MAX9510 [MAXIM]
1.8V, Ultra-Low Power, DirectDrive Video Filter Amplifiers;
| 型号： | MAX9510 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1.8V, Ultra-Low Power, DirectDrive Video Filter Amplifiers |
| 文件： | 总15页 (文件大小：1876K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
General Description
Features
Operating from a 1.8V single power supply, the MAX9509/
MAX9510 amplify standard-definition video signals and
only consume 5.8mW quiescent power and 11.7mW aver-
age power. The MAX9509/MAX9510 leverage Maxim’s
● 5.8mW Quiescent Power Consumption
● 11.7mW Average Power Consumption
● 1.8V or 2.5V Single-Supply Operation
®
DirectDrive technology to generate a clean, internal neg-
● Reconstruction Filter with 8.1MHz Passband and
ative supply. Combining the internal negative power sup-
ply with the external positive 1.8V supply, the MAX9509/
MAX9510 are able to drive a 2V
46dB Attenuation at 27MHz (MAX9509)
● DirectDrive Sets Video Output Black Level near
video signal into a
P-P
Ground
150Ω load.
● DC-Coupled Input/Output
Besides increasing the output voltage range, 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 little noise into the video
output, making the picture visibly flawless.
● Transparent Input Sync-Tip Clamp
● Internal Fixed Gain of 8
● 10nA Shutdown Supply Current
Applications
● Digital Still Cameras
(DSC)
● Digital Video Cameras
(DVC)
● Portable Media Players
(PMP)
● Mobile Phones
● Security/CCTV
Cameras
The MAX9509/MAX9510 are designed to operate from
the 1.8V digital power supply. The high power-supply
rejection ratio (49dB at 100kHz) allows the MAX9509/
MAX9510 to reject the noise from the digital power supply.
The MAX9509 features an internal reconstruction filter
that smoothes the steps and reduces the spikes on
the video signal from the video digital-to-analog con-
verter (DAC). The reconstruction filter typically has ±1dB
passband flatness of 8.1MHz and 46dB attenuation at
27MHz. The large-signal, ±1dB passband flatness of the
MAX9510 video amplifier is typically 8.4MHz, and the
large signal -3dB frequency is typically 11.4MHz.
Block Diagram
IN
OUT
A
8V/V
=
V
LPF*
TRANSPARENT
CLAMP
250mV VIDEO
P-P
2V VIDEO
P-P
LINEAR
REGULATOR
The input of the MAX9509/MAX9510 can be directly
connected to the output of a video DAC. The MAX9509/
MAX9510 also feature a transparent input sync-tip clamp,
allowing AC-coupling of input signals with different DC
biases. The MAX9509/MAX9510 have an internal fixed
gain of 8. The input full-scale video signal is nominally
0V
MAX9509
MAX9510
SHDN
CHARGE
PUMP
*FOR MAX9509
0.25V , and the output full-scale video signal is nomi-
P-P
nally 2V . The devices operate from a 1.8V or 2.5V
P-P
μMAX and DirectDrive are registered trademarks of Maxim
Integrated Products, Inc.
single supply and feature a 10nA low-power shutdown
mode. The MAX9509 is offered in an 8-pin TDFN package
Pin Configurations appears at end of data sheet.
®
and the MAX9510 is offered in an 8-pin μMAX package.
Ordering Information
PART
RECONSTRUCTION FILTER
PIN-PACKAGE
8 TDFN-EP*
8 µMAX-8
TOP MARK
MAX9509ATA+T
MAX9510AUA+T
Yes
No
AAZ
—
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes lead(PB)-free/RoHS-compliant package.
*EP = Exposed pad.
19-0727; Rev 2; 5/14
MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Absolute Maximum Ratings
(Voltages with respect to GND.)
Continuous Current
V
..........................................................................-0.3V to +3V
IN, SHDN...........................................................................±20mA
DD
IN................................................................-0.3V to (V
OUT.......................(The greater of V and -1V) to (V
SHDN........................................................................-0.3V to +4V
C1P ............................................................-0.3V to (V + 0.3V)
+ 0.3V)
+ 0.3V)
Continuous Power Dissipation (T = +70°C)
DD
A
8-Pin TDFN (derate 11.9mW/°C above +70°C).........953.5mW
8-Pin μMAX (derate 4.5mW/°C above +70°C).............362mW
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
SS
DD
DD
C1N ............................................................(V - 0.3V) to +0.3V
SS
V
...........................................................................-3V to +0.3V
SS
Duration of OUT Short Circuit to VDD,
GND, and V ........................................................Continuous
SS
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
(V
= SHDN = 1.8V, GND = 0V, OUT has R = 150Ω connected to GND, C1 = C2 = 1μF, T = T
to T
, unless otherwise noted.
DD
L
A
MIN
MAX
Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
2.625
5.3
UNITS
Supply Voltage Range
V
Guaranteed by PSRR
1.700
V
DD
MAX9509
MAX9510
3.1
2.9
Supply Current
I
No load
mA
DD
4.9
Shutdown Supply Current
Output Level
I
SHDN = GND
0.01
+5
10
µA
SHDN
IN = 80mV
-75
+75
mV
DC-COUPLED INPUT
1.7V ≤ V
≤ 2.625V
0
0
262.5
325
Guaranteed by output
voltage swing
DD
Input Voltage Range
mV
2.375V ≤ V
≤ 2.625V
DD
Input Current
I
IN = 130mV
2
3.2
µA
B
Input Resistance
R
10mV ≤ IN ≤ 250mV
280
kΩ
IN
AC-COUPLED INPUT
Sync-Tip Clamp Level
V
C
= 0.1µF
-8
0
+11
252.5
325
mV
CLP
IN
1.7V ≤ V
≤ 2.625V
Guaranteed by output
voltage swing
DD
Input-Voltage Swing
Sync Crush
mV
P-P
2.375V ≤ V
≤ 2.625V
DD
Percentage reduction in sync pulse at output,
= 37.5Ω, C = 0.1µF
1.6
%
R
SOURCE
IN
Input Clamping Current
Line Time Distortion
IN = 130mV
= 0.1µF
2
3.2
µA
%
C
0.2
IN
Minimum Input Source
Resistance
25
Ω
Maxim Integrated
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Electrical Characteristics (continued)
(V
= SHDN = 1.8V, GND = 0V, OUT has R = 150Ω connected to GND, C1 = C2 = 1μF, T = T
to T
, unless otherwise noted.
DD
L
A
MIN
MAX
Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
DC CHARACTERISTICS
DC Voltage Gain
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
AV
Guaranteed by output voltage swing (Note 2)
7.84
7.95
2.1
8.16
V/V
0V ≤ V ≤ 262.5mV,
IN
2.058
2.142
DC-coupled input
1.7V ≤ V
≤ 2.625V
DD
0V ≤ V ≤ 252.5mV
,
IN
P-P
Output Voltage Swing
1.979
2.548
46
2.02
2.6
60
2.061
2.652
V
P-P
AC-coupled input
2.375V ≤ VDD ≤
2.625V
0V ≤ V ≤ 325mV
IN
Power-Supply Rejection
Ratio
1.7V ≤ V
≤ 2.625V, measured between 75Ω
DD
PSRR
dB
load resistors
Shutdown Input
Resistance
0V ≤ IN ≤ V , SHDN = GND
25
0.1
32
MΩ
Ω
DD
Output Resistance
R
OUT = 0V, -5mA ≤ I
≤ +5mA
OUT
LOAD
Shutdown Output
Resistance
0V ≤ OUT ≤ V , SHDN = GND
MΩ
µA
DD
OUT Leakage Current
SHDN = GND
Sourcing
1
82
32
Output Short-Circuit
Current
mA
Sinking
AC CHARACTERISTICS (MAX9509)
±1dB passband flatness
f = 5.5MHz
8.1
+0.15
-3
MHz
dB
OUT = 2V
reference frequency is
100kHz
,
P-P
Standard-Definition
Reconstruction Filter
f = 10MHz
f = 27MHz
-46
f = 3.58MHz
f = 4.43MHz
f = 3.58MHz
f = 4.43MHz
1.04
1.16
0.54
0.52
14
Differential Gain
DG
DP
%
Differential Phase
Degrees
Group-Delay Distortion
100kHz ≤ f ≤ 5MHz, OUT = 2V
100kHz ≤ f ≤ 5MHz
ns
P-P
Peak Signal to RMS Noise
64
dB
Power-Supply Rejection
Ratio
PSRR
f = 100kHz, 100mV
49
dB
P-P
2T = 200ns, bar time is 18µs, the beginning 2.5%
and the ending 2.5% of the bar time are ignored
2T Pulse-to-Bar K Rating
2T Pulse Response
2T Bar Response
0.1
0.3
0.1
K%
K%
K%
2T = 200ns
2T = 200ns, bar time is 18µs, the beginning 2.5%
and the ending 2.5% of the bar time are ignored
Nonlinearity
5-step staircase
0.2
6.4
%
Output Impedance
f = 5MHz, IN = 80mV
Ω
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Electrical Characteristics (continued)
(V
= SHDN = 1.8V, GND = 0V, OUT has R = 150Ω connected to GND, C1 = C2 = 1μF, T = T
to T
, unless otherwise noted.
DD
L
A
MIN
MAX
Typical values are at T = +25°C.) (Note 1)
A
PARAMETER
OUT-to-IN Isolation
IN-to-OUT Isolation
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
dB
SHDN = GND, f ≤ 5.5MHz
SHDN = GND, f ≤ 5.5MHz
102
99
dB
AC CHARACTERISTICS (MAX9510)
Small-Signal -3dB
Bandwidth
OUT = 100mV
42.1
11.4
MHz
MHz
P-P
Large-Signal -3dB
Bandwidth
OUT = 2V
P-P
Small-Signal 1dB Flatness
Large-Signal 1dB Flatness
Slew Rate
OUT = 100mV
OUT = 2V
36.1
8.4
MHz
MHz
V/µs
ns
P-P
P-P
OUT = 2V step
OUT = 2V step
f = 3.58MHz
43
Settling Time to 0.1%
124
0.70
0.93
0.69
0.83
6
Differential Gain
DG
DP
%
f = 4.43MHz
f = 3.58MHz
Differential Phase
Degrees
f = 4.43MHz
Group-Delay Distortion
100kHz ≤ f ≤ 5MHz, OUT = 2V
ns
P-P
Peak Signal to RMS Noise
100kHz ≤ f ≤ 5MHz
67
dB
Power-Supply Rejection
Ratio
PSRR
f = 100kHz, 100mV
45
dB
P-P
2T = 200ns, bar time is 18µs, the beginning 2.5%
and the ending 2.5% of the bar time are ignored
2T Pulse-to-Bar K Rating
2T Pulse Response
2T Bar Response
0.2
0.2
0.1
K%
K%
K%
2T = 200ns
2T = 200ns, bar time is 18µs, the beginning 2.5%
and the ending 2.5% of the bar time are ignored
Nonlinearity
5-step staircase
0.1
7.3
98
%
Ω
Output Impedance
OUT-to-IN Isolation
IN-to-OUT Isolation
CHARGE PUMP
Switching Frequency
SHDN INPUT
f = 5MHz, IN = 80mV
SHDN = GND, f ≤ 5MHz
SHDN = GND, f ≤ 5MHz
dB
dB
94
325
1.4
625
1150
0.5
kHz
Logic-Low Threshold
Logic-High Threshold
Logic Input Current
V
V
V
= 1.7V to 2.625V
= 1.7V to 2.625V
V
V
IL
DD
DD
V
IH
I , I
10
µA
IL IH
Note 1: All devices are 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.
A
Note 2: Voltage gain (A ) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
V
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Typical Operating Characteristics
(V
noted.)
= SHDN = 1.8V, GND = 0V, DC–coupled input, video output has R = 150Ω connected to GND, T = +25°C, unless otherwise
DD
L
A
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
20
0
2
1
20
0
MAX9510
MAX9509
MAX9510
-20
-40
-60
-80
-100
MAX9510
-20
-40
-60
-80
-100
0
MAX9509
-1
-2
-3
MAX9509
V
= 100mV
P-P
OUT
V
= 100mV
P-P
V
= 2V
P-P
OUT
OUT
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
100M
100k
1M
10M
FREQUENCY (Hz)
100M
1G
FREQUENCY (Hz)
GROUP DELAY vs. FREQUENCY
(MAX9509)
GROUP DELAY vs. FREQUENCY
(MAX9510)
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
2
1
100
90
80
70
60
50
40
30
20
10
0
40
32
24
16
8
MAX9509
V
OUT
= 2V
P-P
0
MAX9510
-1
-2
-3
V
OUT
= 100mV
10M
P-P
V
OUT
= 2V
P-P
0
100k
1M
10M
100M
100k
1M
10M
100M
100k
1M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
0
-20
-40
-60
-80
4.0
3.5
3.0
2.5
2.0
MAX9510
MAX9509
MAX9510
MAX9509
10k
100k
1M
10M
100M
-50 -25
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Typical Operating Characteristics (continued)
(V
noted.)
= SHDN = 1.8V, GND = 0V, DC–coupled input, video output has R = 150Ω connected to GND, T = +25°C, unless otherwise
DD
L
A
VOLTAGE GAIN
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
DIFFERENTIAL GAIN AND PHASE
(MAX9509)
8.20
8.15
8.10
8.05
8.00
7.95
7.90
1.6
2.0
1.5
1.0
0.5
0
FREQUENCY = 3.58MHz
1.2
0.8
0.4
0
IN = 71mV
P-P
-0.4
104
DC INPUT LEVEL (mV)
71
136
168
200
232
0.8
0.6
-0.5
-1.0
-1.5
0.4
0.2
0
7.85
7.80
-0.2
-50 -25
0
25
50
75 100 125
-100 -50
0
50 100 150 200 250 300 350 400
INPUT VOLTAGE (mV)
104
DC INPUT LEVEL (mV)
71
136
168
200
232
TEMPERATURE (°C)
DIFFERENTIAL GAIN AND PHASE
(MAX9509)
DIFFERENTIAL GAIN AND PHASE
(MAX9510)
DIFFERENTIAL GAIN AND PHASE
(MAX9510)
1.6
1.6
1.6
FREQUENCY = 4.43MHz
FREQUENCY = 4.43MHz
FREQUENCY = 3.58MHz
1.2
0.8
0.4
0
1.2
0.8
0.4
0
1.2
0.8
0.4
0
IN = 71mV
P-P
IN = 71mV
P-P
IN = 71mV
P-P
-0.4
-0.4
-0.4
104
DC INPUT LEVEL (mV)
71
136
168
200
232
104
DC INPUT LEVEL (mV)
71
104
136
168
200
232
71
136
168
200
232
DC INPUT LEVEL (mV)
0.8
0.6
0.8
0.6
0.8
0.6
0.4
0.2
0
0.4
0.2
0
0.4
0.2
0
-0.2
-0.2
-0.2
104
71
136
168
200
232
104
DC INPUT LEVEL (mV)
71
104
136
168
200
232
71
136
168
200
232
DC INPUT LEVEL (mV)
DC INPUT LEVEL (mV)
2T RESPONSE
12.5T RESPONSE
MAX9509/10 toc15
MAX9509/10 toc16
IN
IN
100mV/div
100mV/div
0V
0V
OUT
500mV/div
OUT
500mV/div
0V
0V
200ns/div
400ns/div
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Typical Operating Characteristics (continued)
(V
noted.)
= SHDN = 1.8V, GND = 0V, DC–coupled input, video output has R = 150Ω connected to GND, T = +25°C, unless otherwise
DD
L
A
OUTPUT RESPONSE
TO NTC-7 VIDEO TEST SIGNAL
PAL MULTIBURST RESPONSE
PAL COLOR BARS
MAX9509/10 toc19
MAX9509/10 toc17
MAX9509/10 toc18
IN
IN
IN
100mV/div
100mV/div
100mV/div
0V
0V
0V
OUT
500mV/div
OUT
1V/div
OUT
1V/div
0V
0V
0V
10µs/div
10µs/div
10µs/div
FIELD SQUARE-WAVE RESPONSE
SMALL-SIGNAL PULSE RESPONSE
(AC-COUPLED INPUT)
(MAX9510)
MAX9509/10 toc20
MAX9509/10 toc21
IN
INPUT
6.25mV/div
100mV/div
125mV
360mV
0V
OUT
500mV/div
OUTPUT
50mV/div
0V
200ns/div
2ms/div
LARGE-SIGNAL PULSE RESPONSE
(MAX9510)
ENABLE RESPONSE
DISABLE RESPONSE
MAX9509/10 toc24
MAX9509/10 toc22
MAX9509/10 toc23
IN = 0V
IN = 0V
SHDN
SHDN
0V
0V
1V/div
0V
0V
INPUT
125mV/div
1V/div
125mV
360mV
OUT
250mV/div
OUT
250mV/div
OUTPUT
1V/div
V
V
SS
SS
1V/div
1V/div
200ns/div
100µs/div
100µs/div
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Pin Description
PIN
NAME
FUNCTION
MAX9509
MAX9510
1
1
V
Charge-Pump Negative Power Supply. Bypass with a 1µF capacitor to GND.
SS
Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor from C1P to
C1N.
2
3
4
2
3
4
C1N
GND
C1P
Ground
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor from C1P to
C1N.
5
6
5
6
V
Positive Power Supply. Bypass with a 0.1µF capacitor to GND.
Video Input
DD
IN
SHDN
OUT
EP
7
7
Active-Low Shutdown. Connect to V
Video Output
for normal operation.
DD
8
8
EP
—
Exposed Paddle. EP is internally connected to GND. Connect EP to GND.
to keep the signal within the linear range of the output
amplifier. For applications where the positive DC level is
Detailed Description
The MAX9509/MAX9510 represent Maxim’s second gen-
eration of DirectDrive video amplifiers that meet the
requirements of current and future portable equipment:
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.
•
1.8V operation. Engineers want to eliminate the 3.3V
supply in favor of lower supply voltages.
•
Lower power consumption. The MAX9509/MAX9510
reduce average power consumption by up to 75%
compared to the 3.3V first generation (MAX9503/
MAX9505).
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 spacecon-
strained equipment, the series capacitor is unacceptable.
Changing from a single series capacitor to a SAG network
that requires two smaller capacitors only reduces space
and cost slightly.
•
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 1V
and the gain of 2 found in the previous generation of
video filter amplifiers is not enough.
signal at its output,
P-P
DirectDrive technology is necessary for a voltage mode
amplifier to output a 2V video signal from a 1.8V sup-
P-P
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 2V
signal with a 150Ω load.
video
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 con-
nection of the MAX9509/MAX9510 does not have a series
capacitor, the MAX9509/MAX9510 will not be damaged if
the connector is shorted to a supply or to ground (see the
Short-Circuit Protection section).
P-P
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
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Video Amplifier
Video Reconstruction Filter (MAX9509)
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 MAX9509/MAX9510
shift 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 out-
put stage to remain in its linear region when driving sync
below ground.
The MAX9509 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 sampling
clock frequency. The reconstruction filter typically has
±1dB passband flatness of 8.1MHz and 46dB attenuation
at 27MHz.
The MAX9509/MAX9510 have 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 volt-
age that is then fed into the linear regulator filtering out
the charge-pump noise.
Transparent Sync-Tip Clamp
The MAX9509/MAX9510 contain an integrated, transpar-
ent 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, the transparent 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.
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.
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 (V
) can vary over a small range, the
CLP
video black level at the output of the device when using
an AC-coupled input can vary by an additional amount
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.
equal to the V
multiplied by the DC Voltage Gain (A ).
CLP
V
INPUT
INPUT
0V
0V
OUTPUT
OUTPUT
2ms/div
2ms/div
Figure 1. AC-Coupled Outputlayout.
Figure 2. DirectDrive Output
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Short-Circuit Protection
Interfacing to Video DACs that Produce Video
Signals Larger than 0.25V
P-P
Devices designed to generate 1V
The MAX9509/MAX9510 Functional Diagram/Typical
Application Circuit includes a 75Ω back-termination resis-
tor that limits short-circuit current if an external short is
applied to the video output. The MAX9509/MAX9510 also
feature internal output short-circuit protection to prevent
device damage in prototyping and applications where the
amplifier output can be directly shorted.
video signals at the
P-P
output of the video DAC can still work with the MAX9509/
MAX9510. 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
Shutdown
the output is 2V
.
P-P
The MAX9509/MAX9510 feature a low-power shutdown
mode for battery-powered/portable applications. Shutdown
reducesthequiescentcurrenttolessthan10nA. Connecting
SHDN to ground (GND) disables the output and places the
MAX9509/MAX9510 into a lowpower shutdown mode.
In shutdown mode, the sync-tip clamp, filter (MAX9509),
amplifier, charge pump, and linear regulator are turned off
and the video output is high impedance.
The MAX9509/MAX9510 expect input signals that are
0.25V nominally. The same video DAC can be made
to work with the MAX9509/MAX9510 by scaling down the
150Ω resistor to a 37.5Ω resistor, as shown in Figure 4.
The 37.5Ω resistor is 1/4 the size of the 150Ω resistor,
resulting in a video signal that is 1/4 the amplitude.
P-P
IMAGE
PROCESSOR
ASIC
Applications Information
Power Consumption
The quiescent power consumption and average power
consumption of the MAX9509/MAX9510 are remarkably
low because of 1.8V operation and DirectDrive technol-
ogy. Quiescent power consumption is defined when the
MAX9509/MAX9510 are operating without load. In this
case, the MAX9509/MAX9510 consume approximately
5.8mW. Average power consumption, which is defined
when the MAX9509/MAX9510 drive a 150Ω load to
ground with a 50% flat field, is about 11.7mW. Table 1
shows the power consumption with different video sig-
nals. The supply voltage is 1.8V. OUT drives a 150Ω load
to ground.
75Ω
0 TO 1V
2V
P-P
DAC
2V/V
LPF
150Ω
Figure 3. The video DAC generates a 1V
150Ω resistor connected to ground.
signal across a
P-P
IMAGE
PROCESSOR
ASIC
Table 1. Power Consumption of MAX9509/
MAX9510 with Different Video Signals
MAX9509
MAX9510
75Ω
0 TO 0.25V
2V
P-P
MAX9509 Power
Consumption (mW) Consumption (mW)
MAX9510 Power
DAC
8V/V
LPF*
Video Signal
37.5Ω
All Black Screen
All White Screen
75% Color Bars
50% Flat Field
6.7
6.2
18.2
11.6
11.7
17.9
11.0
11.3
*FOR MAX9509 ONLY.
Figure 4. The video DAC generates a 0.25V
37.5Ω resistor connected to ground.
signal across a
P-P
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 50% flat field lies in between the extremes.
Maxim Integrated
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
AC-couple the video signal to IN because the DC level
of an external video signal is usually not well specified,
although it is reasonable to expect that the signal is
between -2V and +2V. The 10Ω series resistor increases
the equivalent source resistance to approximately 25Ω,
which is the minimum necessary for a video source to
drive the internal sync-tip clamp.
Anti-Alias Filter
The MAX9509 can also provide anti-alias filtering with a
buffer before an ADC, which would be present in a NTSC/
PAL video decoder, for example. Figure 5 shows an
example application circuit. An external 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
For external video signals larger than 1V , operate the
P-P
normal 1V
video signal must be attenuated because
MAX9509 from a 2.5V supply so that IN can accommo-
P-P
with a 1.8V supply, the MAX9509 can only handle a video
date a 0.325V
video signal, which is equivalent to a
P-P
signal of approximately 0.25V
at IN.
1.3V
video signal at VIDIN.
P-P
P-P
MAX9509
V
DD
V
DD
SHDN
VIDIN
SHUTDOWN
CIRCUIT
56Ω
0.1µF
= 1.8V
10Ω
75Ω
IN
VIDEO
DECODER
OUT
A
V
= 8V/V
LPF
CLAMP
18Ω
75Ω
V
DD
DC-LEVEL
SHIFT
V
DD
LINEAR
REGULATOR
CHARGE PUMP
C3
0.1µF
GND
C1P
C1N
V
SS
C2
1µF
C1
1µF
Figure 5. MAX9509 Used as an Anti-Alias Filter with Buffer
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
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 MAX9509/MAX9510 because the composite video
signal is above the nominal, DC-coupled input range of
0 to 0.25V.
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.
Video Signal Routing
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
Minimize the length of the PCB trace between the out-
put of the video DAC and the input of the MAX9509/
MAX9510 to reduce coupling of external noise into the
video signal. If possible, shield the PCB trace.
MAX9509
MAX9510
V
DD
V
DD
SHDN
SHUTDOWN
CIRCUIT
VIDEO
ASIC
Y
C
DAC
0.1µF
75Ω
IN
OUT
A
V
= 8V/V
LPF*
CLAMP
DAC
75Ω
V
DD
= 1.8V
DC-LEVEL
SHIFT
V
DD
LINEAR
REGULATOR
CHARGE PUMP
C3
0.1µF
GND
C1P
C1N
V
SS
C2
1µF
C1
1µF
*FOR MAX9509 ONLY.
Figure 6. Luma (Y) and chroma (C) signals are added together to create a composite video signal, which is AC-coupled into the
MAX9509/MAX9510.
Maxim Integrated
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Power-Supply Bypassing and Ground
Management
The MAX9509/MAX9510 operate from a 1.7V to 2.625V
single supply and require proper layout and bypassing.
For the best performance, place the components as close
to the device as possible.
Using a Digital Supply
The MAX9509/MAX9510 were designed to operate from
noisy digital supplies. The high PSRR (49dB at 100kHz)
allows the MAX9509/MAX9510 to reject the noise from
the digital power supplies (see the Typical Operating
Characteristics). If the digital power supply is very noisy
and stripes appear on the television screen, increase the
supply bypass capacitance. An additional, smaller capaci-
tor 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).
Proper grounding improves performance and prevents
any switching noise from coupling into the video signal.
Bypass the analog supply (V ) with a 0.1μF capacitor to
DD
GND, placed as close to the device as possible. Bypass
V
SS
with a 1μF capacitor to GND as close to the device
as possible. The total system bypass capacitance on
should be at least 10μF or ten times the capacitance
V
DD
between C1P and C1N.
Functional Diagram/Typical Application Circuit
DC-COUPLED INPUT
MAX9509
MAX9510
V
DD
SHDN
V
DD
SHUTDOWN
CIRCUIT
VIDEO
ASIC
75Ω
IN
OUT
A
V
= 8V/V
DAC
LPF*
TRANSPARENT
CLAMP
75Ω
V
DD
= 1.8V
DC-LEVEL
SHIFT
V
DD
LINEAR
REGULATOR
CHARGE PUMP
C3
0.1µF
GND
C1P
C1N
V
SS
C2
1µF
C1
1µF
*FOR MAX9509 ONLY.
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Pin Configurations
TOP VIEW
OUT SHDN IN
8
V
DD
7
6
5
V
1
2
3
4
8
7
6
5
OUT
SHDN
IN
SS
MAX9509
C1N
GND
C1P
MAX9510
EP*
4
+
1
2
3
V
DD
V
SS
C1N GND C1P
TDFN
µMAX
*EP = EXPOSED PAD.
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.
LAND
PATTERN
NO.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE NO.
8 TDFN-EP
8 µMAX
T822-1
U8-1
21-0168
21-0036
90-0064
90-0092
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MAX9509/MAX9510
1.8V, Ultra-Low Power, DirectDrive
Video Filter Amplifiers
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
Removed automotive reference from Applications section
CHANGED
2
5/14
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.
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 specifications 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.
2014 Maxim Integrated Products, Inc.
│ 15
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