 consecutive

falling edges of LRCK. T his function is available

only in the internal serial clo ck mode.

LRCK

(kHz) MCLK (MHz)

256x 384x 512x

32 8.1920 12.2880 16.3840

44.1 11.2896 16.9344 22.5792

48 12.2880 18.4320 24.5760

Table 1. Common Clock Frequencies

CS4330, CS4331, CS4333

8DS136F1

Initialization and Powe r-Down

The Initialization and Power-Down sequence

flow chart is shown in Figure 8. The CS4330/31/33

enter the Power-Down mode upon initial power-

up. The interpolation filters and delta-sigma

modulators are reset, and the internal voltage ref-

erence, one-bit digital-to-analog converters and

switched-capacitor low-pass filters are powered

down. The device will remain in the Power-

Down mode until MCLK and LRCK are

presented. Once MCLK and LRCK are detected,

MCLK occurrences are counted over one LRCK

period to determine the MCLK/LRCK frequency

ratio. Power is then applied to the internal volt-

age reference and the +5 or +3 Volt power

supply mode is determined. Finally, power is

applied to the D/A converters and switched-ca-

pacitor filters, and the analog outputs will move

to approximately 2.3V (1.3V in 3V mode). This

process requires approximately 1ms plus 1024

cy cle s o f LRCK.

The CS4330/31/33 enter the Power-Down mode

within 1 period of LRCK if either MCLK or

LRCK is removed. The initialization sequence

begins when MCLK and LRCK are restored. If

the MCLK/LRCK frequency ratio or the VA+

voltage changes during Power-Down, the

CS4330/31/33 adapt to these new operating con-

ditions. It is recomended that the CS4330/31/33

not be powered up with the clocks (MCLK,

LRCK, SCLK) going.

Power Supply Determination

The nominal power supply voltage for the

CS4330/31/33 may be either +5 or +3 Volts.

"SMART Analog" circuitry senses the power

supply voltage during the initialization sequence

or when exiting the Power-Down mode. +5V op-

eration will be set with a 3.7 Vpp full scale

outp ut if VA+ is between 4.75 and 5.5 Volts. The

CS433 0/31/33 will be set for + 3V operation with

a 1.85 Vpp full scale output if VA+ is between

2.7 and 4.0 Volts. Supply voltages between 4.0

and 4.75 Volts should be avoided to prevent op-

eration in the 5V mode. In this condition there is

insufficient headroom to produce a 3.7 Vpp out-

put.

Grounding and Power Supply Decoupling

As with any high resolution converter, the

CS4330/31/33 require careful attention to power

supply and grounding arrangements to optimize

performance. Figure 1 shows the recommended

power arrangements with VA+ connected to a

clean +3/+5V supply. Decoupling capacitors

should be located as near to the CS4330/31/33

as possible.

Analo g Output and Filtering

The CS4330/31/33 analog filter is a switched-ca-

pacitor filter. The switched-capacitor filter

frequency response is clock dependent and will

scale with sample rate.

The digital filter of the CS4330/31/33 is de-

signed to compensate for the magnitude and

phase response of a single-pole low-pass filter at

twice the sample rate. Output filters consisting of

a 2.4 kohm resistor and capacitor are recom-

Gain

-10dB

0dB

Frequency

T2 = 15

T1=50

F1 F2

3.183 kHz 10.61 kHz

Figure 3. De-Emphasis Curve (Fs = 44.1kHz)

CS4330, CS4331, CS4333

DS136F1 9

In ter nal SC LK Mo de

External SCLK Mode

Right Justified, 18-Bit Data

Data Valid on Rising Edge of SCLK

INT SCLK = 64 Fs if MCLK/LRCK = 256 or 512

INT SCLK = 48 Fs if MCLK/LRCK = 384

Right Justified, 18-Bit Data

Data Valid on Rising Edge of SCLK

SCLK must have at least 36 cycles per LRCK

Figure 4. CS4330 Data Format

LRCK

SCLK

Left Channel Right Channel

SDATA 6543210987

15 14 13 12 11 10

10 6543210987

15 14 13 12 11 10

17 16 17 16

LRCK

SCLK

Left Channel Right C hannel

SDATA 6543210987

15 14 13 12 11 10 6543210987

15 14 13 12 11 10

In ter nal SC LK Mo de

I2S, 16-Bit Data

Data Valid on Rising Edge of SCLK

INT SCLK = 32 Fs if MCLK/LRCK = 512 or 256

INT SCLK = 48 Fs if MCLK/LRCK = 384

Figure 5. CS4331 Internal SCLK Data Format (I2S)

CS4330, CS4331, CS4333

10 DS136F1

LRCK

SCLK

Left Channel Right Channel

SDATA 6543210987

15 14 13 12 11 10 6543210987

15 14 13 12 11 10

In ter nal SC LK Mo de

External SCLK Mode

Right Justified, 16-Bit Data

Data Valid on Rising Edge of SCLK

INT SCLK = 32 Fs if MCLK/LRCK = 512 or 256

INT SCLK = 48 Fs if MCLK/LRCK = 384

Right Justified, 16-Bit Data

Data Valid on Rising Edge of SCLK

SCLK must have at least 32 cycles per LRCK

Figure 7. CS4333 SCLK Data Format

LRCK

SCLK

Left Channel Right Chan nel

SDATA 654321098715 14 13 12 11 1017 16 654321098715 14 13 12 11 1017 16

External SCLK Mode

I2S, 18-Bit Data

Data Valid on Rising Edge of SCLK

SCLK must have at least 36 cycles per LRCK

Figure 6. CS4331 External SCLK Data Format (I2S)

CS4330, CS4331, CS4333

DS136F1 11

USER: App ly Power

Power-Down Mode

USER: Apply MCLK and LRCK

256/384/512

MCLK/LRCK Determination

USER: set SCLK mode

Power Supply Determination

+3 or +5 Volt mode

USER: Apply SDATA

SCLK mode

Normal Operation

De-emphasis

available

Normal Operation

De-emphasis

not available

USER: Apply SDATA

Analog Output

is Generated Analog Output

is Generated

USER: Remove ClocksUSER: Remove Clocks

externalinternal

Figure 8. CS4330/31/33 Initialization and Power-Down Sequence

CS4330, CS4331, CS4333

12 DS136F1

mended on the analog outputs. The required ca-

pacitor value is defined by:

C = 1

(2π) (Fs) (2400 Ω) (2)

Example: Fs = 48 kHz

C = 690 pF

A value of 680 pF may be used with only 1.45%

error which is negligib le.

Combine d Digi tal an d Analog Filter Re sp onse

The frequency response of the combined analog

switched-capacitor filter, digital filter, and off-

chip single pole RC-filter at 2 Fs, is shown in

Figures 9, 10, 11, and 12. The overall response

is clock dependent and will scale with Fs. Note

that the response plots have been normalized to

Fs and can be de-normalized by multiplying the

X-axis scale by Fs.

Figure 9. CS4330/31/33 Combined Digital and Analog

Filter Stopband Rejection

Figure 10. CS4330/31/33 Combined Digital and Analog

Filter Transition Band

Figure 11. CS4330/31/33 Combined Digital and Analog

Filter Transition Band

Figure 12. CS4330/31/33 Combined Digital and Analog

Filter Passband Ripple

CS4330, CS4331, CS4333

DS136F1 13

Pe r f o r m a nce Pl ots

The following CS4330/31/33 measurement plots

were taken on the CDB4330/31/33 evaluation

board with an Audio Precision Dual Domain

System One. All plots are done in +5V mode at

a 48 kHz sampling rate, and are shown in Fig-

ures 13-20.

Figure 13 shows the CS4330/31/33 frequency re-

sponse. The response is flat to 20 kHz ± 0.1dB

as specified.

Figure 14 shows THD+N versus signal ampli-

tude fo r a 1 kHz 20-bit dithered input signal.

Figure 15 shows a 16k FFT of a 1 kHz full-scale

input signal. The signal has been filtered by a

notch filter within the System One to remove the

fundamental component of the signal. This mini-

mizes the distortion created in the analyzer

analog-to-digital converter. This technique is dis-

cussed by Audio Precision in the 10th

anniversary edition of AUDIO.TST.

Figure 16 shows a 16k FFT of a 1 kHz -3 dBFs

input signal. The signal has been filtered by a

notch filter within the System One to remove the

fundamental componen t of the sig nal.

Figure 17 shows a 1 6k FFT of a 1 kHz -20 dBFs

input signal. The signal has been filtered by a

notch filter within the System One to remove the

fundamental componen t of the sig nal.

Figure 18 shows a 1 6k FFT of a 1 kHz -60 dBFs

input signal.

Figure 19 shows a 1 6k FFT of a 1 kHz -90 dBFs

input signal.

Figure 20 shows the fade-to-noise linearity. The

input signal is a dithered 18-bit 500 Hz sine

Figure 13. Frequency Response

Figure 14. THD+N vs. Amplitude

Figure 15. 0 dBFs FFT

CS4330, CS4331, CS4333

14 DS136F1

wave which fades from -60 to -120 dBFs. Dur-

ing the fade, the output from the CS4330/31/33

is measured and compared to the ideal level. No-

tice the very close tracking of the output level to

the ideal, even at low level inputs. This indicates

very good low-level linearity, one of the key

benefits of delta-sigma digital-to-analog conver-

sion.

Figure 19. -90 dBFs FFT

Figure 20. Fade-to-Noise Linearity

Figure 18. -60 dBFs FFT

Figure 16. -3 dBFs FFT

Figure 17. -20 dBFs FFT

CS4330, CS4331, CS4333

DS136F1 15

Configuration Re gister

The CS4330, CS4331, CS4333 support multiple

2’s-complement data/clock formats. The required

format is governed by the contents of the Con-

figuration Register. The 5-bit register determines

which serial data format is acceptable, the fre-

quency of the Internal Serial Clock, on which

edge of SCLK audio data must be valid, and the

number of bits to be loaded into the input buffer.

On initial power-up, the register is loaded with

the default settings, and it is not necessary to

write to the register if this format is appropriate.

The default settings are shown in Figures 4-7.

The 8-bit code includes a 3-bit preamble to pre-

vent accidental access to the Configuration

ing edge of LRCK as shown in the Figures 21

and 22. The code 01000000 is considered to be

an error condition and is ignored. The configura-

tion routine requires that the SDATA pin is held

high, as shown in Figures 21 and 22, to prevent

accidental writing to the register. The Configura-

tion Register is only accessible prior to entering

the External Serial Clock Mode. For I2S mode,

the user must set B6 to 0, and B7 to 1.

B1 B2 B3 B4 B5 B6 B7 B8

B1 B2 B3 Configuration Access Code

0 1 0 Acce ss Allowed

All other Codes Access Denied

B4 B5 Internal SCLK Mode only

Sets Internal SCLK/LRCK Ratio *

0 0 SCLK/LRCK = 32

01 Reserved

1 0 SCLK/LRCK = 64

1 1 SCLK/LRCK = 128

* The Internal SCLK will be 48 Fs, if th e

MCLK/LRCK ratio is 384×.

B4 B5 External SCLK Mode only

Selects Data Sampling edge of SCLK

1 0 Rising edge of SCLK

1 1 Falling edge of SCLK

B6 Left or Right Justified Data

in relation to LRCK transitio n

0 Left Justified

1 Right Justified

B7 I2S Data Format

0Disabled

1Enabled

B8 Sets the number of Bits

0 18 Bits

1 16 Bits

Schematic & Layout Review Service

Confirm Optimum

Schematic & Layout

Before Building Your Board.

Confirm Optimum

Schematic & Layout

Before Building Your Board.

For Our Free Review Service

Call Applications Engineering.

For Our Free Review Service

Call Applications Engineering.

Call:(512)445-7222

CS4330, CS4331, CS4333

16 DS136F1

Figure 22. Configuration Timing

Figure 21. Configuration Operation

Parameter Symbol Min Typ Max Units

DEM/SCLK TIMING

DEM/SCLK va lid to LRCK falling set up time tclrs 20 - - ns

LRCK falling to DEM/SCLK hold time tclrh 20 - - ns

SDATA setup time tsetup 1--us

SDATA hold time thold 1--us

Ta ble 2 . Conf ig urat io n T imin g C har act eri sti cs

CS4330, CS4331, CS4333

DS136F1 17

REFERENCES

1)"An 18-Bit, 8-Pin Stereo Digital-to-Analog

Converter" by J.J. Paulos, A.W. Krone, G.D

Kamath, and S.T. Dupuie. Paper presented at the

97th Convention of the Audio Engineering Soci-

ety, November 1994.

2)"How to Achieve Optimum Performance from

Delta-Sigma A/D & D/A Converters" by Steven

Harris. Paper presented at the 93rd Convention

of the Audio Engin eering Society, Octobe r 1992.

3)"Multiplier-Free Interpolation for Oversampled

Digital-to-Analog Conversion" by Jeffrey W.

Scott. Paper presented at the 92nd Convention of

the Au dio Engi neering Societ y, Marc h 1992.

4)"An 18-Bit Stereo D/A Converter With Inte-

grated Digital and Analog Filters" by Nav S.

Sooch, Jeffrey W. Scott. Paper presented at the

91st Convention of the Audio Engineering Soci-

ety, November 1991.

5)CDB4330/31/33 Evaluation board Data Sheet;

DS136DB2 MAR’96

CS4330, CS4331, CS4333

18 DS136F1

PIN DESCRIPTIONS

Power Supply Connections

VA+ - Positive Analog Power, PIN 7.

Positive analog supply. Nominally +5V or +3V.

AGND - Analog Ground, PIN 6.

Analog ground referen ce.

Analog Outputs

AOUTL - Analog Le ft Channel Output, PIN 8.

Analog output for the left channel. Typically 3.7 Vpp for a full-scale input signal at VA+ = 5V

and 1. 85 Vpp at VA+ = 3V.

AOUTR - Analog Right Channel Output, PIN 5.

Analog output for the ri ght channel. Typ ically 3.7 Vpp for a full-scale input signal at VA+ = 5V

and 1. 85 Vpp at VA+ = 3V.

Digita l Inputs

MCLK - Master Clock Input, PIN 4.

The frequency must be 256×, 384× , o r 512× the in put sample rate (Fs).

LRCK - Left/Right Clock, PIN 3.

This input determines which channel is currently being input on the Audio Serial Data Input

pin, SDATA.

SDATA - Audio Se rial Data Input, PIN 1.

Two’s complement MSB-first serial data is input on this pin. The data is clocked into the

CS4330, CS4331, and CS4333 via internal or external SCLK and the channel is determined by

LRCK.

DEM/SCLK - De-emphasis / External serial clock input , PIN 2.

A dual-purpo se input used for de-emphasis filter control or external serial clock input.

SERIAL DATA INPUT SDATA AOUTL ANALOG LEFT CHANNEL OUTPUT

DE-EMPHASIS / SCLK DEM/SCLK VA+ ANALOG POWER

LEFT / RIGHT CLOCK LRCK AGND ANALOG GROUND

MASTER CLOCK MCLK AOUTR ANALOG RIGHT CHANNEL OUTPUT

72 63 54

CS4330, CS4331, CS4333

DS136F1 19

PARAMETER DEFINITIONS

Total Harmonic Distortion + Noise (THD+N)- The ratio of the rms value of the signal to the rms

sum of all other spectral components over the specified bandwidth (typically 10 Hz to 20 kHz),

inclu ding distorti on components. Expressed in decibels.

Dynamic Range - The ratio of the full scale rms value of the signal to the rms sum of all other

spectral components over the specified bandwidth. Dynamic range is a signal-to-noise

measurement over th e specified bandwidth made with a -60 dBFs signal. 60 dB is then add ed to

the resulting measurement to refer the measurement to full scale. This technique ensures that

the distortion components are below the noise level and do not effect the measurement. This

measurement technique has been accepted by the Audio Engineering Society, AES17-1991, and

the Electroni c Indu stries Ass ociation of Japan, EIAJ CP-3 07.

Interchannel Isolation - A measure of crosstalk between the left and right channels. Measured for

each channel at the converter’s output with all zeros to the input under test and a full-scale

signal applied to the other cha nnel. Units in decibels.

Interchannel Gain Mismatch - The gain difference b etween left and right channels. Units in decibels.

Gain Error - Th e deviation from the nomina l full scale analog output for a full scale digital input.

Gain Drift - The chan ge in gain value wit h temperatu re. Units in ppm/°C.

CS4330, CS4331, CS4333

20 DS136F1

ORDERING INFORMATION:

Model Temperature Package

CS4330-KS -10 to +70°C 8 -pin Plastic SOIC

CS4331 -KS -10 to +70°C 8-pin Plastic SOIC

CS4333 -KS -10 to +70°C 8-pin Plastic SOIC

CS4330 -BS -40 to +85°C 8-pin Plastic SOIC

CS4331 -BS -40 to +85°C 8-pin Plastic SOIC

CS4333 -BS -40 to +85°C 8-pin Plastic SOIC

MILLIMETERS

INCHES

MIN MAX MAXMINDIM

TYP

1.27

0.050 TYP

0.010

0.25

0.070 0.074

1.77 1.88

0.006 0.010

0.15 0.25

080

0.0300.019

0.48 0.76

0.3190.302

0.203 0.210

5.15 5.35

7.67 8.1

5.18 5.4

0.204

0.213

8-Pin

SOIC

0.33 0.51

0.020

0.013

PACKAGE DIMENSIONS

Note: The EIAJ package is not a standa rd JEDEC pac kage size

CS4330, CS4331, CS4333

DS136F1 21

• Notes •

Features

•Demonstrates recommended layout

and grounding arrangements

•CS8412 Receives AES/EBU, S/PDIF,

& EIAJ-340 Compatible Digital Audio

•Digital and Analog Patch Areas

•Requires only a digital signal source

and power supplies for a complete

Digital-to-Analog-Converter system

General Description

The CDB4330/31/33 evaluation board is an excellent

means for quickly evaluating the CS4330/31/33 18-bit,

stereo D/A converter. Evaluation requires an analog

signal analyzer, a digital signal source and a power

supply. Analog outputs are provided via RCA connec-

tors for both channels.

The CS8412 digital audio receiver I.C. provides the

system timing necessary to operate the CS4330/31/33

and will accept AES/EBU, S/PDIF, and EIAJ-340

compatible audio data. The evaluation board may also

be configured to accept external timing signals for op-

eration in a user application during system

development.

ORDERING INFORMATION: CDB4330, CDB4331,

CDB4333

Evaluation Board for CS4330 / CS4331 / CS4333

CDB4330

CDB4331 CDB4333

Digital

Audio

Input

I/O for

Clocks

and Data

CS8412

Digital

Audio

Interface

CS4330/31/33 Analog

Filter

Crystal Semiconductor Corporation

P.O. Box 17847, Austin, TX 78760

(512) 445-7222 Fax: (512) 445 7581

MAR ’96

DS136DB2

Co pyrigh t



Crystal Semiconductor Corporation 1996

CDB4330/31/33 System Overvie w

The CDB4330/31/33 evaluation board is an ex-

cellent means of quickly evaluating the

CS4330/31/33. The CS8412 digital audio inter-

face receiver provides an easy interface to digital

audio signal sources including the majority of

digital audio test equipment. The evaluation

board also allows the user to supply clocks and

data through a 10-pin header for system develop-

ment.

The CDB4330/31/33 schematic has been parti-

tioned into 5 schematics shown in Figures 2

through 7. Each partitioned schematic is repre-

sented in the system diagram shown in Figure 1.

Notice that the the system diagram also includes

the interconnections between the partitioned

schematics.

CS4330 /31/33 Digita l to Analo g Converter

A description of the CS4330/31/33 is included in

the CS4 330/31/33 data sheet.

CS8412 Digital Audio Receiver

The system receives and decodes the standard

S/PDIF data format using a CS8412 Digital

Audio Receiver, Figure 4. The outputs of the

CS8412 include a serial bit clock, serial data,

left-right clock (FSYNC), de-emphasis control

and a 256Fs master clock. The operation of the

CS8412 and a discussion of the digital audio in-

terface are included in the 1994 Crystal

Semiconductor Au dio Data Book.

During normal operati on, the CS8412 operates in

the Channel Status mode where the LED’s dis-

play channel status information for the channel

selected by the CSLR/FCK jumper. This allows

the CS8412 to decode and supply the de-empha-

sis bit from the digital audio interface for control

of the CS4330/31/33 de-emphasis filter via

pin 3, CC/F0, of t he CS8412.

When the Error Information Switch is activated,

the CS8412 operates in the Error and Frequency

information mode. The information displayed by

the LED’s can be decoded by consulting the

CS8412 data sheet. If the Error Information

Switch is activated, and the CS4330/31/33 is in

the internal serial clock mode, then it is likely

that the de-emphasis control for the

CS4330/31/33 will be erroneous and produce an

inco rrect audio output.

Encoded sample frequency information can be

displayed provided a proper clock is being ap-

plied to the FCK pin of the CS8412. When an

LED is lit, this indicates a "1" on the corre-

sponding pin located on the CS8412. When an

LED is off, this indicates a "0" on the corre-

sponding pin. Neither the L or R option of

CSLR/FCK should be selected if the FCK pin is

being driven by a cl ock signal.

The evaluation board has been designed such

that the input can be either optical or coax, Fig-

ure 6. It is not necessary to select the active

input. However, both inputs can not be driven si-

multaneously.

CS841 2 Data Format

The CS8412 data format can be set with jumpers

M0, M1, M2, and M3. These formats are shown

in the CS8412 datasheet found in the 1994 Crys-

tal Semiconductor Audio Data Book. The format

selected must be compatible with the corre-

sponding data format of the CS4330/31/33

shown in Figures 4-7 of the CS4330/31/33

datasheet. The default settings for M0-M3 on the

evaluation board are given in Tables 2-4. The

compatible data formats we have chosen for the

CS841 2 and CS4330/31/33 are:

CS841 2 format 6;CS4330

CS841 2 format 2;CS4331 (External SCLK only)

CS841 2 format 5;CS4333 (External SCLK only)

CDB4330, CDB4331, CDB4333

24 DS136DB2

Analog output filter

The recommended single pole filter required for

the CS4330/31/33 has been combined with a

unity gain output buffer (see Figure 2). The ana-

log output filter uses a Motorola MC33202

single supply, dual op-amp. The low pass filter

corner frequency is located at 2 Fs, or 88.2 kHz

and is calculated by:

= 1

(2π) (

8 ||

9) (

29)

= 1

(2π) (15

Ω || 6.65

Ω) (390

) = 88.5 kHz

Power Supply Circuitry

Power is supplied to the evaluation board by

three binding posts (GND, +5V, +3V/+5V), See

Figure 7. The +5V input supplies power to the

+5 Volt digital circuitry (VD+5), while the

+3V/+5V input supplies power to the Voltage

Level Converter (VD+3/+5), and CS4330/31/33

(VA+3/+5) for evaluation in either +3 or +5 Volt

mode. The op-amp is supplied from the analog

supply (VA+) which can be derived from either

the +5V post (VA+5) or the +3/+5V post

(VA+3/+5) depending upon which Ferrite bead

(L4 or L5) is installed. The evaluation board is

configured with VA+ derived from VA+5 (L5 in-

stalled). To derive VA+ from the +3V/+5V post

(VA+3/+5), remove the Ferrite bead at L5, and

install it at L 4.

Input/Output for Clocks and Data

The evaluation board has been designed to allow

the interface to external systems via the 10-pin

header, J1. This header allows the evaluation

board to accept externally generated clocks and

data. The schematic for the clock/data I/O is

shown in Figure 5. The 74HC243 transceiver

functions as an I/O buffer where the CLK

SOURCE jumper determines if the transceiver

operates as a transmi tter or receiver.

The transceiver operates as a transmitter with the

CLK SOURCE jumper in the 8412 position.

LRCK, SDATA, and SCLK from the CS8412

will be available on J1. J22 must be in the 0 po-

sition and J23 must be in the 1 position for

MCLK to be an output and to avoid bus conten-

tion on MCLK.

The transceiver operates as a receiver with the

CLK SOURCE jumper in the EXTERNAL posi-

tion. LRCK, SDATA and SCLK on J1 become

inputs. The CS8412 must be removed from the

evaluation board for operation in this mode.

There are 2 options for the source of MCLK in

the External Clock Source mode. MCLK can be

an input with J23 in the 1 position and J22 in the

0 position. However, the recommended mode of

operation is to generate MCLK on the evaluation

board. MCLK becomes an output with LRCK,

SCLK and SDATA i nputs. This techn ique insures

that the CS4330/31/33 receives a jitter free clock

to maximize performance. This can be accom-

plished by installing a crystal oscillator into U5,

see Figure 4 (the socket for U5 is located within

the footprint for the CS8412) and placing J22 in

the 1 position and J23 in the 0 positio n.

Grounding and Power Supply Decoupling

The CS4330/31/33 requires careful attention to

power supply and grounding arrangements to op-

timize performance. Figure 2 shows the

recommended power arrangements. The

CS4330/31/33 is positioned over the analog

ground plane near the digital/analog ground

plane split. These ground planes are connected

elsewhere on the board. This layout technique is

used to minimizing digital noise and to insure

proper power supply matching/sequencing. The

decoupling capacitors are located as close to the

CS4330/31/33 as possible. Extensive use of

ground plane fill on both the analog and digital

sections of the evaluation board yield large re-

ductions in radiated noise effects.

CDB4330, CDB4331, CDB4333

DS136DB2 25

JUMPER PURPOSE POSITION FUNCTION SELECTED

CSLR/FCK selects channel for

CS8412 channel status

information

LSee CS8412 data sheet for details

Clock

Select Selects source of

system clocks and data *8412 CS8412 clock/data sourc e

EXT External clock/data source

J22

J23 Selects MCLK as Input

or Output *0

*1 See

Input/Output for Clocks and

Data

section of text

M0 CS8412 mode select *Low See CS8412 data sheet

for details

M1 *High

M2 *High

M3 *Low

SCLK Selects SCLK Mode INT Internal SCLK Mode

*EXT External SCLK Mode

DEM_8412 Selects source of de-

emphasis control *Low CS8412 de-emphasis

High De-emphasis input static high

* D efault set ti ng f rom fa ctor y

Table 2. CDB4330 Jump er Selectabl e Opti ons

CONNECTOR INPUT/OUTPUT SIGNAL PRESENT

+5V input (VD+5V) for CS8412 and digital section

input (VA+) for Analog output filter op-amp

(configured for +5V)

+3/+5V input (VD+3/+5V) for Voltage Level Conver ter

input (VA+3/+5V) for CS4330/31/33

GND input ground connection from power supply

Digital Input input digital audio interface input via coax

Optical Input input digital audio interface input via optical

MCLK, SCLK,

LRCK input/output I/O for master, serial, and left/right clock s

SDATA input/output I/O for ser ial data

AOUTL output left channel analog output

AOUTR output right channel analog output

Table 1. System Connections

CDB4330, CDB4331, CDB4333

26 DS136DB2

JUMPER PURPOSE POSITION FUNCTION SELECTED

CSLR/FCK selects channel for

CS8412 channel status

information

LSee CS8412 data sheet for details

Clock

Select Selects source of

system clocks and data *8412 CS8412 clock/data sourc e

EXT External clock/data source

J22

J23 Selects MCLK as Input

or Output *0

*1 See

Input/Output for Clocks and

Data

section of text

M0 CS8412 mode select *Low See CS8412 data sheet

for details

M1 *High

M2 *Low

M3 *Low

SCLK Selects SCLK Mode INT Internal SCLK Mode (Note 1)

*EXT External SCLK Mode (Note 1)

DEM_8412 Selects source of de-

emphasis control *Low CS8412 de-emphasis

High De-emphasis input static high

* D efault set ti ng f rom fa ctor y

Note 1. The CS8412 output data format requires the CS4331 be in the External SCLK Mode

Table 3. CDB4331 Jump er Selectabl e Opti ons

JUMPER PURPOSE POSITION FUNCTION SELECTED

CSLR/FCK selects channel for

CS8412 channel status

information

LSee CS8412 data sheet for details

Clock

Select Selects source of

system clocks and data *8412 CS8412 clock/data source

EXT External clock/data source

J22

J23 Selects MCLK as Input

or Output *0

*1 See

Input/Output for Clocks and

Data

section of text

M0 CS8412 mode select *High See CS8412 data sheet

for details

M1 *Low

M2 *High

M3 *Low

SCLK Selects SCLK Mode INT Inter nal SCLK Mode (Note 1)

*EXT External SCLK Mode (Note 1)

DEM_8412 Selects source of de-

emphasis control *Low CS8412 de-emphasis

High De-emphasis input static high

* Default setting from factor y

Note 1. The CS8412 output data for mat requires the CS4333 be in the External SCLK Mode

Table 4. CDB4333 Jumper Selectable Options

CDB4330, CDB4331, CDB4333

DS136DB2 27

Digital

Audio

Input

Fig 6

I/O for

Clocks

and Data

Fig 5

CS8412

Digital

Audio

Interface

RXN

RXP

MCLK

LRCK

SCLK

SDATA Fig 2

AOUTL

AOUTR Fig 2

Fig 4

CS4330/31/33

Power

Down

Fig 3

Voltage

Level

Converter

Fig 3

MCLK

LRCK

SCLK

SDATA

Analog

Filter

Figure 1. System Block Diagram and Signal Flow

CDB4330, CDB4331, CDB4333

28 DS136DB2

Figure 2. CS4330/31/33 and Connections

CDB4330, CDB4331, CDB4333

DS136DB2 29

Figure 3. Volt age Level Conv ersion and Power Down Circuitr y

CDB4330, CDB4331, CDB4333

30 DS136DB2

NOTE: U2 and U5 cannot be instal led simultaneously

Figure 4. CS8412 Digital Audio Receiver Connections

CDB4330, CDB4331, CDB4333

DS136DB2 31

Fig ure 5. I/O I nterf ac e for C lock s and Data

Optical Toshiba part TORX173 available through Insight Electronics

Figure 6. Digital Audio Input

CDB4330, CDB4331, CDB4333

32 DS136DB2

Figure 7. Power Supply

CDB4330, CDB4331, CDB4333

DS136DB2 33

Figure 8. CDB4330/31/33 Component Side Silkscreen

CDB4330, CDB4331, CDB4333

34 DS136DB2

Figure 9. CDB4330/31/33 Component Side (top)

CDB4330, CDB4331, CDB4333

DS136DB2 35

Figure 10. CDB4330/31/33 Solder Side (bottom)

CDB4330, CDB4331, CDB4333

36 DS136DB2

• Notes •

Advance product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made

best efforts to ens ure that the information contained in this document is accurate and reliable. However, the information is subject to change

without notice and is provided “AS IS” without warranty of any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for

the us e o f this in for ma tion, nor for infri nge men ts of p aten ts or othe r ri ghts of third p ar ties. T his doc um ent is the p ro perty of Cirrus Logic, Inc. a nd

implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publication may be copied, reproduced, stored in a

retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise). Furthermore, no par t of this

publication may be used as a basis for manufacture or sale of any items without the prior written consent of Cirrus Logic, Inc. The names of

pro ducts of Cirr us Lo gi c, Inc. or o ther v en dor s an d s upp lier s appearing in t his d oc ume nt m ay be trademark s or ser vic e m ark s of their respective

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