MAX9508ATE+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX9508ATE+T ,Video Filter Amplifier with SmartSleep and Bidirectional Video SupportFeaturesThe MAX9508 video filter amplifier with SmartSleep and♦ SmartSleep Feature Detects Input Si ..
MAX9511CEG ,RGBHV Driver with EMI SuppressionApplicationsBLUE_IN BLUE_OUTNotebook PCs (Laptops)Docking StationsLOAD-DETECT CIRCUITRYGraphics Car ..
MAX9511CEG ,RGBHV Driver with EMI SuppressionELECTRICAL CHARACTERISTICS(V = 5V, V = 5V, V = SHDN = 3V, R = 150Ω to AGND, DGND = AGND, R = 7kΩ to ..
MAX9511CEG+ ,RGBHV Driver with EMI SuppressionFeaturesThe MAX9511 provides a complete VGA interface♦ RGB Drivers with Adjustable Slew Rate for EM ..
MAX9512ATE+T ,Video Filter Amplifier with SmartSleep and Y-C Mixer CircuitFeaturesThe MAX9512 video filter amplifier with SmartSleep and♦ SmartSleep Feature Detects Input Si ..
MAX9516ALB+T ,1.8V, Ultra-Low-Power, DirectDrive Video Filter Amplifier with Load DetectFeaturesOperating at 1.8V from a single power supply, the ● 1.8V or 2.5V Single-Supply OperationMAX ..
MB8868A ,MOS Universal Asynchronous Receiver / Transmitter (UART)Features I Full or Hall Duplex Operation I Completely Programmable I Start Bit Generated ..
MB89121 ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12509-6EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89120/1 ..
MB89123A ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12509-6EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89120/1 ..
MB89133A ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12510-9EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89130/1 ..
MB89153 ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12506-4EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89150/1 ..
MB89163 ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12405-2EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89160/1 ..

MAX9508ATE+T
Video Filter Amplifier with SmartSleep and Bidirectional Video Support
General Description
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 connected
to the digital-to-analog converter (DAC) outputs. The
reconstruction filter removes high-frequency signals
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.
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.
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.
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.
Applications
Portable DVD Players
Set-Top Boxes (STBs)
Portable Set-Top Boxes/
Personal Video Recorders (PVRs)
Portable Media Players (PMPs)
Portable Applications
FeaturesSmartSleep Feature Detects Input Signal and
Output Load Status to Reduce Power
ConsumptionTriple Standard-Definition Video Reconstruction
Filters with 6.75MHz PassbandLuma, Chroma, and Composite InputsLuma, Chroma, and Two Composite OutputsIntegrated Support for a Bidirectional Composite
Video SignalSupports Two Video Loads at Each Output
(DC-Coupled)2.7V to 3.6V Single-Supply Operation
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
Ordering Information
19-0531; Rev 2; 1/09
EVALUATION KIT
AVAILABLE
PARTPIN-PACKAGETOP MARK
MAX9508ATE+16 TQFN-EP*
(3mm x 3mm)AEM
Block Diagrams
Note:Device is specified over the -40°C to +125°C operating
temperature range.
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configurations appear at end of data sheet.
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
SHDN
INT/EXT
ACTIVE VIDEO
DETECT
SMARTSLEEP
CVBSIN
CVBSOUT2
LPF
CONTROL
LOGIC
CLAMP
BUFFERLOAD SENSE
6dB
LPF
BUFFERLOAD SENSE
BUFFER
6dB
LOAD SENSE
6dB
LOAD SENSE
6dB
LPF
MAX9508
Block Diagrams continued at end of data sheet.
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= VSHDN= 3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V, RL= No load. TA= TMINto TMAX, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
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.
(Voltages with respect to GND.)
VDD..........................................................................-0.3V to +4V
SMARTSLEEP, SHDN, INT/EXT
CIN, YIN, CVBSIN, EXTCVBSIN ..........................-0.3V to +4V
Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2
Short Circuit to VDDor GND..................................Continuous
Continuous Input Current
CIN, YIN, EXTCVBSIN, CVBSIN,
SMARTSLEEP, SHDN, INT/EXT....................................±20mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 15.6mW/°C above +70°C)..........1250mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVDDGuaranteed by PSRR2.73.6V
INT/E X T = G N D ( 4 channel s acti ve) ,
YIN = CVBSIN = 0.3V, CIN = 0.6V1316
INT/EXT = VDD (1 channel active),
EXTCVBSIN is unconnected4.36
SMARTSLEEP = VDD,
CVBSIN has no active video signal714
Supply CurrentIDD
SMARTSLEEP = VDD, CVBSIN has a black-
burst video signal with sync tip at GND
(Note 2)
Shutdown Supply CurrentISHDNVSHDN = GND0.0110µA
SMARTSLEEP CHARACTERISTICS
Minimum Line FrequencyCVBSIN14.3kHz
Sync Slice LevelCVBSIN4.15.2% VDD
Output Load Detect ThresholdSync pulse present, RL to GND200Ω
DC CHARACTERISTICS
2.7V < VDD < 3.6V01.05
Input-Voltage RangeVININ , Y IN , C V BS IN ,uar anteed b y outp ut
vol tag e sw i ng 3.0V < VDD < 3.6V01.2
Input CurrentIINCIN = YIN = CVBSIN = 0V25µA
Input ResistanceRINCIN, YIN, CVBSIN20MΩ
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VSHDN= 3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V, RL= No load. TA= TMINto TMAX, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Sync-Tip Clamp LevelVCLPEXTCVBSIN0.250.37V
Inp ut C l am p i ng C ur r entEXTCVBSIN = 500mV + VCLP0.511.5µA
2.7V < VDD < 3.6V1.05
EXTCVBSIN Input Voltage Range
Guaranteed by
output voltage
swing3.0V < VDD < 3.6V1.2
VP-P
Sync Crush
EXTCVBSIN, percentage reduction in sync
pulse (0.3VP-P), guaranteed by input
clamping current measurement, measured
at input
Maximum Input Source
ResistanceEXTCVBSIN300Ω
DC Voltage GainAVRL = 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V,
VDD = 2.7V5.766.3dB
DC Gain MatchingRL = 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V,
VDD = 2.7V-0.20+0.2dB
YIN = CVBSIN = CIN = 0V,
INT/EXT = GND, RL = 150Ω to GND0.210.30.38
Output LevelCEXTCVBSIN = 0.1µF to GND,
INT/EXT = VDD, RL = 150Ω to GND0.210.270.38
TA = -40°C to
+85°C2.0272.12.163Measured at output,
VDD = 2.7V,
0V ≤ VIN ≤ 1.05V,
RL = 150Ω to -0.2V
TA = -40°C to
+125°C2.0062.163
Measured at output, VDD = 2.7V,
0V ≤ VIN ≤ 1.05V, RL = 150Ω to VDD / 22.0272.12.163
TA = -40°C to
+85°C2.3162.42.472Measured at output,
VDD = 3V,
0V ≤ VIN ≤ 1.2V,
RL = 150Ω to -0.2V
TA = -40°C to
+125°C2.2922.472
Measured at output, VDD = 3V,
0V ≤ VIN ≤ 1.2V, RL = 150Ω to VDD / 22.3162.42.472
Output Voltage Swing
Measured at output, VDD = 3.135V,
0V ≤ VIN ≤ 1.05V, RL = 75Ω to -0.2V2.0272.12.163
VP-P
Output ResistanceROUTVOUT = 1.3V, -5mA ≤ ILOAD ≤ +5mA0.47Ω
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VSHDN= 3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V, RL= No load. TA= TMINto TMAX, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Power-Supply Rejection RatioPSRR2.7V ≤ VDD ≤ 3.6V, input referred,
RL = 150Ω to GND48dB
Output Pulldown ResistanceRPDINT/EXT = VDD, CVBSOUT13.7Ω
Output Shutdown Impedance28kΩ
LOGIC INPUTS (SMARTSLEEP, SHDN, INT/EXT)
Logic-Low ThresholdVIL0.3 x
VDDV
Logic-High ThresholdVIH0.7 x
VDDV
Logic Input CurrentIIL / IIHVI = 0V or VDD0.0110µA
AC ELECTRICAL CHARACTERISTICS
(VDD= VSHDN= 3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V, RL= 150Ωto GND. TA= TMINto TMAX, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
f = 5.5MHz-0.1
f = 6.75MHz-1-0.3+1
f = 11MHz-3
Standard-Definition
Reconstruction Filter
Inputs are 1VP-P, reference
frequency is 1MHz.
f = 27MHz-33-41
DC-coupled output,
5-step modulated staircase
f = 3.58MHz or
4.43MHz0.2
Differential GainDG
AC-coupled output,
5-step modulated staircase
f = 3.58MHz or
4.43MHz0.4
f = 3.58MHz0.62DC-coupled output,
5-step modulated staircasef = 4.43MHz0.75
f = 3.58MHz0.78Differential PhaseDP
AC-coupled output,
5-step modulated staircasef = 4.43MHz1.01eg r ees
2T Pulse Response2T = 200ns or 250ns0.2K%
2T Bar ResponseBar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time are ignored, 2T = 200ns or 250ns0.2K%
2T Pulse-to-Bar K
Rating
Bar time is 18µs, the beginning 2.5% and the ending 2.5%
of the bar time are ignored, 2T = 200ns or 250ns0.3K%
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
Note 1:All devices are 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design.
Note 2:Specified current is an average over time.
AC ELECTRICAL CHARACTERISTICS (continued)
(VDD= VSHDN= 3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V, RL= 150Ωto GND. TA= TMINto TMAX, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Nonlinearity5-step staircase0.1%
Interchannel Timing
Error
Difference in time between the 50% point of the output
signals, YOUT to COUT0.2ns
Group Delay
Distortion100kHz ≤ f ≤ 5MHz, inputs are 1VP-P10ns
Interchannel Group
Delay Distortion ErrorInputs are 1VP-P2ns
Peak Signal to RMS
Noise100kHz ≤ f ≤ 5MHz, inputs are 1VP-P67dB
Power-Supply
Rejection Ratiof = 100kHz, 200mVP-P, input referred43dB
Output Impedancef = 5MHz6Ω
Enable TimeYIN = 1V, output settled to within 1% of the final voltage,
RL = 150Ω to GND13µs
Disable TimeYIN = 1V, output settled to within 1% of the final voltage,
RL = 150Ω to GND1.1µs
CROSSTALK
All Hostile Output
Crosstalkf = 4.43MHz-70dB
All Hostile Input
Crosstalk
f = 4.43MHz, SHDN = GND,
input termination resistors are 75Ω-69dB
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
Typical Operating Characteristics
(VDD= VSHDN= +3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V. RL = 150Ωto GND. TA= +25°C, unless otherwise noted.)
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9508 toc01
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dB)
10M1M
100k100M
VOUT = 100mVP-P
NORMALIZED TO 1MHz
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9508 toc02
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dB)10M
100k100M
VOUT = 100mVP-P
NORMALIZED TO 1MHz
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9508 toc03
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dB)
10M1M
100k100M
VOUT = 2VP-P
NORMALIZED TO 1MHz
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9508 toc04
FREQUENCY (Hz)
OUTPUT AMPLITUDE (dB)10M
100k100M
VOUT = 2VP-P
NORMALIZED TO 1MHz
GROUP DELAY
MAX9508 toc05
FREQUENCY (Hz)
DELAY (ns)
10M1M
100k100M
VOUT = 2VP-P
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9508 toc06
FREQUENCY (Hz)
PSRR (dB)
10M1M100k
10k100M
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9508 toc07
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VOLTAGE GAIN
vs. TEMPERATURE
MAX9508 toc08
TEMPERATURE (°C)
VOLTAGE GAIN (V/V)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX9508 toc09
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
YIN, CIN, CVBSIN
INPUTS ONLY
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
DIFFERENTIAL GAIN AND PHASE
MAX9508 toc10
STEP
DIFFERENTIAL
PHASE (deg)
DIFFERENTIAL
GAIN (%)432
2T RESPONSE
MAX9508 toc11
100ns/div
VIN
200mV/div
VOUT
400mV/div
12.5T RESPONSE
MAX9508 toc12
400ns/div
YIN
200mV/div
YOUT
400mV/div
NTC-7 VIDEO TEST
SIGNAL ON CVBS OUTPUTS
MAX9508 toc13
10μs/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
PAL MULTIBURST RESPONSE
MAX9508 toc14
10μs/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
PAL COLOR BARS
MAX9508 toc15
10μs/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
FIELD SQUARE-WAVE RESPONSE
MAX9508 toc16
2ms/div
CVBSIN
500mV/div
CVBSOUT1
1V/div
ENABLE TIME
MAX9508 toc17
2μs/div
OUTPUT
1V/div
SHDN
1V/div
INPUT VOLTAGE = 1V
DISABLE TIME
MAX9508 toc18
200ns/div
OUTPUT
1V/div
SHDN
1V/div
INPUT VOLTAGE = 1V
Typical Operating Characteristics (continued)
(VDD= VSHDN= +3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V. RL = 150Ωto GND. TA= +25°C, unless otherwise noted.)
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
PULLDOWN RESISTANCE
DISTRIBUTION
MAX9508 toc19
PULLDOWN RESISTANCE (Ω)
PROBABILITY
PULLDOWN RESISTANCE
vs. TEMPERATURE
MAX9508 toc20
TEMPERATURE (°C)
PULLDOWN RESISTANCE (
FREQUENCY RESPONSE
AT 6.75MHz DISTRIBUTION
MAX9508 toc21
ATTENUATION (dB)
PROBABILITY
FREQUENCY RESPONSE
AT 27MHz DISTRIBUTION
MAX9508 toc22
ATTENUATION (dB)
PROBABILITY
INPUT-TO-INPUT CROSSTALK
vs. FREQUENCY
MAX9508 toc23
FREQUENCY (Hz)
CROSSTALK (dB)
10M1M
100k100M
OUTPUT-TO-OUTPUT CROSSTALK
vs. FREQUENCY
MAX9508 toc24
CROSSTALK (dB)
10M1M
100k100M
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX9508 toc25
OUTPUT IMPEDANCE (10M
100k100M
Typical Operating Characteristics (continued)
(VDD= VSHDN= +3.3V, VSMARTSLEEP= VINT/EXT= VGND= 0V. RL = 150Ωto GND. TA= +25°C, unless otherwise noted.)
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
Pin Description
PINNAMEFUNCTION
1, 13VDDPower Supply. Bypass VDD with a 0.1µF capacitor to ground.YINLuma Video Input. Directly connect this input to the video DAC output.
3, 8GNDGroundCVBSINInternal CVBS Signal Input. Directly connect this input to the video DAC output.EXTCVBSINExternal CVBS Signal Input. AC-couple the signal through a 0.1µF capacitor to this input.SHDNActive-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to
logic high for normal operation.N.C.No Connection. Connect to GND.CVBSOUT2CVBS Output 2CVBSOUT1CVBS Output 1. CVBSOUT1 is actively pulled to GND when INT/EXT is logic high.YOUTLuma Video OutputCOUTChroma Video OutputINT/EXTInternal/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.SMARTSLEEPSmartSleep Logic Input. Connect to logic high to activate SmartSleep operation.CINChroma Video Input. Directly connect this input to the video DAC output.EPExposed Pad. Connect EP to GND. EP is also internally connected to GND.
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
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.
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
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
75Ω
CURRENT
DAC
CURRENT
DAC
CURRENT
DAC
DVD CHIP
SVIDEO CHROMA
SVIDEO LUMA
TO Y/C SEPARATION
CVBS
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
INT/EXT
ACTIVE VIDEO
DETECT
CVBSIN
CVBSOUT2
LPF
CONTROL
LOGICMICROCONTROLLER
TO TFT LCD
TO TFT LCD
GND
+3.3V
0.1μF
VDD
CLAMP
BUFFERLOAD SENSE
6dB
75Ω
75Ω
75Ω
LPF
BUFFERLOAD SENSE
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
0.1μF
SHDN
SMARTSLEEP
+3.3V
Figure 1. Typical Application Circuit for Portable DVD Player
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
CVBS 1
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
CVBSIN
CVBSOUT2
LPF
GND
+3.3V
VDD
CLAMP
OFF
LOAD SENSE
6dB
75Ω
75Ω
LPF
BUFFERLOAD SENSE
BUFFER
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
7μA
SVIDEO
CHROMA
SVIDEO
LUMA
CURRENT
DAC
CURRENT
DAC
NO VIDEO
SIGNAL
CURRENT
DAC
VIDEO ENCODER
SHDN
INT/EXT
ACTIVE VIDEO
DETECT
SMARTSLEEPCONTROL
LOGIC
+3.3V
+3.3V
OFF
OFF
OFF
OFF
OFF
OFFOFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
CVBS 2
Figure 2. Standby Mode
outputs. If the SmartSleep feature is not activated and
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.
Standby Mode
In standby mode, the filters and output amplifiers are
off and only the active video detect circuit is opera-
tional. 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.
MAX9508
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 14.3kHz 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 15kΩpullup 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.
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
CVBS 1
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
CVBSIN
CVBSOUT2
LPF
GND
CLAMP
OFF
LOAD SENSE
6dB
75Ω
75Ω
LPF
BUFFERLOAD SENSE
BUFFER
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
SVIDEO
CHROMA
SVIDEO
LUMA
LOADS
CURRENT
DAC
CURRENT
DAC
VIDEO SIGNAL
PRESENT
CURRENT
DAC
VIDEO ENCODER
SHDN
INT/EXT
ACTIVE VIDEO
DETECT
SMARTSLEEPCONTROL
LOGIC
+3.3V
+3.3V
50mV
OFF
OFF
OFF
OFF
OFF
OFFOFF
OFF
OFF
OFF
CVBS 2
+3.3V
VDD
17μA
Figure 3. Active-Detect Mode with No Output Loads
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.
When an amplifier is on, it continually checks if the load
has been disconnected by detecting if the amplifier
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.
MAX9508
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
CVBSIN
CVBSOUT2
LPF
GND
CLAMP
OFF
LOAD SENSE
6dB
75Ω
75Ω
LPF
BUFFERLOAD SENSE
BUFFER
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
2.9mA QUIESCENT
SUPPLY CURRENT
PLUS
OUTPUT LOAD CURRENT
SVIDEO
CHROMA
SVIDEO
LUMA
CVBS1
75Ω
CURRENT
DAC
CURRENT
DAC
VIDEO SIGNAL
PRESENT
CURRENT
DAC
VIDEO ENCODER
SHDN
INT/EXT
ACTIVE VIDEO
DETECT
SMARTSLEEPCONTROL
LOGIC
+3.3V
+3.3V
50mV
OFF
OFFOFF
OFFOFF
OFF
OFF
CVBS 2
+3.3V
VDD
Figure 4. Full-Operation Mode with CVBSOUT1 Loaded

Partno	Mfg	Dc	Qty	Available	Descript
MAX9508ATE+T	MAXIM	N/a	1860	avai	Video Filter Amplifier with SmartSleep and Bidirectional Video Support