TDA7433D - STMicroelectronics

TDA7433

BASIC FUNCTION AUDIO PROCESSOR

TWO STEREO AND ONE MONO INPUTS

CONTROLLED

MUTE FUNCTION (SOFTWARE AND HARD-

WARE)

VOLUME CONTROL IN 1dB STEP

FOUR SPEAKER ATTENUATORS:

– Independent attenuation control

– Independent mute function

ALL FUNCTIONS PROGRAMMABLE VIA

I2CBUS

DESCRIPTION

The TDA7433 is a volume, tone (bass and treble)

balance (Left/Right) processor for quality audio

applications in car radio and Hi-Fi systems.

Control is accomplished by serial bus microproc-

essor interface.

The AC signal setting is obtained by resistor net-

works and switches combined with operational

amplifiers.

Thanks to the advanced BIPOLAR/CMOS Tech-

nology, the external components have been re-

duced.

November 1999

IN1_L

SUPPLY

GND

VOL BASS TREBLE

D95AU354A

S BUS DECODER + LATCHES

SPKR

ATT

SPKR

ATT

VOL BASS TREBLE SPKR

ATT

SPKR

ATT

SCL

SDA

RIGHT FRONT

RIGHT REAR

LEFT REAR

LEFT FRONT

IN1_R

MUX

MONO IN/MUTE

IN2_L

IN2_R

10 9 11

1 8712

BINL BOUTL TRL

BINR BOUTR TRRCREF

100nF 100nF

4.7K

2.7nF

100nF 100nF 2.7nF

4.7K

BLOCK DIAGRAM

SO20

ORDERING NUMBER: TDA7433D

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ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VSOperating Supply Voltage 10.2 V

Tamb Operating Temperature Range -40 to 85 °C

Tstg Storage Temperature Range -55 to +150 °C

QUICK REFERENCE DATA

Symbol Parameter Min. Typ. Max. Unit

VSSupply Voltage 7 9 10.2 V

VCL Max. Input Signal Handling 1.3 1.6 Vrms

THD Total Harmonic Distortion (V = 1Vrms f = 1kHZ) 0.05 %

S/N Signal to Noise Ratio 102 dB

Sc Channel Separation f = 1kHz 100 dB

Volume Control 1dB step -79 +32 dB

Bass Control 2dB step -18 +18 dB

Treble Control 2dB step -14 +14 dB

Speaker Attenuators -37.5 0 dB

Mute Attenuation 100 dB

THERMAL DATA

Symbol Parameter Value Unit

Rth j-pins Thermal Resistance Junction-pins Max. 150 °C/W

CREF

IN2_R

IN2_L

MONO IN/MUTE

IN1_R

BOUT_R

IN1_L

BIN_R

BOUT_L TRR

OUT_RR

OUT_LR

OUT_LF

OUT_RF

SCL

SDA

GND1

BIN_L TRL

D95AU355A

PIN C ONNECTION (Top View)

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IN1_L

SUPPLY

GND

VOL BASS TREBLE

D95AU356A

S BUS DECODER + LATCHES

SPKR

ATT

SPKR

ATT

VOL BASS TREBLE SPKR

ATT

SPKR

ATT

SCL

SDA

RIGHT FRONT

RIGHT REAR

LEFT REAR

LEFT FRONT

IN1_R

MUX

MONO/

MUTE

IN2_L

IN2_R

10 9 11

1 8712

CREF BINR BOUTR TRR

TRLBOUTLBINL

10µF100nF 100nF

4.7K

2.7nF

100nF 100nF

4.7K 2.7nF

100nF

VS 9V

100nF

APPLICATION DI AGRAM

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ELECTRICA L CHARACTERI STICS (T amb = 25°C, VS = 9V, RL = 10kΩ, Rg = 50Ω,

all variable gains = 0dB, f = 1kHz, unless otherwise specified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

INPUT SELECTOR

RIN Input Resistance 70 100 130 kΩ

VCL Clipping Level d ≤ 0.3% 1.3 1.6 Vrms

SIN Input Separation 70 100 dB

AMUTE Input Mute Attenuation 70 95 dB

VDC Mute DC Step 0.2 10 mV

MUTE AT AM INPUT (*)

VIL Input Low Voltage AM not selected 0.4 V

VOLUME CONTROL

GMAX Max. Gain Note 2 30.5 32 33.5 dB

AMAX Max Attenuation 75 79 83 dB

Astep Step Resolution 0.5 1 1.5 dB

EAAttenuation Set Error G = +20 to -20dB -1.0 0 +1.0 dB

G = -20 to -60dB -2 2 dB

ETTracking Error G = -20 to -60dB 2 dB

VDC DC Steps Adjacent Attenuation Steps,

Range from 0 to -79dB 0.1 4 mV

From 0dB to -79dB 0.5 10 mV

BASS CONTROL

BRANGE Max. Bass boost 15.5 18 20 dB

BCUT Max. Bass cut -20 -18 15.5 dB

AStep Step Resolution 1 2 3 dB

RBInternal Feedback Resistance 48 65 82 kΩ

TREBLE CONTROL

CRANGE Control Range ±13 ±14 ±15 dB

Astep Step Resolution 1 2 3 dB

SPEAKER ATTENUATORS

CRANGE Control Range 36 37.5 39 dB

Astep Step Resolution From 0 to -24dB 0.5 1 1.5 dB

AMUTE Output Mute Attenuation From 0 to -24dB 70 90 dB

EAAttenuation Set Error 1 dB

VDC DC Steps Adjacent Attenuation Steps 0.1 4 mV

AUDIO OUTPUTS

VCLIP Clipping Level d = 0.3% 2 2.5 Vrms

GOUT Output Gain (fixed) 4 dB

RLOutput Load Resistance AC - connected 3 kΩ

DC connected to GND 5

CLOutput Load Capacitance 10 nF

ROUT Output Impedance 30 100 Ω

VDC DC Voltage Level 3.7 4.0 4.3 V

(*) The mute function can be activated without using the I2C bus by grounding the AM input when AM is not selected. This causes the input

multiplexer to select the reference voltage instead of an input signal.

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ELECTRICA L CHARACTERI STICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

GENERAL

VSSupply Voltage 6 9 10.2 V

ISSupply Current 5 8 11 mA

PSRR Power Supply Rejection Ratio 65 85 dB

eNO Output Noise 20Hz - 20kHz "A" - weighted

BW = 200Hz - 20kHz, flat

output muted

7.0

5.5 20 µV

µV

S/N Signal to Noise Ratio all gains = 0dB; VO = 1Vrms 102 dB

d Distortion VOUT = 1Vrms 0.05 0.15 %

Sc Channel Separation 70 80 dB

ETTotal Tracking Error AV = 0 to -20dB

AV = -20 to -60dB 0

2dB

BUS INPUTS

VIL Input Low Voltage 1 V

VIH Input High Voltage 3 V

IIN Input Current VIN = 0.4V -5 +5 µA

VOOutput Voltage

SDA Acknowledge IO = 1.6mA 0.15 0.4 V

SOFTWAR E SPECIFICA TION

Interface Protocol

The interface protocol comprises:

– a start condition (S)

– a chip address byte (t he LSB bit determines read /write transmission)

– a subaddress byte

– a sequence of data (N-bytes + acknowledge)

– a stop condition (P)

S1000101R/WACKXXXIA

0ACK DATA ACK P

ACK = Acknowledge

S = Star t

P = Stop

MAX CLOCK SPEED 500kbits/s

Auto Increment

If bit I in the subaddress byte is set to "1", the autoincrement of the subaddres s is enabled.

CHIP ADDRESS

MSB LSB

SUBADDRESS

MSB LSB MSB

DA T A 1...DAT A n

LSB

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SUBADDRESS (rece ive mode)

MSB LSB FUNCTION

X X X I A3A2A1A0

Input selector

Volume

Bass, Treble

Speaker attenuator LF

Speaker attenuator LR

Speaker attenuator RF

Speaker attenuator RR

I = Auto increment

X = Not used

DATA BYTE SPECIFICATION

X = not relevant; set to "1" during testing

Input Selector

MSB LSB FUNCTION

D7D6D5D4D3D2D1D0

IN2

IN1

mono IN

no input selected

mute (low homic)

non-symmetrical bass cut (note 1)

symmetrical bass cut

extended bass range

standard bass range ±14dB

For example to select the IN2 input the Data Byte is: X X X X X 0 1 0.

An additional direct mute function is included in the Speaker Attenuators.

Note 1: Bass cut for very low frequencies.

MSB LSB VOLUME

D7D6D5D4D3D2D1D0

+32dB

+16dB

0dB

-16dB

-32dB

-48dB

-64dB

0dB

-1dB

-2dB

-15dB

Note 2:

It is not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by

software to the maximum value, which is needed for the system.

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Bass, Treble

MSB LSB FUNCTION

D7D6D5D4D3D2D1D0

Input

Selector

Treble Steps

- 14dB

-12dB

-10dB

-8dB

-6dB

-4dB

-2dB

0dB

+2dB

+4dB

+6dB

+8dB

+10dB

+12dB

+14dB

Bass Steps

-18dB

-16dB

-14dB

-12dB

-10dB

-8dB

-6dB

-4dB

-2dB

0dB

+2dB

+4dB

+6dB

+8dB

+10dB

+12dB

+14dB

+16dB

+18dB

For example 12dB Treble and -8dB Bass give the following DATA BYTE: 0 0 1 1 1 0 0

Speaker Attenuators

MSB LSB SPEAKER ATTENUATOR

LF,LR,RF,RR

D7D6D5D4D3D2D1D0

0dB

-1dB

-24dB

-25.5dB

-27dB

-28.5dB

-30dB

-32dB

-34.5dB

-37.5dB

Speaker Mute

normal

range

±14dB

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Func tion a l Desc ri ption

The input s elector is able t o s elect 2 stereo inputs

and 1 mono input (AM). The inputs are DC biased

with 100kΩ resistors t o the int er nal reference volt-

age of 3V. The mono input can be used addition-

ally as hardware mute pin. If this pin is pulled to

ground by an external transistor and AM is not se-

lected, the input selector mutes the input (refer-

ence voltage selected). The AM part is consid-

ered to be swit ched OFF. I f the output of t he AM

part is not high ohmic in this condition, a series

resistor of about 20kΩ has to be foreseen.

The volume control can be programmed from a

gain of +32dB to an attenuation of -79dB in 1dB

steps. The maximum gain should be kept as low

as possible for system performance reason. It has

to be limited by software to the absolute neces-

sary system gain, depending on the signal sour ce

level and the power amplifier gain.

The bass control acts in a range from +18dB to -

18dB in 2dB steps. The filter response is deter-

mined by the external filter components. An ex-

tensive simulation software is av ailable in order t o

support the design of the bass filter response with

different filter configurations.

The extended bass boost range of +18dB allows

the implementation of the software loudness func-

tion by additional bass and treble boost.

The treble control acts in a range of ±14dB in 2dB

steps. The external capacitor determines with the

internal resistor of 50KΩ the corner frequency of

the treble response.

The four speaker attenuators can be controlled in-

dependently from 0 to -37.5dB, which allows the

implementation of balance and fader a the four

speaker system. The attenuation steps size is 1

db from 0 to -24 dB and increases non linearly up

to the maximum attenuation of 37.5dB. A special

mute bit forces the speaker attenuator into the

mute position.

All 4 outputs are low distortion push pull outputs,

able to drive a load of 3kΩ.

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110

1120

A1 C

SO20MEC

h x 45˚

SO20

DIM. mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.35 2.65 0.093 0.104

A1 0.1 0.3 0.004 0.012

B 0.33 0.51 0.013 0.020

C 0.23 0.32 0.009 0.013

D 12.6 13 0.496 0.512

E 7.4 7.6 0.291 0.299

e 1.27 0.050

H 10 10.65 0.394 0.419

h 0.25 0.75 0.010 0.030

L 0.4 1.27 0.016 0.050

K 0˚ (min .)8˚ (max.)

OUTLINE AND

MECHANICAL DATA

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of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is

grante d by implication or otherwis e under any patent or patent righ ts of STMicroelectronics. Specifica tion mentione d in this publication are

subj ect to change without notic e. This public ation supers edes and rep laces all informat ion p reviousl y supplied. STMi croelec tron ics product s

are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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