General Description
Operating at 1.8V from a single power supply, the
MAX9516 amplifies standard-definition video signals and
only consumes 6mW quiescent power and 12mW average
power. The MAX9516 leverages Maxim’s DirectDrive™
technology. Combining DirectDrive® with the external pos-
itive 1.8V supply, the MAX9516 is able to drive a 2VP-P
video signal into a 150Ω load. The MAX9516 has the abil-
ity to detect and report the presence of a video load and
reduce power consumption when the load is not present.
The MAX9516 can detect the presence of a video load
and report a change in load through the LOAD flag. This
feature helps reduce overall system power consumption
because the video encoder and the MAX9516 only need
to be turned on when a video load is connected. If no load
is connected, the MAX9516 is placed in an active-detect
mode and only consumes 31μW.
Maxim’s DirectDrive technology eliminates large output-
coupling capacitors and sets the output video black level
near ground. DirectDrive requires an integrated charge
pump and an internal linear regulator to create a clean
negative power supply so that the amplifier can pull the
sync below ground. The charge pump injects so little noise
into the video output that the picture is visibly flawless.
The MAX9516 features an internal reconstruction filter that
smoothes the steps and reduces the spikes on the video
signal from the video digital-to-analog converter (DAC).
The reconstruction filter typically has ±1dB passband flat-
ness of 7.5MHz, and 46dB (typ) attenuation at 27MHz.
The input of the MAX9516 can be directly connected to
the output of a video DAC. The MAX9516 also features a
transparent input sync-tip clamp, allowing AC-coupling of
input signals with different DC biases.
The MAX9516 has an internal fixed gain of 8. The input
full-scale video signal is nominally 0.25VP-P, and the out-
put full-scale video signal is nominally 2VP-P.
Applications
●Digital Still Cameras (DSC)
●Digital Video Cameras (DVC)
●Mobile Phones
●Portable Media Players (PMP)
●Security/CCTV Cameras
Features
●1.8V or 2.5V Single-Supply Operation
●Low Power Consumption (6mW Quiescent,
12mW Average)
●Video Load Detect
●Reconstruction Filter with 5.5MHz Passband
●DirectDrive Sets Video Output Black Level Near
Ground
●DC-Coupled Input/Output
●Transparent Input Sync-Tip Clamp
Pin Configuration appears at end of data sheet.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
19-0995; Rev 1; 5/14
Note: This device operates over the -40°C to +125°C operating
temperature range.
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART PIN-PACKAGE PKG CODE TOP
MARK
MAX9516ALB+T 10 FDFN-10 L1022+1 AAN
0V
2V
P-P
VIDEO
MAX9516
A
V
=
8V/V
LINEAR
REGULATOR
CHARGE
PUMP
LOAD
SENSE
TRANSPARENT
CLAMP
OUT
LOAD
IN
SHDN
250mV
P-P
VIDEO
LPF
SHUTDOWN
CIRCUIT
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplifier with Load Detect
Block Diagram
Ordering Information
EVALUATION KIT AVAILABLE
(Voltages with respect to GND.)
VDD ..........................................................................-0.3V to +3V
CPGND .................................................................-0.1V to +0.1V
IN .............................................................. -0.3V to (VDD + 0.3V)
OUT .................... (The greater of VSS and -1V) to (VDD + 0.3V)
SHDN ......................................................................-0.3V to +4V
C1P ........................................................... -0.3V to (VDD + 0.3V)
C1N ...........................................................(VSS - 0.3V) to +0.3V
VSS .........................................................................-3V to +0.3V
Duration of OUT Short Circuit to VDD,
GND, and VSS ....................................................... Continuous
Continuous Current
IN, SHDN, LOAD .......................................................... ±20mA
Continuous Power Dissipation (TA = +70°C)
10-Pin μDFN (derate 5mW/°C above +70°C) .............403mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
(VDD = SHDN = +1.8V, GND = 0V, OUT has RL = 150Ω connected to GND, C1 = C2 = 1μF, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at VDD = 1.8V, TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by PSRR 1.700 2.625 V
Supply Current IDD Amplier ON, SHDN
= VDD
Full operation mode,
VIN = 0mV (Note 2) 3.1 5.3 mA
Active-detect mode,
no load 3 µA
Shutdown Supply Current ISHDN SHDN = GND 0.01 10 µA
Output Load Detect Threshold RL to GND 200 Ω
Output Level IN = 80mV -85 +9 +85 mV
DC-COUPLED INPUT
Input Voltage Range Guaranteed by
output-voltage swing
1.7V ≤ VDD ≤ 2.625V 0 262.5
mV
2.375V ≤ VDD ≤ 2.625V 0 325
Input Current I
B
IN = 130mV 2 3.5 µA
Input Resistance R
IN
10mV ≤ IN ≤ 250mV 295 kΩ
AC-COUPLED INPUT
Sync-Tip Clamp Level V
CLP
C
IN
= 0.1µF -8 0 +11 mV
Input-Voltage Swing Guaranteed by
output-voltage swing
1.7V ≤ V
DD
≤ 2.625V 252.5
mV
P-P
2.375V ≤ V
DD
≤ 2.625V 325
Sync Crush Percentage reduction in sync pulse at output,
R
SOURCE
= 37.5Ω, C
IN
= 0.1µF 1.3 %
Input Clamping Current IN = 130mV 2 3.5 µA
Line Time Distortion CIN = 0.1µF 0.2 %
Minimum Input Source
Resistance 25 Ω
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
www.maximintegrated.com Maxim Integrated
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Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VDD = SHDN = +1.8V, GND = 0V, OUT has RL = 150Ω connected to GND, C1 = C2 = 1μF, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at VDD = 1.8V, TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
DC Voltage Gain A
V
Guaranteed by output-voltage swing
(Note 3) 7.84 8 8.16 V/V
Output-Voltage Swing
1.7V ≤ V
DD
≤ 2.625V
0 ≤ V
IN
≤ 262.5mV,
DC-coupled input 2.058 2.1 2.142
V
P-P
0 ≤ V
IN
≤ 252.5mV
P-P
,
AC-coupled input 1.979 2.02 2.061
2.375V ≤ V
DD
≤
2.625V 0 ≤ V
IN
≤ 325mV 2.548 2.6 2.652
Power-Supply Rejection Ratio 1.7V P V
DD
≤ 2.625V, measured between 75Ω
load resistors 48 58 dB
Shutdown Input Resistance 0V ≤ IN ≤ V
DD
, SHDN = GND 2.5 MΩ
Output Resistance R
OUT
OUT = 0V, -5mA ≤ I
LOAD
≤ +5mA 0.02 Ω
Shutdown Output Resistance 0V ≤ OUT ≤ V
DD
, SHDN = GND 10.0 MΩ
OUT Leakage Current SHDN = GND 1 µA
Output Short-Circuit Current Sourcing 81 mA
Sinking 45
AC CHARACTERISTICS
Standard-Denition
Reconstruction Filter
OUT = 2VP-P,
reference frequency
is 100kHz
±1dB passband atness 7.5 MHz
f = 5.5MHz -0.2
dBf = 8.5MHz -3.0
f = 27MHz -48.7
Differential Gain DG f = 3.58MHz 1.05 %
f = 4.43MHz 1.1
Differential Phase DP f = 3.58MHz 0.4
Degrees
f = 4.43MHz 0.45
Group-Delay Distortion 100kHz ≤ f ≤ 5MHz, OUT = 2V
P-P
16 ns
Peak Signal to RMS Noise 100kHz ≤ f ≤ 5MHz 64 dB
Power-Supply Rejection Ratio PSRR f = 100kHz, V
RIPPLE
= 100mV
P-P
54 dB
2T Pulse-to-Bar K Rating
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.1 K%
2T Pulse Response 2T = 200ns 0.3 K%
2T Bar Response
2T = 200ns, bar time is 18µs, the beginning
2.5% and the ending 2.5% of the bar time is
ignored
0.1 K%
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
www.maximintegrated.com Maxim Integrated
│
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Electrical Characteristics (continued)
(VDD = SHDN = +1.8V, GND = 0V, OUT has RL = 150Ω connected to GND, C1 = C2 = 1μF, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at VDD = 1.8V, TA = +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
Note 2: Supply current does not include current supplied to VOUT load.
Note 3: Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
(VDD = SHDN = 1.8V, GND = 0V, video output has RL = 150Ω connected to GND, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Nonlinearity 5-step staircase 0.2 %
Output Impedance f = 5MHz, IN = 80mV 7.5 Ω
V
OUT
-to-V
IN
Isolation SHDN = GND, f ≤ 5.5MHz -78 dB
V
IN
-to-V
OUT
Isolation SHDN = GND, f ≤ 5.5MHz -79 dB
CHARGE PUMP
Switching Frequency 325 625 1150 kHz
LOGIC SIGNALS
Logic-Low Threshold V
IL
SHDN, V
DD
= 1.7V to 2.625V 0.5 V
Logic-High Threshold V
IH
SHDN, V
DD
= 1.7V to 2.625V 1.4 V
Logic Input Current I
IL
, I
IH
SHDN 10 µA
Output High Voltage V
OH
LOAD, I
OH
= 3mA V
DD
- 0.4 V
Output Low Voltage V
OL
LOAD, I
OL
= 3mA 0.4 V
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9516 toc02
FREQUENCY (MHz)
GAIN (dB)
101
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
-3.0
0.1 100
VOUT = 100mVP-P
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9516 toc03
FREQUENCY (MHz)
GAIN (dB)
101
-80
-60
-40
-20
0
20
-100
0.1 100
VOUT = 2VP-P
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9516 toc01
FREQUENCY (MHz)
GAIN (dB)
101
-80
-60
-40
-20
0
20
-100
0.1 100
VOUT = 100mVP-P
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Electrical Characteristics (continued)
Typical Operating Characteristics
(VDD = SHDN = 1.8V, GND = 0V, video output has RL = 150Ω connected to GND, TA = +25°C, unless otherwise noted.)
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9516 toc04
FREQUENCY (MHz)
GAIN (dB)
101
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
-3.0
0.1 100
VOUT = 2VP-P
GROUP DELAY
vs. FREQUENCY
MAX9516 toc05
FREQUENCY (MHz)
DELAY (ns)
101
10
20
30
40
50
60
70
80
90
100
110
0
0.1 100
VOUT = 2VP-P
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9516 toc06
FREQUENCY (MHz)
PSSR (dB)
101
-80
-60
-40
-20
0
20
-100
0.1 100
VRIPPLE = 100mVP-P
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9516 toc07
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (mA)
1007550250-25
1.5
2.0
2.5
3.5
3.0
4.0
4.5
5.0
1.0
-50 125
VOLTAGE GAIN
vs. TEMPERATURE
MAX9516 toc08
TEMPERATURE (°C)
VOLTAGE GAIN (V/V)
1007550250-25
7.85
7.90
7.95
8.05
8.00
8.10
8.15
8.20
7.80
-50 125
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX9516 toc09
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
350300250200150100500-50
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-1.5
-100 400
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
Maxim Integrated
│
5
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Typical Operating Characteristics (continued)
(VDD = SHDN = 1.8V, GND = 0V, video output has RL = 150Ω connected to GND, TA = +25°C, unless otherwise noted.)
DIFFERENTIAL GAIN AND PHASE
MAX9516 toc10
DIFFERENTIAL
GAIN (%)
DIFFERENTIAL
PHASE (deg)
0.4
0.8
1.2
1.6
0
-0.4
0.8
0.4
0
-0.4
-0.8
-1.2
1.2
123 4 5 6 7
123 4 5 6 7
2T RESPONSE
MAX9516 toc11
100ns/div
50mV/div
IN
OUT
400mV/div
0V
0V
12.5T RESPONSE
MAX9516 toc12
400ns/div
50mV/div
400mV/div
IN
OUT
0V
0V
NTC-7 VIDEO TEST SIGNAL
MAX9516 toc13
10µs/div
100mV/div
800mV/div
IN
OUT
0V
0V
FIELD SQUARE-WAVE (AC-COUPLED)
MAX9516 toc14
2ms/div
100mV/div
800mV/div
IN
OUT
0V
0V
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
Maxim Integrated
│
6
www.maximintegrated.com
Typical Operating Characteristics (continued)
Detailed Description
The MAX9516 represents Maxim’s second-generation of
DirectDrive video amplifiers, which meet the requirements
of current and future portable equipment:
●1.8V operation. Engineers want to eliminate the 3.3V
supply in favor of lower supply voltages.
●Lower power consumption. The MAX9516 reduces
average power consumption by up to 75% com-
pared to the 3.3V first-generation devices (MAX9503/
MAX9505).
●Internal fixed gain of 8. As the supply voltages drop for
system chips on deep submicron processes, the video
DAC can no longer create a 1VP-P signal at its output,
and the gain of 2 found in the previous generation of
video filter amps is not enough.
●Active-detect mode reduces power consumption.
DirectDrive technology is necessary for a voltage-mode
amplifier to output a 2VP-P video signal from a 1.8V sup-
ply. The integrated inverting charge pump creates a nega-
tive supply that increases the output range and gives the
video amplifier enough headroom to drive a 2VP-P video
signal with a 150Ω load.
DirectDrive
Background
Integrated video filter amplifier circuits operate from a
single supply. The positive power supply usually creates
video output signals that are level-shifted above ground
to keep the signal within the linear range of the output
amplifier. For applications where the positive DC level is
not acceptable, a series capacitor can be inserted in the
output connection in an attempt to eliminate the positive
DC level shift. The series capacitor cannot truly level-shift
a video signal because the average level of the video var-
ies with picture content. The series capacitor biases the
video output signal around ground, but the actual level of
the video signal can vary significantly depending upon the
RC time constant and the picture content.
The series capacitor creates a highpass filter. Since the
lowest frequency in video is the frame rate, which can be
from 24Hz to 30Hz, the pole of the highpass filter should
ideally be an order of magnitude lower in frequency than
the frame rate. Therefore, the series capacitor must be
very large, typically from 220μF to 3000μF. For spac
constrained equipment, the series capacitor is unaccept-
able. Changing from a single-series capacitor to a SAG
network that requires two smaller capacitors only reduces
space and cost slightly.
The series capacitor in the usual output connection also
prevents damage to the output amplifier if the connector is
shorted to a supply or to ground. While the output connec-
tion of the MAX9516 does not have a series capacitor, the
MAX9516 will not be damaged if the connector is shorted to a
supply or to ground (see the Short-Circuit Protection section).
Video Amplier
If the full-scale video signal from a video DAC is 250mV,
the black level of the video signal created by the video
DAC is approximately 75mV. The MAX9516 shifts the
black level to near ground at the output so that the active
video is above ground and the sync is below ground. The
amplifier needs a negative supply for its output stage to
remain in its linear region when driving sync below ground.
PIN NAME FUNCTION
1 VSS Charge-Pump Negative Power Supply. Bypass with a 1µF capacitor to GND.
2 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to C1N.
3 CPGND Charge-Pump Ground
4 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to C1N.
5 VDD Positive Power Supply. Bypass with a 0.1µF capacitor to GND.
6 LOAD Load-Detect Output. LOAD goes high when an output video load is detected.
7 GND Ground
8 IN Video Input
9SHDN Active-Low Shutdown. Connect to VDD for normal operation.
10 OUT Video Output
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Pin Description
The MAX9516 has an integrated charge pump and linear
regulator to create a low-noise negative supply from the
positive supply voltage. The charge pump inverts the
positive supply to create a raw negative voltage that is
then fed into the linear regulator, which filters out the
charge-pump noise.
Comparison Between DirectDrive Output
and AC-Coupled Output
The actual level of the video signal varies less with a
DirectDrive output than an AC-coupled output. The aver-
age video signal level can change greatly depending
upon the picture content. With an AC-coupled output, the
average level will change according to the time constant
formed by the series capacitor and series resistance (usu-
ally 150Ω). For example, Figure 1 shows an AC-coupled
video signal alternating between a completely black
screen and a completely white screen. Notice the excur-
sion of the video signal as the screen changes.
With the DirectDrive amplifier, the black level is held at
ground. The video signal is constrained between -0.3V
and +0.7V. Figure 2 shows the video signal from a
DirectDrive amplifier with the same input signal as the
AC-coupled system.
Load Detection
The MAX9516 provides a video load detection feature.
The device enters active-detect mode when it is enabled
(SHDN = VDD). Every 128ms, the part checks for a load
by connecting a 7.5kΩ pullup resistor to the video output
for 1ms. If the video output is pulled up during the test,
then no load is present and LOAD is low. If the video
output stays low during the test, then a load is connected
and LOAD goes high. The state of LOAD is latched dur-
ing the sleep time between sense pulses. All load-detect
changes are deglitched over a nominal 128ms period.
The status of the video load must remain constant during
this deglitch period for LOAD to change state.
If a load is detected, the part enters the full operation
mode and the amplifier, filter, and sync-tip clamp turn on.
The part then continually checks if the load is present by
sensing the sinking load current. Therefore, a black-burst
signal (or output signal < 0V) is required to maintain the
detected load status. If the load remains present, the
LOAD pin remains high. If the load is removed, LOAD
goes low and the part goes back to the active-detect
mode in which power consumption is typically 31μW.
Video Reconstruction Filter
The MAX9516 includes an internal five-pole, Butterworth
lowpass filter to condition the video signal. The recon-
struction filter smoothes the steps and reduces the spikes
created whenever the DAC output changes value. In the
frequency domain, the steps and spikes cause images
of the video signal to appear at multiples of the sam-
pling clock frequency. The reconstruction filter typically
has ±1dB passband flatness of 7.5MHz and 46dB (typ)
attenuation at 27MHz.
Transparent Sync-Tip Input Clamp
The MAX9516 contains an integrated, transparent sync-
tip clamp. When using a DC-coupled input, the sync-tip
clamp does not affect the input signal, as long as it
remains above ground. When using an AC-coupled input,
Figure 1. AC-Coupled Output
Figure 2. DirectDrive Output
INPUT
500mV/div
OUTPUT
1V/div
2ms/div
0V
0V
INPUT
500mV/div
OUTPUT
500mV/div
2ms/div
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
www.maximintegrated.com Maxim Integrated
│
8
the sync-tip clamp automatically clamps the input signal
to ground, preventing it from going lower. A small current
of 2μA pulls down on the input to prevent an AC-coupled
signal from drifting outside the input range of the part.
Using an AC-coupled input will result in some additional-
variation of the black level at the output. Applying a volt-
age above ground to the input pin of the device always
produces the same output voltage, regardless of whether
the input is DC- or AC-coupled. However, since the sync-
tip clamp level (VCLP) can vary over a small range, the
video black level at the output of the device when using
an AC-coupled input can vary by an additional amount
equal to the VCLP multiplied by the DC voltage gain (AV).
Short-Circuit Protection
In Figure 7, the MAX9516 includes a 75Ω back-termina-
tion resistor that limits short-circuit current if an external
short is applied to the video output. The MAX9516 also
features internal output short-circuit protection to prevent
device damage in prototyping and applications where the
amplifier output can be directly shorted.
Shutdown
The MAX9516 features a low-power shutdown mode for
battery-powered/portable applications. Shutdown reduc-
es the quiescent current to less than 10nA. Connecting
SHDN to ground (GND) disables the output and places
the MAX9516 into a low-power shutdown mode. In shut-
down mode, the sync-tip clamp, filter, amplifier, charge
pump, and linear regulator are turned off and the video
output is high impedance.
Applications Information
Power Consumption
The quiescent power consumption and average power
consumption of the MAX9516 is remarkably low because
of the 1.8V operation and the DirectDrive technology.
Quiescent power consumption (PQ) is the power con-
sumed by the internal circuitry of the MAX9516. The
formula for calculating PQ is below.
PQ = PTOTAL - PLOAD
PTOTAL is the total power drawn from the supply voltage,
and PLOAD is the power consumed by the load attached
to OUT. For the MAX9516, the quiescent power consump-
tion is typically 6mW.
Average power consumption, which is representative of
the power consumed in a real application, is the total
power drawn from the supply voltage for a MAX9516
driving a 150Ω load to ground with a 50% flat field. Under
such conditions, the average power consumption for the
MAX9516 is 12mW. Table 1 shows the power consump-
tion with different video signals. The supply voltage is
1.8V. OUT drives a 150Ω load to ground.
Notice that the two extremes in power consumption occur
with a video signal that is all black and a video signal that
is all white. The power consumption with 75% color bars
and a 50% flat field lies in between the extremes.
Interfacing to Video DACs that Produce
Video Signals Larger than 0.25VP-P
Devices designed to generate 1VP-P video signals at the
output of the video DAC can still work with the MAX9516.
Most video DACs source current into a ground-referenced
resistor, which converts the current into a voltage. Figure
3 shows a video DAC that creates a video signal from 0
to 1V across a 150Ω resistor. The following video filter
amplifier has a gain of 2V/V so that the output is 2VP-P.
The MAX9516 expects input signals that are 0.25VP-P
nominally. The same video DAC can be made to work
with the MAX9516 by scaling down the 150Ω resistor to a
37.5Ω resistor, as shown in Figure 4. The 37.5Ω resistor
is one-quarter of the 150Ω resistor, resulting in a video
signal that is one-quarter the amplitude.
Figure 3. Video DAC generates a 1VP-P signal across a 150Ω
resistor connected to ground.
Table 1. Power Consumption of MAX9516
with Different Video Signals
VIDEO SIGNAL MAX9516 POWER
CONSUMPTION (mW)
All Black Screen 6.7
All White Screen 18.2
75% Color Bars 11.6
50% Flat Field 11.7
150Ω
0 TO 1V
LPF
DAC
IMAGE
PROCESSOR
ASIC
75Ω
2V/V
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
www.maximintegrated.com Maxim Integrated
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Anti-Alias Filter
The MAX9516 provides anti-alias filtering with buffer-
ing before an analog-to-digital converter (ADC), which
is present in an NTSC/PAL video decoder, for example.
Figure 5 shows an example application circuit. An exter-
nal composite video signal is applied to VIDIN, which is
terminated with a total of 74Ω (56Ω and 18Ω resistors)
to ground. The signal is attenuated by four, and then
AC-coupled to IN. The normal 1VP-P video signal must
be attenuated because with a 1.8V supply, the MAX9516
can handle only a video signal of approximately 0.25VP-P
at IN. AC-couple the video signal to IN because the DC
level of an external video signal is usually not well speci-
fied, although it is reasonable to expect that the signal is
between -2V and +2V. The 10Ω series resistor increases
the equivalent source resistance to about 25Ω, which is
the minimum necessary for a video source to drive the
internal sync-tip clamp.
For external video signals larger than 1VP-P, operate the
MAX9516 from a 2.5V supply so that IN can accommo-
date a 0.325VP-P video signal, which is equivalent to a
1.3VP-P video signal at VIDIN.
Figure 4. Video DAC Generates a 0.25VP-P Signal Across a
37.5Ω Resistor Connected to Ground
Figure 5. MAX9516 Used as an Anti-Alias Filter with Buffer
37.5Ω
0 TO 0.25V
LPF
DAC
IMAGE
PROCESSOR
ASIC
MAX9516
75Ω
8V/V
MAX9516
LOAD SENSE
V
DD
VIDIN
VIDEO
AMPLIFIER
SHUTDOWN
CIRCUIT
SHDN
DC
LEVEL SHIFT
CLAMP
1.8V VDD
OUT
56Ω
18Ω
10Ω
75Ω
75Ω
LOAD
VIDEO
DECODER
CHARGE PUMP
LINEAR
REGULATOR
C1
1µF
C2
1µF
0.1µF
0.1µF
LPF
GND CPGND C1P C1N VSS
IN
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Video Source with a Positive DC Bias
In some applications, the video source generates a signal
with a positive DC voltage bias, i.e., the sync tip of the
signal is well above ground. Figure 6 shows an example
in which the outputs of the luma (Y) DAC and the chroma
(C) DAC are connected together. Since the DACs are
current mode, the output currents sum together into the
resistor, which converts the resulting current into a volt-
age representing a composite video signal.
If the chroma DAC has an independent output resistor
to ground, then the chroma signal, which is a carrier at
3.58MHz for NTSC or at 4.43MHz for PAL, has a posi-
tive DC bias to keep the signal above ground at all times.
If the luma DAC has an independent output resistor to
ground, then the luma signal usually does not have a pos-
itive DC bias, and the sync tip is at approximately ground.
When the chroma and luma signals are added together,
the resulting composite video signal still has a positive DC
bias. Therefore, the signal must be AC-coupled into the
MAX9516 because the composite video signal is above
the nominal, DC-coupled 0V to 0.25V input range.
Video Signal Routing
Minimize the length of the PCB trace between the output
of the video DAC and the input of the MAX9516 to reduce
coupling of external noise into the video signal. If pos-
sible, shield the PCB trace.
Figure 6. Luma (Y) and Chroma (C) Signals Added Together to Create Composite Video Signal (Which is AC-Coupled Into the
MAX9516)
MAX9516
LOAD SENSE
V
DD
VIDEO
AMPLIFIER
LUMA (Y)
CHROMA (C)
SHDN
IN
DC
LEVEL SHIFT
CLAMP
1.8V VDD
OUT 75Ω
75Ω
LOAD
CHARGE PUMP
LINEAR
REGULATOR
C1
1µF
C2
1µF
0.1µF
0.1µF
LPF
GND CPGND C1P C1N VSS
DAC
DAC
VIDEO
ASIC
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Power-Supply Bypassing
and Ground Management
The MAX9516 operates from a 1.7V to 2.625V single
supply and requires proper layout and bypassing. For the
best performance, place the components as close to the
device as possible.
Proper grounding improves performance and prevents
any switching noise from coupling into the video signal.
Bypass the analog supply (VDD) with a 0.1μF capacitor to
GND, placed as close to the device as possible. Bypass
VSS with a 1μF capacitor to GND as close to the device
as possible. The total system bypass capacitance on
VDD should be at least 10μF or ten times the capacitance
between C1P and C1N.
Using a Digital Supply
The MAX9516 was designed to operate from noisy digital
supplies. The high PSRR (54dB at 100kHz) allows the
MAX9516 to reject the noise from the digital power sup-
plies (see the Typical Operating Characteristics). If the
digital power supply is very noisy and stripes appear on
the television screen, increase the supply bypass capaci-
tance. An additional, smaller capacitor in parallel with the
main bypass capacitor can reduce digital supply noise
because the smaller capacitor has lower equivalent series
resistance (ESR) and equivalent series inductance (ESL).
Figure 7. DC-Coupled Input
MAX9516
LOAD SENSE
V
DD
VIDEO
AMPLIFIER
SHDN
IN
DC
LEVEL SHIFT
TRANSPARENT
CLAMP
1.8V V
DD
OUT
LOAD
CHARGE PUMP
LINEAR
REGULATOR
C1
1µF
C2
1µF
0.1µF
LPF
GND CPGND C1P C1N V
SS
DAC
VIDEO
ASIC
75Ω
75Ω
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Typical Operating Circuits
Figure 8. AC-Coupled Input
MAX9516
LOAD SENSE
V
DD
VIDEO
AMPLIFIER
SHDN
IN
DC
LEVEL SHIFT
CLAMP
1.8V V
DD
OUT
LOAD
CHARGE PUMP
LINEAR
REGULATOR
C1
1µF
C2
1µF
0.1µF
0.1µF
LPF
GND CPGND C1P C1N V
SS
V
DD
DAC
VIDEO
ASIC
1 2 3
10
+
9 8
4 5
7 6
OUT IN LOADSHDN
VSS VDD
CPGNDC1N
MAX9516
µDFN
TOP VIEW
GND
C1P
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
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Typical Operating Circuits (continued)
Pin Conguration Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE OUTLINE NO.
LAND
PATTERN
NO.
10 µDFN L1022+1 21-0164 90-0006
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX9516 1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplier with Load Detect
© 2014 Maxim Integrated Products, Inc.
│
14
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/07 Initial release —
1 5/14 Removed automotive reference from Applications section 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
