MAX9508ATE+T [MAXIM]
Video Amplifier, 2 Channel(s), 1 Func, BICMOS, PQCC16, 3 X 3 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, MO-220WEED-2, TQFN-16;
| 型号： | MAX9508ATE+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Video Amplifier, 2 Channel(s), 1 Func, BICMOS, PQCC16, 3 X 3 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, MO-220WEED-2, TQFN-16 放大器 |
| 文件： | 总25页 (文件大小：401K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0531; Rev 0; 5/06
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
General Description
Features
The MAX9508 video filter amplifier with SmartSleep™
and bidirectional video support is ideal for set-top
boxes (STBs), portable DVD players, and portable
media players (PMPs). The inputs can be directly con-
nected to the digital-to-analog converter (DAC) outputs.
The reconstruction filter removes high-frequency sig-
nals above 6.75MHz. The amplifiers have 6dB of gain,
and the outputs can be DC-coupled to a load of 75Ω,
which is equivalent to two video loads, or it can be
AC-coupled to a load of 150Ω.
ꢀ SmartSleep Feature Detects Input Signal and
Output Load Status to Reduce Power
Consumption
ꢀ Triple Standard-Definition Video Reconstruction
Filters with 6.75MHz Passband
ꢀ Luma, Chroma, and Composite Inputs
ꢀ Luma, Chroma, and Two Composite Outputs
ꢀ Integrated Support for a Bidirectional Composite
The SmartSleep circuitry intelligently reduces power
consumption based on the presence of the input signal
and the output loads. When the MAX9508 does not
detect the presence of sync on the input video signal,
the supply current is reduced to less than 7µA. The
device only enables a video amplifier when there is an
active video input signal and an attached load. The
video amplifier remains on while a load is connected. If
the load is disconnected, the video amplifier is turned off.
Video Signal
ꢀ Supports Two Video Loads at Each Output
(DC-Coupled)
ꢀ 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART
PIN-PACKAGE PKG CODE TOP MARK
16 TQFN-EP**
(3mm x 3mm)
The MAX9508 contains three reconstruction filters, four
video amplifiers, and a pulldown switch at one of the
two CVBS outputs. The MAX9508 has the ability to con-
trol the bidirectional video signals at the CVBS video
connections without the need for separate switches or
relays. This feature is particularly useful for portable
DVD players, which often use the same connector to
drive a composite video output and to accept an exter-
nal video signal to display on the LCD panel.
MAX9508ATE+
T1633-4
E16-4
AEM
—
MAX9508AEE+* 16 QSOP
Note: All devices are specified over the -40°C to +125°C operat-
ing temperature range.
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed pad.
Block Diagrams
The MAX9508 operates from a 2.7V to 3.6V single supply
and is offered in a small 16-pin TQFN (3mm x 3mm)
package. The device is specified over the -40°C to
+125°C automotive temperature range.
LOAD SENSE
BUFFER
BUFFER
CIN
COUT
6dB
6dB
LPF
LPF
LOAD SENSE
Applications
YOUT
YIN
Set-Top Boxes (STBs)
INT/EXT
Portable Set-Top Boxes/
Personal Video Recorders (PVRs)
SMARTSLEEP
SHDN
CONTROL
LOGIC
MAX9508
Portable Media Players (PMPs)
Portable DVD Players
LOAD SENSE
ACTIVE VIDEO
DETECT
CVBSOUT1
CVBSOUT2
6dB
6dB
CVBSIN
Portable Applications
BUFFER
LPF
EXTCVBSIN
LOAD SENSE
CLAMP
Pin Configurations appear at end of data sheet.
Block Diagrams continued at end of data sheet.
SmartSleep is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to GND.)
Continuous Power Dissipation (T = +70°C)
A
V
-0.3V to +4V
16-Pin TQFN (derate 15.6mW/°C above +70°C)..........1250mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
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
DD ..........................................................................
SMARTSLEEP, SHDN, INT/EXT
CIN, YIN, CVBSIN, EXTCVBSIN ..........................-0.3V to +4V
Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2
Short Circuit to V
Continuous Input Current
or GND..................................Continuous
DD
(CIN, YIN, EXTCVBSIN, CVBSIN,
SMARTSLEEP, SHDN, INT/EXT)................................... 20mA
MAX9508
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
= V
= 3.3V, V
= V
= GND = 0V, R = No load. T = T
to T
, unless otherwise noted. Typical val-
MAX
SHDN
DD
SMARTSLEEP
INT/EXT
L
A
MIN
ues are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
2.7
3.6
V
DD
INT/EXT = GND (4 channels active),
YIN = CVBSIN = 0.3V, CIN = 0.6V
13
16
mA
µA
INT/EXT = V (1 channel active),
EXTCVBSIN is unconnected
DD
4.3
7
6
Supply Current
I
DD
SMARTSLEEP = V
DD,
14
CVBSIN has no active video signal
SMARTSLEEP = V , CVBSIN has a black-
DD
burst video signal with sync tip at GND
(Note 2)
17
Shutdown Supply Current
SMARTSLEEP CHARACTERISTICS
Minimum Line Frequency
Sync Slice Level
I
V
= GND
SHDN
0.01
10
µA
SHDN
CVBSIN
CVBSIN
14.3
4.1
kHz
5.2
% V
DD
Output Load Detect Threshold
DC CHARACTERISTICS
Sync pulse present, R to GND
200
Ω
L
CIN, YIN, CVBSIN,
guaranteed by output
voltage swing
2.7V < V
3.0V < V
< 3.6V
< 3.6V
0
0
1.05
DD
DD
Input-Voltage Range
V
V
IN
1.2
5
Input Current
I
CIN = YIN = CVBSIN = 0V
CIN, YIN, CVBSIN
2
µA
IN
Input Resistance
R
20
MΩ
IN
2
_______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
ELECTRICAL CHARACTERISTICS (continued)
(V
= V
= 3.3V, V
= V
= GND = 0V, R = No load. T = T
to T
, unless otherwise noted. Typical val-
MAX
SHDN
DD
SMARTSLEEP
INT/EXT
L
A
MIN
ues are at T = +25°C.) (Note 1)
A
PARAMETER
Sync-Tip Clamp Level
Input Clamping Current
SYMBOL
CONDITIONS
MIN
0.25
0.5
TYP
MAX
0.37
1.5
UNITS
V
V
EXTCVBSIN
EXTCVBSIN = 500mV + V
CLP
1
µA
CLP
Guaranteed by
output voltage
swing
2.7V < V
3.0V < V
< 3.6V
< 3.6V
1.05
1.2
DD
DD
EXTCVBSIN Input Voltage Range
V
P-P
EXTCVBSIN, percentage reduction in sync
pulse (0.3V ), guaranteed by input
P-P
clamping current measurement, measured
at input
Sync Crush
2
%
Maximum Input Source
Resistance
EXTCVBSIN
300
6
Ω
R = 150Ω to V /2, 0V ≤ V ≤ 1.05V,
L
DD
IN
DC Voltage Gain
A
V
5.7
-0.2
0.21
6.3
dB
dB
V
= 2.7V
DD
R = 150Ω to V /2, 0V ≤ V ≤ 1.05V,
L
DD
IN
DC Gain Matching
0
+0.2
0.38
V
= 2.7V
DD
YIN = CVBSIN = CIN = 0V,
INT/EXT = GND, R = 150Ω to GND
0.3
L
Output Level
V
C
= 0.1µF to GND,
EXTCVBSIN
0.21
2.027
2.006
0.27
2.1
0.38
2.163
2.163
INT/EXT = V
R = 150Ω to GND
L
DD,
T
= -40°C to
A
Measured at output,
= 2.7V,
+85°C
V
DD
0V ≤ V ≤ 1.05V,
T
= -40°C to
IN
A
R = 150Ω to -0.2V
L
+125°C
Measured at output, V
= 2.7V,
DD
2.027
2.1
2.4
2.163
0V ≤ V ≤ 1.05V, R = 150Ω to V / 2
DD
IN
L
T
A
= -40°C to
Measured at output,
= 3V,
2.316
2.292
2.472
2.472
Output Voltage Swing
V
P-P
+85°C
V
DD
0V ≤ V ≤ 1.2V,
T
A
= -40°C to
IN
R = 150Ω to -0.2V
L
+125°C
Measured at output, V
= 3V,
DD
2.316
2.027
2.4
2.472
2.163
0V ≤ V ≤ 1.2V, R = 150Ω to V
/ 2
IN
L
DD
Measured at output, V
= 3.135V,
DD
2.1
0V ≤ V ≤ 1.05V, R = 75Ω to -0.2V
IN
L
Output Resistance
R
V
= 1.3V, -5mA ≤ I ≤ +5mA
LOAD
0.47
Ω
OUT
OUT
_______________________________________________________________________________________
3
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
ELECTRICAL CHARACTERISTICS (continued)
(V
= V
= 3.3V, V
= V
= GND = 0V, R = No load. T = T
to T
, unless otherwise noted. Typical val-
MAX
SHDN
DD
SMARTSLEEP
INT/EXT
L
A
MIN
ues are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
≤ 3.6V, input referred,
R = 150Ω to GND
MIN
TYP
MAX
UNITS
2.7V ≤ V
L
DD
Power-Supply Rejection Ratio
PSRR
48
dB
Output Pulldown Resistance
Output Shutdown Impedance
R
INT/EXT = V , CVBSOUT1
3.7
28
Ω
PD
DD
MAX9508
kΩ
LOGIC INPUTS (SMARTSLEEP, SHDN, INT/EXT)
0.3 x
Logic-Low Threshold
V
V
IL
V
DD
0.7 x
Logic-High Threshold
Logic Input Current
V
V
IH
V
DD
I
/ I
IL IH
V = 0V or V
I DD
0.01
10
µA
AC ELECTRICAL CHARACTERISTICS
(V
= V
= 3.3V, V
= V
= GND = 0V, R = 150Ω to GND. T = T
to T
, unless otherwise noted. Typical
MAX
DD
SMARTSLEEP
L
SHDN
INT/EXT
A
MIN
values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
-0.1
-0.3
-3
MAX UNITS
f = 5.5MHz
f = 6.75MHz
f = 11MHz
f = 27MHz
-1
+1
dB
Standard-Definition
Reconstruction Filter
Inputs are 1V , reference
P-P
frequency is 1MHz.
-33
-41
DC-coupled output,
5-step modulated staircase
f = 3.58MHz or
4.43MHz
0.2
0.4
Differential Gain
Differential Phase
DG
DP
%
AC-coupled output,
5-step modulated staircase
f = 3.58MHz or
4.43MHz
f = 3.58MHz
f = 4.43MHz
f = 3.58MHz
f = 4.43MHz
0.62
0.75
0.78
1.01
0.2
DC-coupled output,
5-step modulated staircase
Degrees
AC-coupled output,
5-step modulated staircase
2T Pulse Response
2T Bar Response
2T = 200ns or 250ns
K%
K%
Bar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time is ignored, 2T = 200ns or 250ns
0.2
0.3
2T Pulse-to-Bar K
Rating
Bar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time is ignored, 2T = 200ns or 250ns
K%
4
_______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
AC ELECTRICAL CHARACTERISTICS (continued)
(V
= V
= 3.3V, V
= V
= GND = 0V, R = 150Ω to GND. T = T
to T
, unless otherwise noted. Typical
MAX
DD
SMARTSLEEP
L
SHDN
INT/EXT
A
MIN
values are at T = +25°C.) (Note 1)
A
PARAMETER
Nonlinearity
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
5-step staircase
0.1
%
Interchannel Timing
Error
Difference in time between the 50% point of the output
signals, YOUT to COUT
0.2
10
2
ns
ns
ns
dB
Group Delay
Distortion
100kHz ≤ f ≤ 5MHz, inputs are 1V
P-P
Interchannel Group
Delay Distortion Error
Inputs are 1V
P-P
Peak Signal to RMS
Noise
100kHz ≤ f ≤ 5MHz, inputs are 1V
67
P-P
Power-Supply
Rejection Ratio
f = 100kHz, 200mV , input referred
P-P
43
6
dB
Ω
Output Impedance
f = 5MHz
YIN = 1V, output settled to within 1% of the final voltage,
R = 150Ω to GND
L
Enable Time
13
µs
YIN = 1V, output settled to within 1% of the final voltage,
R = 150Ω to GND
L
Disable Time
1.1
µs
CROSSTALK
All Hostile Output
Crosstalk
f = 4.43MHz
-70
-69
dB
dB
All Hostile Input
Crosstalk
f = 4.43MHz, SHDN = GND,
input termination resistors are 75Ω
Note 1: All devices are 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.
A
Note 2: Specified current is an average over time.
_______________________________________________________________________________________
5
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
Typical Operating Characteristics
(V
= SHDN = +3.3V, V
= V
= GND = 0V. R = 150Ω to GND. T = +25°C, unless otherwise noted.)
SMARTSLEEP
INT/EXT
DD
L
A
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
SMALL-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN
vs. FREQUENCY
1.0
0.8
0.6
0.4
0.2
0
20
20
10
V
= 100mV
P-P
NORMALIZED TO 1MHz
V
= 2V
P-P
NORMALIZED TO 1MHz
OUT
V
= 100mV
OUT
OUT
P-P
10
0
NORMALIZED TO 1MHz
MAX9508
0
-10
-20
-30
-40
-50
-60
-10
-20
-30
-40
-50
-60
-0.2
-0.4
-0.6
-0.8
-1.0
1M
10M
100k
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
GROUP DELAY
1.0
0.8
150
125
100
75
0
-10
-20
-30
-40
-50
-60
-70
-80
V
= 2V
P-P
V
= 2V
OUT
OUT
P-P
NORMALIZED TO 1MHz
0.6
0.4
0.2
0
50
-0.2
-0.4
-0.6
-0.8
-1.0
25
0
-25
100k
1M
10M
100M
100k
1M
10M
100M
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
VOLTAGE GAIN
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
2.02
2.01
2.00
1.99
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
14.0
13.5
13.0
12.5
12.0
11.5
11.0
YIN, CIN, CVBSIN
INPUTS ONLY
1.98
1.97
1.96
1.95
-0.5
-50 -25
0
25
50
75 100 125
-0.5
0
0.5
1.0
1.5
2.0
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
6
_______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Typical Operating Characteristics (continued)
(V
= SHDN = +3.3V, V
= V
= GND = 0V. R = 150Ω to GND. T = +25°C, unless otherwise noted.)
SMARTSLEEP
INT/EXT
DD
L
A
2T RESPONSE
12.5T RESPONSE
DIFFERENTIAL GAIN AND PHASE
MAX9508 toc11
MAX9508 toc12
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
V
IN
Y
IN
200mV/div
200mV/div
1
2
3
4
5
6
7
0.8
0.4
0
V
OUT
Y
OUT
400mV/div
400mV/div
-0.4
-0.8
100ns/div
400ns/div
1
2
3
4
5
6
7
STEP
NTC-7 VIDEO TEST
SIGNAL ON CVBS OUTPUTS
PAL MULTIBURST RESPONSE
PAL COLOR BARS
MAX9508 toc13
MAX9508 toc14
MAX9508 toc15
CVBSIN
500mV/div
CVBSIN
500mV/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
CVBSOUT1
1V/div
CVBSOUT1
1V/div
10µs/div
10µs/div
10µs/div
FIELD SQUARE-WAVE RESPONSE
ENABLE TIME
DISABLE TIME
MAX9508 toc16
MAX9508 toc17
MAX9508 toc18
INPUT VOLTAGE = 1V
INPUT VOLTAGE = 1V
CVBSIN
500mV/div
OUTPUT
1V/div
OUTPUT
1V/div
CVBSOUT1
1V/div
SHDN
1V/div
SHDN
1V/div
2ms/div
2µs/div
200ns/div
_______________________________________________________________________________________
7
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
Typical Operating Characteristics (continued)
(V
= SHDN = +3.3V, V
= V
= GND = 0V. R = 150Ω to GND. T = +25°C, unless otherwise noted.)
INT/EXT
L A
SMARTSLEEP
DD
PULLDOWN RESISTANCE
vs. TEMPERATURE
FREQUENCY RESPONSE
AT 6.75MHz DISTRIBUTION
PULLDOWN RESISTANCE
DISTRIBUTION
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
MAX9508
-50 -25
0
25
50
75 100 125
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
TEMPERATURE (°C)
ATTENUATION (dB)
PULLDOWN RESISTANCE (Ω)
INPUT-TO-INPUT CROSSTALK
vs. FREQUENCY
FREQUENCY RESPONSE
AT 27MHz DISTRIBUTION
0
-20
-40
-60
-80
-100
-120
100k
-52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32
ATTENUATION (dB)
1M
10M
100M
FREQUENCY (Hz)
OUTPUT-TO-OUTPUT CROSSTALK
vs. FREQUENCY
OUTPUT IMPEDANCE
vs. FREQUENCY
0
-20
100
10
1
-40
-60
-80
-100
-120
0.1
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
8
_______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Pin Description
PIN
NAME
FUNCTION
TQFN
1, 13
2
QSOP
3, 15
4
V
Power Supply. Bypass V
with a 0.1µF capacitor to ground.
DD
DD
YIN
GND
Luma Video Input. Directly connect this input to the video DAC output.
Ground
3, 8
4
5, 10
6
CVBSIN
EXTCVBSIN
Internal CVBS Signal Input. Directly connect this input to the video DAC output.
External CVBS Signal Input. AC-couple the signal through a 0.1µF capacitor to this input.
5
7
Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown.
Connect to logic high for normal operation.
6
8
SHDN
7
9
N.C.
CVBSOUT2
CVBSOUT1
YOUT
No Connection. Connect to GND.
9
11
12
13
14
CVBS Output 2
10
11
12
CVBS Output 1. CVBSOUT1 is actively pulled to GND when INT/EXT is logic high.
Luma Video Output
COUT
Chroma Video Output
Internal/External CVBS Logic Input. Connect INT/EXT low to process CVBS video signals
from CVBSIN input. Connect INT/EXT high to process CVBS video signals from EXTCVBSIN
input.
14
16
INT/EXT
15
16
EP
1
2
SMARTSLEEP SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation.
CIN
EP
Chroma Video Input. Directly connect this input to the video DAC output.
Exposed Pad. Connect EP to GND. EP is also internally connected to GND.
—
_______________________________________________________________________________________
9
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
+3.3V
0.1µF
V
DD
75Ω
75Ω
DVD CHIP
TO TFT LCD
LOAD SENSE
LOAD SENSE
BUFFER
BUFFER
CIN
YIN
COUT
YOUT
CURRENT
DAC
6dB
6dB
SVIDEO CHROMA
LPF
LPF
MAX9508
75Ω
75Ω
TO TFT LCD
CURRENT
DAC
SVIDEO LUMA
INT/EXT
SMARTSLEEP
MAX9508
CONTROL
LOGIC
MICROCONTROLLER
+3.3V
SHDN
ACTIVE VIDEO
DETECT
LOAD SENSE
75Ω
CVBSOUT1
6dB
CVBS
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
LOAD SENSE
CLAMP
75Ω
CVBSOUT2
TO Y/C SEPARATION
6dB
0.1µF
GND
Figure 1. Typical Application Circuit for Portable DVD Player
COUT, YOUT, and CVBSOUT1 become high imped-
ance. The n-channel switch at CVBSOUT1 turns on,
thereby converting the back termination resistor into an
input termination resistor.
Detailed Description
In the typical application circuit for a portable DVD
player (Figure 1), the current DACs on a DVD decoder
chip generate video signals. When the internal signal
sources are selected, the MAX9508 filters those signals
and then drives the video connectors through a 75Ω
back termination resistor. When external video sources
are selected, the MAX9508 selects the external com-
posite video signal (EXTCVBSIN), filters, and amplifies
it. The output stages of the amplifiers connected to
SmartSleep Feature
The SmartSleep feature is activated when the SMARTSLEEP
input is connected to logic high. The SmartSleep feature
provides intelligent power management by selectively
disabling the filters and output amplifiers based on
the presence of video signals or loads attached to the
10 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
outputs. If the SmartSleep feature is not activated and
Standby Mode
In standby mode, the filters and output amplifiers are
off and only the active video detect circuit is active.
Quiescent current consumption is approximately 7µA
(Figure 2). The active video-detect circuit checks if
sync is present on the CVBSIN signal. If no sync is
detected the device remains in standby mode.
the part is not in shutdown, the filters and output ampli-
fiers completely turn on, regardless of whether there is
a video signal at the CVBSIN input and whether there
are loads connected at the outputs.
SmartSleep only works with DC-coupled loads.
+3.3V
7µA
V
DD
VIDEO ENCODER
LOAD SENSE
OFF
BUFFER
75Ω
75Ω
CIN
COUT
YOUT
SVIDEO
CHROMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
LOAD SENSE
OFF
BUFFER
YIN
SVIDEO
LUMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
INT/EXT
MAX9508
SMARTSLEEP
SHDN
CONTROL
LOGIC
+3.3V
LOAD SENSE
OFF
ACTIVE VIDEO
DETECT
75Ω
CVBSOUT1
CVBS 1
6dB
OFF
CVBSIN
CURRENT
DAC
BUFFER
OFF
LPF
OFF
EXTCVBSIN
+3.3V
LOAD SENSE
OFF
CLAMP
OFF
75Ω
NO VIDEO
SIGNAL
CVBSOUT2
CVBS 2
6dB
OFF
GND
Figure 2. Standby Mode
______________________________________________________________________________________ 11
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
Active-Detect Mode
The active video-detect circuit slices the CVBSIN signal
at 4.7% of the power supply (155mV for a 3.3V supply).
If the transitions occur at a rate of 14kHz or higher, a
video signal is present. When the MAX9508 detects a
video signal with sync at the CVBSIN input, the control
logic enters the active-detect mode and enables the
load sense circuitry (Figure 3). The supply current is
typically 17µA.
If an output load is not connected to any amplifier, the
MAX9508 remains in active-detect mode. Eight times per
second, each load-sense circuit checks for a load by
connecting an internal 15kΩ pullup resistor to the output
for 1ms. If the output is pulled up, then no load is pre-
sent. If the output stays low, a load is connected.
MAX9508
+3.3V
17µA
V
DD
VIDEO ENCODER
LOAD SENSE
LOAD SENSE
BUFFER
75Ω
75Ω
CIN
YIN
COUT
YOUT
SVIDEO
CHROMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
BUFFER
SVIDEO
LUMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
INT/EXT
SMARTSLEEP
SHDN
NO
LOADS
MAX9508
CONTROL
LOGIC
+3.3V
LOAD SENSE
ACTIVE VIDEO
DETECT
75Ω
CVBSOUT1
CVBS 1
6dB
OFF
CVBSIN
CURRENT
DAC
BUFFER
OFF
LPF
OFF
EXTCVBSIN
+3.3V
LOAD SENSE
CLAMP
OFF
75Ω
VIDEO SIGNAL
PRESENT
CVBSOUT2
CVBS 2
6dB
OFF
0
TO
50mV
GND
Figure 3. Active-Detect Mode with No Output Loads
12 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Full-Operation Mode
If a load is connected to an output, the corresponding
filter and amplifier turn on and remain on until the out-
put load is disconnected. In full-operation mode,
SmartSleep intelligently reduces the supply current
based on the input signal presence and output loading.
Figures 4, 5, and 6 show which portions of the
MAX9508 turn on and which remain off with different
load configurations.
output is sourcing current during a horizontal line time.
If no sourcing current is detected within one horizontal
line time (approximately 64µs), the load has been dis-
connected and the amplifier returns to active-detect
mode. If, at any time, the input video signal is removed,
the MAX9508 returns to standby mode.
If the SmartSleep feature is not activated and the part is
not in shutdown, the filters and amplifiers completely
turn on, regardless of whether there is a video signal at
the CVBSIN input and whether there are loads connect-
ed at the outputs.
When an amplifier is on, it continually checks if the load
has been disconnected by detecting if the amplifier
+3.3V
2.9mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
V
DD
VIDEO ENCODER
LOAD SENSE
LOAD SENSE
BUFFER
75Ω
75Ω
CIN
COUT
YOUT
SVIDEO
CHROMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
BUFFER
YIN
SVIDEO
LUMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
INT/EXT
SMARTSLEEP
SHDN
MAX9508
CONTROL
LOGIC
+3.3V
LOAD SENSE
ACTIVE VIDEO
DETECT
CVBS1
75Ω
CVBSOUT1
6dB
CVBSIN
CURRENT
DAC
75Ω
BUFFER
LPF
EXTCVBSIN
+3.3V
LOAD SENSE
CLAMP
OFF
75Ω
VIDEO SIGNAL
PRESENT
CVBSOUT2
CVBS 2
6dB
OFF
0
TO
50mV
GND
Figure 4. Full-Operation Mode with CVBSOUT1 Loaded
______________________________________________________________________________________ 13
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
+3.3V
2.9mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
V
DD
VIDEO ENCODER
LOAD SENSE
LOAD SENSE
BUFFER
75Ω
75Ω
CIN
YIN
COUT
YOUT
5
SVIDEO
CHROMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
BUFFER
SVIDEO
LUMA
CURRENT
DAC
6dB
OFF
LPF
OFF
OFF
INT/EXT
SMARTSLEEP
SHDN
MAX9508
CONTROL
LOGIC
+3.3V
LOAD SENSE
ACTIVE VIDEO
DETECT
75Ω
CVBSOUT1
CVBS 1
6dB
OFF
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
+3.3V
LOAD SENSE
CLAMP
OFF
CVBS2
75Ω
VIDEO SIGNAL
PRESENT
CVBSOUT2
6dB
0
TO
75Ω
50mV
GND
Figure 5. Full-Operation Mode with CVBSOUT2 Loaded
14 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
+3.3V
10.5mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
V
DD
VIDEO ENCODER
LOAD SENSE
LOAD SENSE
BUFFER
BUFFER
SVIDEO CHROMA
SVIDEO LUMA
75Ω
75Ω
CIN
YIN
COUT
YOUT
CURRENT
DAC
6dB
6dB
LPF
LPF
75Ω
75Ω
CURRENT
DAC
INT/EXT
SMARTSLEEP
SHDN
MAX9508
CONTROL
LOGIC
+3.3V
LOAD SENSE
ACTIVE VIDEO
DETECT
CVBS1
75Ω
CVBSOUT1
6dB
CVBSIN
CURRENT
DAC
75Ω
BUFFER
LPF
EXTCVBSIN
+3.3V
LOAD SENSE
CLAMP
OFF
CVBS2
75Ω
VIDEO SIGNAL
PRESENT
CVBSOUT2
6dB
0
TO
75Ω
50mV
GND
Figure 6. Full-Operation Mode with All Outputs Loaded
______________________________________________________________________________________ 15
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
source such as a DVD chip (Figure 7). The 2:1 multi-
plexer selects the video signal on CVBSIN. The
EXTCVBSIN video signal is ignored.
Internal Mode Versus External Mode
Internal Mode
Set the INT/EXT control input low for internal mode. The
MAX9508 processes video signals from an internal
+3.3V
MAX9508
0.1µF
13mA QUIESCENT
SUPPLY CURRENT
V
DD
75Ω
75Ω
DVD CHIP
TO TFT LCD
LOAD SENSE
LOAD SENSE
BUFFER
CIN
COUT
YOUT
CURRENT
DAC
6dB
6dB
SVIDEO CHROMA
LPF
75Ω
75Ω
TO TFT LCD
BUFFER
YIN
CURRENT
DAC
SVIDEO LUMA
LPF
LOGIC
LOW
INT/EXT
MAX9508
SMARTSLEEP
SHDN
CONTROL
LOGIC
MICROCONTROLLER
+3.3V
ACTIVE VIDEO
DETECT
LOAD SENSE
75Ω
CVBSOUT1
6dB
CVBS
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
LOAD SENSE
CLAMP
OFF
75Ω
CVBSOUT2
TO Y/C SEPARATION
6dB
0.1µF
GND
Figure 7. Internal Mode Operation
16 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
External Mode
Set the INT/EXT control input high for external mode.
The 2:1 multiplexer selects the video signal on
EXTCVBSIN (Figure 8). The YIN, CIN, and CVBSIN sig-
nals are ignored. The block drawing of the MAX9508 in
Figure 8 shows which circuits are off while in external
mode. SmartSleep does not function in external mode,
and the SMARTSLEEP input is ignored.
+3.3V
4.3mA QUIESCENT
SUPPLY CURRENT
V
DD
75Ω
DVD CHIP
TO TFT LCD
LOAD SENSE
BUFFER
75Ω
OFF
CIN
COUT
CURRENT
DAC
6dB
OFF
SVIDEO CHROMA
LPF
OFF
OFF
BUFFER
OFF
75Ω
75Ω
TO TFT LCD
LOAD SENSE
OFF
YOUT
YIN
CURRENT
DAC
6dB
OFF
SVIDEO LUMA
LPF
OFF
LOGIC
HIGH
INT/EXT
MAX9508
SMARTSLEEP
SHDN
0V OR
+3.3V
CONTROL
LOGIC
MICROCONTROLLER
+3.3V
ACTIVE VIDEO
DETECT
LOAD SENSE
OFF
CVBS
75Ω
75Ω
CVBSOUT1
VIDEO
SOURCE
6dB
OFF
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
LOAD SENSE
CLAMP
75Ω
CVBSOUT2
TO Y/C SEPARATION
6dB
0.1µF
GND
Figure 8. External Mode Operation
______________________________________________________________________________________ 17
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
applied to YIN, CIN, and CVBSIN. The RGB set and the
YPbPr set can also be inputs to YIN, CIN, and CVBSIN
(Figure 9).
Inputs
The MAX9508 video inputs YIN, CIN, and CVBSIN
should be directly connected to the output of the video
current DAC. DC-coupling ensures that the input sig-
nals are ground referenced such that the sync tip of
composite or luma signals is within 50mV of ground
and the blank level of the chroma signal is between
0.5V and 0.65V. Since the input buffer is identical for
YIN, CIN, and CVBSIN, any standard-definition video
signal can be applied to those inputs as long as the
The EXTCVBSIN input can only handle signals with a
sync pulse, such as composite, video, or luma.
Because the DC level of an external video input signal
is unknown, the external video signal is AC-coupled
through a 0.1µF capacitor, and a sync tip clamp sets
the internal DC level of the MAX9508. A 2:1 multiplexer
under the control of the INT/EXT input selects either the
signal at CVBSIN or EXTCVBSIN.
MAX9508
signal is between ground and 1.05V when V
= 2.7V.
DD
For example, three composite video signals could be
+3.3V
0.1µF
V
DD
VIDEO ENCODER
LOAD SENSE
LOAD SENSE
BUFFER
Pr/R
75Ω
75Ω
CIN
COUT
YOUT
CURRENT
DAC
6dB
6dB
Pr/R
LPF
LPF
BUFFER
Pb/B
YIN
CURRENT
DAC
Pb/B
INT/EXT
MAX9508
SMARTSLEEP
SHDN
CONTROL
LOGIC
+3.3V
ACTIVE VIDEO
DETECT
LOAD SENSE
75Ω
CVBSOUT1
6dB
Y/G
Y/G
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
+3.3V
LOAD SENSE
CLAMP
75Ω
CVBSOUT2
Y/G
6dB
GND
Figure 9. Y, P , P or RGB Set Applied to MAX9508
r
b
18 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Video Reconstruction Filter
Applications Information
Reducing Power Consumption
in the Video DACs
The MAX9508 filter passband is 6.75MHz, which makes
the device suitable for the higher bandwidth video sig-
nals from a DVD chip. Broadcast video signals actually
require less bandwidth because of channel limitations:
NTSC signals have a 4.2MHz bandwidth, and PAL sig-
nals have a 5MHz bandwidth. Video signals from a DVD
player are not channel limited; therefore, the bandwidth
of DVD video signals can push right against the Nyquist
limit of 6.75MHz. (Recommendation ITU-R BT.601-5
specifies 13.5MHz as the sampling rate for standard-
definition video). Therefore, the maximum bandwidth of
the signal is 6.75MHz. To ease the filtering require-
ments, most modern video systems oversample by two
times; clocking the video current DAC at 27MHz.
YIN, CIN, and CVBSIN have high-impedance input
buffers and can work with source resistances as high as
300Ω. To reduce power dissipation in the video DACs,
the DAC output resistor can be scaled up in value. The
reference resistor that sets the reference current inside
the video DACs must also be similarly scaled up. For
instance, if the output resistor is 37.5Ω, the DAC must
source 26.7mA when the output is 1V. If the output resis-
tor is increased to 300Ω, the DAC only needs to source
3.33mA when the output is 1V.
There is parasitic capacitance from the DAC output to
ground. That capacitance in parallel with the DAC out-
put resistor forms a pole that can potentially roll off the
frequency response of the video signal. For example,
300Ω in parallel with 50pF creates a pole at 10.6MHz.
To minimize this capacitance, reduce the area of the
signal trace attached to the DAC output as much as
possible, and place the MAX9508 as close to the video
DAC outputs as possible.
Outputs
The video output amplifiers can both source and sink
load current, allowing output loads to be DC- or AC-
coupled. The amplifier output stage needs about
300mV of headroom from either supply rail. The
MAX9508 has an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output. The
blank level of the chroma output is positioned at
approximately 1.3V if the blank level of the chroma
input signal is 0.5V. The blank level of the chroma out-
put is positioned at approximately 1.5V if the blank level
of the chroma input signal is 0.6V.
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 10.
Coupling capacitors should be 220µF or greater to
keep the highpass filter formed by the 150Ω equivalent
resistance of the video transmission line to a corner fre-
quency of 4.8Hz or below. The frame rate of PAL sys-
tems is 25Hz, and the frame rate of NTSC systems is
30Hz. The corner frequency should be well below the
frame rate.
If the supply voltage is greater than 3.135V (5% below
a 3.3V supply), each amplifier can drive two DC-cou-
pled video loads to ground. If the supply is less than
3.135V, each amplifier can drive only one DC-coupled
or AC-coupled video load.
Shutdown
When SHDN is low, the MAX9508 draws typically less
than 10nA supply current. All the amplifier outputs
become high impedance. The effective output resis-
tance at the video outputs is 28kΩ, due to the internal
feedback resistors to ground.
______________________________________________________________________________________ 19
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
+3.3V
0.1µF
V
DD
SET-TOP BOX CHIP
220µF
OPTIONAL
LOAD SENSE
LOAD SENSE
BUFFER
BUFFER
75Ω
75Ω
MAX9508
CIN
YIN
COUT
YOUT
SVIDEO
CURRENT
DAC
6dB
6dB
LPF
LPF
CHROMA
220µF
OPTIONAL
SVIDEO
LUMA
CURRENT
DAC
INT/EXT
MAX9508
SMARTSLEEP
CONTROL
LOGIC
SHDN
+3.3V
220µF
OPTIONAL
ACTIVE VIDEO
DETECT
LOAD SENSE
75Ω
CVBSOUT1
6dB
CVBS 1
CVBSIN
CURRENT
DAC
BUFFER
LPF
EXTCVBSIN
220µF
OPTIONAL
LOAD SENSE
CLAMP
OFF
75Ω
GND
CVBSOUT2
CVBS 2
6dB
GND
Figure 10. AC-Coupled Outputs
Power-Supply Bypassing and Ground
The MAX9508 operates from a single-supply voltage
down to 2.7V, allowing for low-power operation. Bypass
V
to GND with a 0.1µF capacitor. Place all external
DD
components as close to the device as possible.
20 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Block Diagrams (continued)
LOAD SENSE
BUFFER
COUT
YOUT
CIN
YIN
6dB
6dB
LPF
LOAD SENSE
BUFFER
LPF
INT/EXT
SMARTSLEEP
SHDN
MAX9508
CONTROL
LOGIC
300mV
TO
400mV
ACTIVE VIDEO
DETECT
0
TO
50mV
LOAD SENSE
CVBSOUT1
6dB
CVBSIN
BUFFER
LPF
EXTCVBSIN
LOAD SENSE
CLAMP
CVBSOUT2
6dB
______________________________________________________________________________________ 21
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
Pin Configurations
TOP VIEW
+
SMARTSLEEP
CIN
12
11
10
9
1
2
3
4
5
6
7
8
16 INT/EXT
15
V
DD
GND
13
14
V
8
7
6
5
MAX9508
DD
V
DD
14 COUT
N.C.
INT/EXT
YIN
GND
MAX9508
13 YOUT
MAX9508
12 CVBSOUT1
11 CVBSOUT2
10 GND
SHDN
SMARTSLEEP 15
16
CVBSIN
EXTCVBSIN
SHDN
EXTCVBSIN
CIN
+
1
2
3
4
9
N.C.
QSOP
THIN QFN
(3mm x 3mm)
Chip Information
PROCESS: BiCMOS
22 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
(NE - 1)
X e
MARKING
E
E/2
D2/2
(ND - 1)
X e
D/2
AAAA
e
C
D2
D
L
k
b
0.10 M
C
A
B
C
L
E2/2
L
E2
C
C
L
L
0.10
C
0.08 C
A
A2
A1
L
L
e
e
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
1
21-0136
G
2
______________________________________________________________________________________ 23
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PKG
8L 3x3
12L 3x3
16L 3x3
EXPOSED PAD VARIATIONS
REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
DOWN
D2
E2
PKG.
BONDS
ALLOWED
PIN ID
JEDEC
CODES
A
b
0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80
0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30
2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10
2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10
MAX.
NOM.
MAX.
MIN. NOM.
MIN.
0.25
0.95
0.95
0.95
0.95
0.95
0.65
0.65
0.95
MAX9508
TQ833-1
T1233-1
T1233-3
T1233-4
T1633-1
T1633-2
T1633F-3
0.70 1.25
0.70 1.25
1.10 1.25
0.25
0.95
0.95
0.95
0.95
0.95
0.65
0.35 x 45°
0.35 x 45°
0.35 x 45°
0.35 x 45°
0.35 x 45°
0.35 x 45°
WEEC
NO
NO
D
1.25
1.25
1.25
1.10
1.10
1.10
WEED-1
WEED-1
WEED-1
WEED-2
WEED-2
E
e
1.10
1.10
1.10
1.10
0.80
0.80
1.10
1.25
1.25
1.25
1.25
0.95
0.95
1.25
YES
YES
NO
0.65 BSC.
0.50 BSC.
0.50 BSC.
0.35 0.55 0.75 0.45 0.55 0.65 0.30 0.40 0.50
L
N
1.10 1.25
1.10 1.25
0.80 0.95
8
12
16
YES
ND
NE
A1
A2
k
2
3
4
0.225 x 45° WEED-2
0.225 x 45° WEED-2
N/A
N/A
NO
2
3
4
T1633FH-3 0.65
T1633-4
0.95
0.95
0.80
0.02 0.05
0.02 0.05
0.02 0.05
0
0
0
1.10 1.25
0.35 x 45°
WEED-2
0.20 REF
0.20 REF
0.20 REF
-
-
-
-
-
-
0.25
0.25
0.25
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO
JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED
WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.
10. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
11. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
PACKAGE OUTLINE
8, 12, 16L THIN QFN, 3x3x0.8mm
2
21-0136
G
2
24 ______________________________________________________________________________________
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
MAX9508
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH
1
21-0055
F
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25
© 2006 Maxim Integrated Products
Heaney
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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