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19-0531; Rev 2; 1/09
KIT ATION EVALU ILABLE AVA
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
General Description Features
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 Video Signal Supports Two Video Loads at Each Output (DC-Coupled) 2.7V to 3.6V Single-Supply Operation
MAX9508
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 75, which is equivalent to two video loads, or it can be AC-coupled to a load of 150. 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 7A. 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 control 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 external 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 -40C to +125C automotive temperature range.
Ordering Information
PART MAX9508ATE+ PIN-PACKAGE 16 TQFN-EP* (3mm x 3mm) TOP MARK AEM
Note: Device is specified over the -40C to +125C operating temperature range. +Denotes lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
Block Diagrams
BUFFER CIN LPF BUFFER YIN LPF INT/EXT 6dB 6dB LOAD SENSE COUT
Applications
Portable DVD Players Set-Top Boxes (STBs) Portable Set-Top Boxes/ Personal Video Recorders (PVRs) Portable Media Players (PMPs) Portable Applications
LOAD SENSE YOUT
SMARTSLEEP SHDN
CONTROL LOGIC ACTIVE VIDEO DETECT
MAX9508
LOAD SENSE 6dB CVBSOUT1
CVBSIN BUFFER EXTCVBSIN CLAMP 6dB LPF LOAD SENSE CVBSOUT2
Pin Configurations appear at end of data sheet.
Block Diagrams continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
ABSOLUTE MAXIMUM RATINGS
(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 VDD or GND ..................................Continuous Continuous Input Current CIN, YIN, EXTCVBSIN, CVBSIN, SMARTSLEEP, SHDN, INT/EXT ....................................20mA Continuous Power Dissipation (TA = +70C) 16-Pin TQFN (derate 15.6mW/C above +70C)..........1250mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VDD CONDITIONS Guaranteed by PSRR INT/EXT = GND (4 channels active), YIN = CVBSIN = 0.3V, CIN = 0.6V INT/EXT = VDD (1 channel active), EXTCVBSIN is unconnected Supply Current IDD SMARTSLEEP = VDD, CVBSIN has no active video signal SMARTSLEEP = VDD, CVBSIN has a blackburst video signal with sync tip at GND (Note 2) Shutdown Supply Current SMARTSLEEP CHARACTERISTICS Minimum Line Frequency Sync Slice Level Output Load Detect Threshold DC CHARACTERISTICS Input-Voltage Range Input Current Input Resistance VIN IIN RIN CIN, YIN, CVBSIN, guaranteed by output voltage swing CIN, YIN, CVBSIN 2.7V < VDD < 3.6V 3.0V < VDD < 3.6V 0 0 2 20 1.05 V 1.2 5 A M CVBSIN CVBSIN Sync pulse present, RL to GND 14.3 4.1 5.2 200 kHz % VDD ISHDN VSHDN = GND MIN 2.7 13 4.3 7 TYP MAX 3.6 16 mA 6 14 A 17 0.01 10 A UNITS V
CIN = YIN = CVBSIN = 0V
2
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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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Sync-Tip Clamp Level Input Clamping Current EXTCVBSIN Input Voltage Range SYMBOL VCLP EXTCVBSIN EXTCVBSIN = 500mV + VCLP Guaranteed by output voltage swing 2.7V < VDD < 3.6V 3.0V < VDD < 3.6V CONDITIONS MIN 0.25 0.5 1 TYP MAX 0.37 1.5 1.05 VP-P 1.2 UNITS V A
MAX9508
Sync Crush
EXTCVBSIN, percentage reduction in sync pulse (0.3VP-P), guaranteed by input clamping current measurement, measured at input EXTCVBSIN AV RL = 150 to VDD/2, 0V VIN 1.05V, VDD = 2.7V RL = 150 to VDD/2, 0V VIN 1.05V, VDD = 2.7V YIN = CVBSIN = CIN = 0V, INT/EXT = GND, RL = 150 to GND CEXTCVBSIN = 0.1F to GND, INT/EXT = VDD, RL = 150 to GND Measured at output, VDD = 2.7V, 0V VIN 1.05V, RL = 150 to -0.2V TA = -40C to +85C TA = -40C to +125C 5.7 -0.2 0.21 0.21 2.027 2.006 2.027 2.316 2.292 2.316 2.027 2.4 2.1 0.47 2.1 2.4 300 6 0 0.3 0.27 2.1
2
%
Maximum Input Source Resistance DC Voltage Gain DC Gain Matching
6.3 +0.2 0.38 V 0.38 2.163 2.163 2.163 2.472 2.472 2.472 2.163 VP-P dB dB
Output Level
Measured at output, VDD = 2.7V, 0V VIN 1.05V, RL = 150 to VDD / 2 Output Voltage Swing Measured at output, VDD = 3V, 0V VIN 1.2V, RL = 150 to -0.2V TA = -40C to +85C TA = -40C to +125C
Measured at output, VDD = 3V, 0V VIN 1.2V, RL = 150 to VDD / 2 Measured at output, VDD = 3.135V, 0V VIN 1.05V, RL = 75 to -0.2V Output Resistance ROUT VOUT = 1.3V, -5mA ILOAD +5mA
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3
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Power-Supply Rejection Ratio Output Pulldown Resistance Output Shutdown Impedance LOGIC INPUTS (SMARTSLEEP, SHDN, INT/EXT) Logic-Low Threshold Logic-High Threshold Logic Input Current VIL VIH IIL / IIH VI = 0V or VDD 0.7 x VDD 0.01 10 0.3 x VDD V V A SYMBOL PSRR RPD CONDITIONS 2.7V VDD 3.6V, input referred, RL = 150 to GND INT/EXT = VDD, CVBSOUT1 MIN 48 3.7 28 TYP MAX UNITS dB k
AC ELECTRICAL CHARACTERISTICS
(VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = 150 to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Standard-Definition Reconstruction Filter SYMBOL CONDITIONS f = 5.5MHz Inputs are 1VP-P, reference frequency is 1MHz. f = 6.75MHz f = 11MHz f = 27MHz DC-coupled output, 5-step modulated staircase Differential Gain DG AC-coupled output, 5-step modulated staircase DC-coupled output, 5-step modulated staircase Differential Phase DP AC-coupled output, 5-step modulated staircase 2T Pulse Response 2T Bar Response 2T Pulse-to-Bar K Rating 2T = 200ns or 250ns Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns or 250ns Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns or 250ns f = 3.58MHz or 4.43MHz f = 3.58MHz f = 4.43MHz f = 3.58MHz f = 4.43MHz 0.4 0.62 0.75 0.78 1.01 0.2 0.2 0.3 K% K% K% Degrees f = 3.58MHz or 4.43MHz -33 -1 MIN TYP -0.1 -0.3 -3 -41 0.2 % +1 dB MAX UNITS
4
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
AC ELECTRICAL CHARACTERISTICS (continued)
(VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = 150 to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Nonlinearity Interchannel Timing Error Group Delay Distortion Interchannel Group Delay Distortion Error Peak Signal to RMS Noise Power-Supply Rejection Ratio Output Impedance Enable Time Disable Time CROSSTALK All Hostile Output Crosstalk All Hostile Input Crosstalk f = 4.43MHz f = 4.43MHz, SHDN = GND, input termination resistors are 75 -70 -69 dB dB SYMBOL 5-step staircase Difference in time between the 50% point of the output signals, YOUT to COUT 100kHz f 5MHz, inputs are 1VP-P Inputs are 1VP-P 100kHz f 5MHz, inputs are 1VP-P f = 100kHz, 200mVP-P, input referred f = 5MHz YIN = 1V, output settled to within 1% of the final voltage, RL = 150 to GND YIN = 1V, output settled to within 1% of the final voltage, RL = 150 to GND CONDITIONS MIN TYP 0.1 0.2 10 2 67 43 6 13 1.1 MAX UNITS % ns ns ns dB dB s s
MAX9508
Note 1: All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: Specified current is an average over time.
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5
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
Typical Operating Characteristics
(VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150 to GND. TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9508 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9508 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
10 OUTPUT AMPLITUDE (dB) 0 -10 -20 -30 -40 -50 -60 VOUT = 2VP-P NORMALIZED TO 1MHz
MAX9508 toc03
20 10 OUTPUT AMPLITUDE (dB) 0 -10 -20 -30 -40 -50 -60 100k 1M 10M VOUT = 100mVP-P NORMALIZED TO 1MHz
1.0 0.8 OUTPUT AMPLITUDE (dB) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 VOUT = 100mVP-P NORMALIZED TO 1MHz
20
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9508 toc04
GROUP DELAY
MAX9508 toc05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 PSRR (dB) -30 -40 -50
MAX9508 toc06
1.0 0.8 OUTPUT AMPLITUDE (dB) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 100k 1M 10M VOUT = 2VP-P NORMALIZED TO 1MHz
150 VOUT = 2VP-P 125 100 DELAY (ns) 75 50 25 0 -25
0
-60 -70 -80 100k 1M 10M 100M 10k 100k 1M FREQUENCY (Hz) 10M 100M FREQUENCY (Hz)
100M
FREQUENCY (Hz)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX9508 toc07
VOLTAGE GAIN vs. TEMPERATURE
MAX9508 toc08
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5 3.0 OUTPUT VOLTAGE (V) YIN, CIN, CVBSIN INPUTS ONLY
MAX9508 toc09
14.0 13.5 SUPPLY CURRENT (mA) 13.0 12.5 12.0 11.5 11.0 -50 -25 0 25 50 75 100
2.02 2.01 VOLTAGE GAIN (V/V) 2.00 1.99 1.98 1.97 1.96 1.95
4.0
2.5 2.0 1.5 1.0 0.5 0 -0.5
125
-50
-25
0
25
50
75
100
125
-0.5
0
0.5
1.0
1.5
2.0
TEMPERATURE (C)
TEMPERATURE (C)
INPUT VOLTAGE (V)
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Typical Operating Characteristics (continued)
(VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150 to GND. TA = +25C, unless otherwise noted.)
MAX9508
DIFFERENTIAL GAIN AND PHASE
0.3 0.2 0.1 0 -0.1 -0.2 -0.3 0.8 DIFFERENTIAL PHASE (deg) 0.4 0 -0.4 -0.8 1 2 3 4 STEP 5 6 7 DIFFERENTIAL GAIN (%)
MAX9508 toc10
2T RESPONSE
MAX9508 toc11
12.5T RESPONSE
MAX9508 toc12
VIN 200mV/div 1 2 3 4 5 6 7
YIN 200mV/div
VOUT 400mV/div
YOUT 400mV/div
100ns/div
400ns/div
NTC-7 VIDEO TEST SIGNAL ON CVBS OUTPUTS
MAX9508 toc13
PAL MULTIBURST RESPONSE
MAX9508 toc14
PAL COLOR BARS
MAX9508 toc15
CVBSIN 500mV/div
CVBSIN 500mV/div
CVBSIN 500mV/div
CVBSOUT1 1V/div
CVBSOUT1 1V/div
CVBSOUT1 1V/div
10s/div
10s/div
10s/div
FIELD SQUARE-WAVE RESPONSE
MAX9508 toc16
ENABLE TIME
MAX9508 toc17
DISABLE TIME
MAX9508 toc18
INPUT VOLTAGE = 1V CVBSIN 500mV/div OUTPUT 1V/div
INPUT VOLTAGE = 1V OUTPUT 1V/div
CVBSOUT1 1V/div
SHDN 1V/div
SHDN 1V/div
2ms/div
2s/div
200ns/div
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
Typical Operating Characteristics (continued)
(VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150 to GND. TA = +25C, unless otherwise noted.)
PULLDOWN RESISTANCE vs. TEMPERATURE
MAX9508 toc20 MAX9508 toc19
PULLDOWN RESISTANCE DISTRIBUTION
7.0 6.5 PULLDOWN RESISTANCE () 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 PULLDOWN RESISTANCE () -50 -25
FREQUENCY RESPONSE AT 6.75MHz DISTRIBUTION
MAX9508 toc21
PROBABILITY
0
25
50
75
100
125
PROBABILITY -0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
TEMPERATURE (C)
ATTENUATION (dB)
FREQUENCY RESPONSE AT 27MHz DISTRIBUTION
MAX9508 toc22
INPUT-TO-INPUT CROSSTALK vs. FREQUENCY
MAX9508 toc23
0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120
PROBABILITY
-52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32 ATTENUATION (dB)
100k
1M
10M
100M
FREQUENCY (Hz)
OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY
MAX9508 toc24
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9508 toc25
0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120 100k 1M 10M
100
OUTPUT IMPEDANCE () 100M
10
1
0.1 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz)
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Pin Description
PIN 1, 13 2 3, 8 4 5 6 7 9 10 11 12 14 15 16 EP NAME VDD YIN GND CVBSIN EXTCVBSIN SHDN N.C. CVBSOUT2 CVBSOUT1 YOUT COUT INT/EXT SMARTSLEEP CIN EP FUNCTION Power Supply. Bypass VDD with a 0.1F capacitor to ground. Luma Video Input. Directly connect this input to the video DAC output. Ground Internal CVBS Signal Input. Directly connect this input to the video DAC output. External CVBS Signal Input. AC-couple the signal through a 0.1F capacitor to this input. Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to logic high for normal operation. No Connection. Connect to GND. CVBS Output 2 CVBS Output 1. CVBSOUT1 is actively pulled to GND when INT/EXT is logic high. Luma Video Output 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. SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation. 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.
MAX9508
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
+3.3V
0.1F VDD DVD CHIP BUFFER CURRENT DAC CIN LPF 6dB LOAD SENSE COUT 75 SVIDEO CHROMA 75 TO TFT LCD BUFFER CURRENT DAC YIN LPF 6dB LOAD SENSE YOUT 75 SVIDEO LUMA 75 TO TFT LCD
INT/EXT SMARTSLEEP MICROCONTROLLER +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP 6dB 0.1F GND LPF LOAD SENSE CVBSOUT2 75 TO Y/C SEPARATION LOAD SENSE CVBSOUT1 75 CVBS CONTROL LOGIC
MAX9508
Figure 1. Typical Application Circuit for Portable DVD Player
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 75 back termination resistor. When external video sources are selected, the MAX9508 selects the external composite video signal (EXTCVBSIN), filters, and amplifies it. The output stages of the amplifiers connected to
COUT, YOUT, and CVBSOUT1 become high impedance. 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
10
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
outputs. If the SmartSleep feature is not activated and the part is not in shutdown, the filters and output amplifiers 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 operational. Quiescent current consumption is approximately 7A (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
+3.3V
7A VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF OFF OFF 6dB OFF LOAD SENSE OFF LPF OFF OFF 6dB OFF YOUT 75 SVIDEO LUMA LOAD SENSE OFF COUT 75 SVIDEO CHROMA
BUFFER CURRENT DAC YIN
INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF LPF OFF 6dB OFF GND LOAD SENSE OFF CVBSOUT2 75 CVBS 2 OFF LOAD SENSE OFF CVBSOUT1 75 CVBS 1 CONTROL LOGIC
MAX9508
+3.3V NO VIDEO SIGNAL
OFF
Figure 2. Standby Mode
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11
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
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 17A.
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 15k pullup resistor to the output for 1ms. If the output is pulled up, then no load is present. If the output stays low, a load is connected.
+3.3V
17A VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF OFF OFF 6dB OFF LOAD SENSE LPF OFF OFF 6dB OFF YOUT 75 SVIDEO LUMA LOAD SENSE COUT 75 SVIDEO CHROMA
BUFFER CURRENT DAC YIN
INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF LPF OFF 6dB OFF GND LOAD SENSE CVBSOUT2 75 CVBS 2 OFF LOAD SENSE CVBSOUT1 75 CVBS 1 CONTROL LOGIC
MAX9508
NO LOADS
+3.3V VIDEO SIGNAL PRESENT 0 TO 50mV
OFF
Figure 3. Active-Detect Mode with No Output Loads
12
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Full-Operation Mode If a load is connected to an output, the corresponding filter and amplifier turn on and remain on until the output 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 64s), the load has been disconnected 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 connected at the outputs.
MAX9508
+3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF OFF OFF 6dB OFF LOAD SENSE LPF OFF OFF 6dB OFF YOUT 75 SVIDEO LUMA LOAD SENSE COUT 75 SVIDEO CHROMA
BUFFER CURRENT DAC YIN
INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF 6dB OFF GND LPF LOAD SENSE CVBSOUT2 75 CVBS 2 75 LOAD SENSE CVBSOUT1 75 CVBS1 CONTROL LOGIC
MAX9508
+3.3V VIDEO SIGNAL PRESENT 0 TO 50mV
Figure 4. Full-Operation Mode with CVBSOUT1 Loaded
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
+3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF OFF OFF 6dB OFF LOAD SENSE LPF OFF OFF 6dB OFF YOUT 75 SVIDEO LUMA LOAD SENSE COUT 75 SVIDEO CHROMA
BUFFER CURRENT DAC YIN
INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF 6dB LPF LOAD SENSE CVBSOUT2 75 CVBS2 OFF LOAD SENSE CVBSOUT1 75 CVBS 1 CONTROL LOGIC
MAX9508
+3.3V VIDEO SIGNAL PRESENT 0 TO 50mV
75 GND
Figure 5. Full-Operation Mode with CVBSOUT2 Loaded
14
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
+3.3V 10.5mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO ENCODER BUFFER CURRENT DAC CIN LPF 6dB LOAD SENSE COUT 75 SVIDEO CHROMA
75 LOAD SENSE LPF 6dB YOUT 75 SVIDEO LUMA
BUFFER CURRENT DAC YIN
75 INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF 6dB LPF LOAD SENSE CVBSOUT2 75 CVBS2 75 LOAD SENSE CVBSOUT1 75 CVBS1 CONTROL LOGIC
MAX9508
+3.3V VIDEO SIGNAL PRESENT 0 TO 50mV
75 GND
Figure 6. Full-Operation Mode with All Outputs Loaded
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15
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
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
source such as a DVD chip (Figure 7). The 2:1 multiplexer selects the video signal on CVBSIN. The EXTCVBSIN video signal is ignored.
+3.3V
13mA QUIESCENT SUPPLY CURRENT VDD DVD CHIP BUFFER CURRENT DAC CIN LPF
0.1F
75 TO TFT LCD LOAD SENSE 6dB COUT 75 SVIDEO CHROMA 75 TO TFT LCD
BUFFER CURRENT DAC LOGIC LOW INT/EXT MICROCONTROLLER +3.3V SMARTSLEEP SHDN ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP OFF 0.1F GND LPF CONTROL LOGIC YIN LPF 6dB
LOAD SENSE YOUT 75 SVIDEO LUMA
MAX9508
LOAD SENSE CVBSOUT1 75 CVBS
LOAD SENSE 6dB CVBSOUT2 75 TO Y/C SEPARATION
Figure 7. Internal Mode Operation for Portable DVD Applications
16
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
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 signals 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.
MAX9508
+3.3V 4.3mA QUIESCENT SUPPLY CURRENT VDD DVD CHIP BUFFER CURRENT DAC CIN LPF OFF OFF 6dB OFF LOAD SENSE OFF LPF OFF LOGIC HIGH INT/EXT MICROCONTROLLER 0V OR SMARTSLEEP +3.3V SHDN +3.3V CONTROL LOGIC OFF 6dB OFF YOUT 75 SVIDEO LUMA LOAD SENSE OFF COUT 75 SVIDEO CHROMA 75 TO TFT LCD BUFFER CURRENT DAC YIN 75 TO TFT LCD
MAX9508
ACTIVE VIDEO DETECT 6dB CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP 6dB 0.1F GND LPF OFF
LOAD SENSE OFF CVBSOUT1 75 CVBS 75 VIDEO SOURCE
LOAD SENSE CVBSOUT2 75 TO Y/C SEPARATION
Figure 8. External Mode Operation for Portable DVD Applications
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17
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
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 signals 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 signal is between ground and 1.05V when VDD = 2.7V. For example, three composite video signals could be
applied to YIN, CIN, and CVBSIN. The RGB set and the YPbPr set can also be inputs to YIN, CIN, and CVBSIN (Figure 9). 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 0.1F 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.
+3.3V
0.1F VDD VIDEO ENCODER Pr/R CURRENT DAC BUFFER CIN LPF 6dB LOAD SENSE COUT 75 Pr/R
Pb/B CURRENT DAC YIN
BUFFER LPF 6dB
LOAD SENSE YOUT 75 Pb/B
INT/EXT SMARTSLEEP +3.3V SHDN ACTIVE VIDEO DETECT Y/G CURRENT DAC CVBSIN BUFFER EXTCVBSIN CLAMP 6dB LPF LOAD SENSE CVBSOUT2 75 Y/G 6dB LOAD SENSE CVBSOUT1 75 Y/G CONTROL LOGIC
MAX9508
+3.3V
GND
Figure 9. Y, Pr, Pb or RGB Set Applied to MAX9508
18 ______________________________________________________________________________________
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Video Reconstruction Filter
The MAX9508 filter passband is 6.75MHz, which makes the device suitable for the higher bandwidth video signals from a DVD chip. Broadcast video signals actually require less bandwidth because of channel limitations: NTSC signals have a 4.2MHz bandwidth, and PAL signals 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 standarddefinition video). Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz.
Applications Information
Reducing Power Consumption in the Video DACs
YIN, CIN, and CVBSIN have high-impedance input buffers and can work with source resistances as high as 300. 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 37.5, the DAC must source 26.7mA when the output is 1V. If the output resistor is increased to 300, 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 output resistor forms a pole that can potentially roll off the frequency response of the video signal. For example, 300 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.
MAX9508
Outputs
The video output amplifiers can both source and sink load current, allowing output loads to be DC- or ACcoupled. 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 output is positioned at approximately 1.5V if the blank level of the chroma input signal is 0.6V. If the supply voltage is greater than 3.135V (5% below a 3.3V supply), each amplifier can drive two DC-coupled 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.
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 220F or greater to keep the highpass filter formed by the 150 equivalent resistance of the video transmission line to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is 25Hz, and the frame rate of NTSC systems is 30Hz. The corner frequency should be well below the frame rate. SmartSleep only works with DC-coupled loads.
Shutdown
When SHDN is low, the MAX9508 draws typically less than 10nA supply current. All the amplifier outputs become high impedance. The effective output resistance at the video outputs is 28k, due to the internal feedback resistors to ground.
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19
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
+3.3V
0.1F VDD SET-TOP BOX CHIP BUFFER CURRENT DAC CIN LPF 6dB LOAD SENSE COUT 75 220F SVIDEO CHROMA
BUFFER CURRENT DAC YIN LPF 6dB
LOAD SENSE YOUT 75 220F SVIDEO LUMA
INT/EXT SMARTSLEEP CONTROL LOGIC
MAX9508
+3.3V
SHDN ACTIVE VIDEO DETECT 6dB CVBSIN BUFFER EXTCVBSIN LPF CLAMP OFF 6dB LOAD SENSE CVBSOUT2 75 220F CVBS 2 LOAD SENSE CVBSOUT1 75 220F CVBS 1
CURRENT DAC
GND
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 VDD to GND with a 0.1F capacitor. Place all external components as close to the device as possible.
20
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Block Diagrams (continued)
MAX9508
BUFFER CIN LPF 6dB
LOAD SENSE COUT
BUFFER YIN LPF 6dB
LOAD SENSE YOUT
INT/EXT SMARTSLEEP SHDN ACTIVE VIDEO DETECT 6dB CVBSIN BUFFER LPF LOAD SENSE CLAMP 6dB CVBSOUT2 300mV TO 400mV CVBSOUT1 CONTROL LOGIC
MAX9508
0 TO 50mV
LOAD SENSE
EXTCVBSIN
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21
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
Pin Configuration
PROCESS: BiCMOS
CVBSOUT1 COUT YOUT
Chip Information
TOP VIEW
12 VDD 13 INT/EXT 14 SMARTSLEEP 15 CIN 16
11
10
CVBSOUT2 9 8 7 GND N.C. SHDN EXTCVBSIN 6 5 4 CVBSIN
MAX9508
+
1 VDD 2 YIN 3 GND
THIN QFN (3mm x 3mm)
22
______________________________________________________________________________________
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 16 TQFN-EP PACKAGE CODE T1633-4 DOCUMENT NO. 21-0136
MAX9508
MARKING
E E/2
(ND - 1) X e
(NE - 1) X e
D2/2
D/2 D
AAAA
C L
e D2
k
b E2/2
0.10 M C A B
C L
L
E2
0.10 C
0.08 C A A2 A1 L
C L
C L
L
e
e
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
1 2
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23
12x16L QFN THIN.EPS
CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
MAX9508
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.)
PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 0.35
8L 3x3 MIN. NOM. MAX. 0.70 0.25 2.90 2.90 0.75 0.30 3.00 3.00 0.55 8 2 2 0.02 0.20 REF 0.25 0.05 0 0.80 0.35 3.10 3.10 0.75
12L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.45 0.75 0.25 3.00 3.00 0.50 BSC. 0.55 12 3 3 0.02 0.20 REF 0.25 0.05 0 0.65 0.30 0.80 0.30 3.10 3.10
16L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.75 0.25 3.00 3.00 0.40 16 4 4 0.02 0.20 REF 0.05 0.80 0.30 3.10 3.10 0.50 PKG. CODES TQ833-1 T1233-1 T1233-3 T1233-4 T1633-2 T1633F-3 T1633FH-3 T1633-4 T1633-5
EXPOSED PAD VARIATIONS
D2 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 E2 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 PIN ID 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.225 x 45 0.225 x 45 0.35 x 45 0.35 x 45 JEDEC WEEC WEED-1 WEED-1 WEED-1 WEED-2 WEED-2 WEED-2 WEED-2 WEED-2
0.65 BSC.
0.50 BSC.
NOTES: 1. 2. 3. 4. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. 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. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS . DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm.
5. 6. 7. 8. 9. 10. 11. 12.
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
2 2
24
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CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support
Revision History
REVISION NUMBER 2 REVISION DATE 1/09 Removed QSOP package DESCRIPTION PAGES CHANGED 1, 2, 9, 22
MAX9508
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
(c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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