19-0531; Rev 2; 1/09 KIT ATION EVALU E L B A IL AVA CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 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 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 -40°C to +125°C automotive temperature range. Applications 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 Ordering Information PART PIN-PACKAGE TOP MARK 16 TQFN-EP* (3mm x 3mm) AEM MAX9508ATE+ Note: Device is specified over the -40°C to +125°C operating temperature range. +Denotes lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Block Diagrams LOAD SENSE BUFFER CIN LOAD SENSE BUFFER YIN YOUT 6dB LPF Portable DVD Players COUT 6dB LPF INT/EXT Set-Top Boxes (STBs) Portable Set-Top Boxes/ Personal Video Recorders (PVRs) SMARTSLEEP MAX9508 LOAD SENSE ACTIVE VIDEO DETECT Portable Media Players (PMPs) Portable Applications CONTROL LOGIC SHDN CVBSOUT1 6dB CVBSIN BUFFER LPF EXTCVBSIN LOAD SENSE CLAMP 6dB Pin Configurations appear at end of data sheet. CVBSOUT2 Block Diagrams continued at end of data sheet. ________________________________________________________________ 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. 1 MAX9508 General Description MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 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 = +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 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 = +25°C.) (Note 1) PARAMETER SYMBOL Supply Voltage Range Supply Current VDD IDD CONDITIONS Guaranteed by PSRR MIN ISHDN MAX UNITS 3.6 V INT/EXT = GND (4 channels active), YIN = CVBSIN = 0.3V, CIN = 0.6V 13 INT/EXT = VDD (1 channel active), EXTCVBSIN is unconnected 4.3 6 SMARTSLEEP = VDD, CVBSIN has no active video signal 7 14 16 mA µA SMARTSLEEP = VDD, CVBSIN has a blackburst video signal with sync tip at GND (Note 2) Shutdown Supply Current TYP 2.7 17 VSHDN = GND 0.01 10 µA 5.2 % VDD 200 Ω SMARTSLEEP CHARACTERISTICS Minimum Line Frequency CVBSIN 14.3 Sync Slice Level CVBSIN 4.1 Output Load Detect Threshold Sync pulse present, RL to GND kHz DC CHARACTERISTICS Input-Voltage Range VIN CIN, YIN, CVBSIN, guaranteed by output voltage swing 2.7V < VDD < 3.6V 0 1.05 3.0V < VDD < 3.6V 0 1.2 V Input Current IIN CIN = YIN = CVBSIN = 0V 2 Input Resistance RIN CIN, YIN, CVBSIN 20 2 _______________________________________________________________________________________ 5 µA MΩ CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support (VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Sync-Tip Clamp Level SYMBOL VCLP CONDITIONS MIN EXTCVBSIN 0.25 Input Clamping Current EXTCVBSIN = 500mV + VCLP 0.5 EXTCVBSIN Input Voltage Range Guaranteed by output voltage swing Output Resistance 2 % Ω 300 RL = 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V, VDD = 2.7V 5.7 6 6.3 dB RL = 150Ω to VDD/2, 0V ≤ VIN ≤ 1.05V, VDD = 2.7V -0.2 0 +0.2 dB YIN = CVBSIN = CIN = 0V, INT/EXT = GND, RL = 150Ω to GND 0.21 0.3 0.38 CEXTCVBSIN = 0.1µF to GND, INT/EXT = VDD, RL = 150Ω to GND 0.21 0.27 0.38 TA = -40°C to +85°C 2.027 2.1 2.163 TA = -40°C to +125°C 2.006 Measured at output, VDD = 2.7V, 0V ≤ VIN ≤ 1.05V, RL = 150Ω to VDD / 2 2.027 2.1 2.163 TA = -40°C to +85°C 2.316 2.4 2.472 TA = -40°C to +125°C 2.292 Measured at output, VDD = 3V, 0V ≤ VIN ≤ 1.2V, RL = 150Ω to -0.2V ROUT µA VP-P Measured at output, VDD = 2.7V, 0V ≤ VIN ≤ 1.05V, RL = 150Ω to -0.2V Output Voltage Swing 1.5 1.2 EXTCVBSIN Output Level V 3.0V < VDD < 3.6V Maximum Input Source Resistance DC Gain Matching UNITS 0.37 1.05 Sync Crush AV 1 MAX 2.7V < VDD < 3.6V EXTCVBSIN, percentage reduction in sync pulse (0.3VP-P), guaranteed by input clamping current measurement, measured at input DC Voltage Gain TYP V 2.163 2.472 Measured at output, VDD = 3V, 0V ≤ VIN ≤ 1.2V, RL = 150Ω to VDD / 2 2.316 2.4 2.472 Measured at output, VDD = 3.135V, 0V ≤ VIN ≤ 1.05V, RL = 75Ω to -0.2V 2.027 2.1 2.163 VOUT = 1.3V, -5mA ≤ ILOAD ≤ +5mA VP-P 0.47 Ω _______________________________________________________________________________________ 3 MAX9508 ELECTRICAL CHARACTERISTICS (continued) 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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Power-Supply Rejection Ratio Output Pulldown Resistance PSRR RPD CONDITIONS 2.7V ≤ VDD ≤ 3.6V, input referred, RL = 150Ω to GND MIN TYP MAX 48 UNITS dB INT/EXT = VDD, CVBSOUT1 Output Shutdown Impedance 3.7 Ω 28 kΩ LOGIC INPUTS (SMARTSLEEP, SHDN, INT/EXT) Logic-Low Threshold VIL Logic-High Threshold VIH Logic Input Current IIL / IIH 0.3 x VDD 0.7 x VDD VI = 0V or VDD V V 0.01 10 µA AC ELECTRICAL CHARACTERISTICS (VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = 150Ω to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN f = 5.5MHz Standard-Definition Reconstruction Filter Inputs are 1VP-P, reference frequency is 1MHz. f = 6.75MHz Differential Gain Differential Phase MAX UNITS -0.1 -1 f = 11MHz f = 27MHz TYP -0.3 -3 -33 +1 dB -41 DC-coupled output, 5-step modulated staircase f = 3.58MHz or 4.43MHz 0.2 AC-coupled output, 5-step modulated staircase f = 3.58MHz or 4.43MHz 0.4 DC-coupled output, 5-step modulated staircase f = 3.58MHz 0.62 f = 4.43MHz 0.75 AC-coupled output, 5-step modulated staircase f = 3.58MHz 0.78 f = 4.43MHz 1.01 DG % DP Degrees 2T Pulse Response 2T = 200ns or 250ns 0.2 K% 2T Bar Response Bar time is 18µs, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns or 250ns 0.2 K% 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 250ns 0.3 K% 4 _______________________________________________________________________________________ CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support (VDD = VSHDN = 3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V, RL = 150Ω to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Nonlinearity 5-step staircase 0.1 % Interchannel Timing Error Difference in time between the 50% point of the output signals, YOUT to COUT 0.2 ns Group Delay Distortion 100kHz ≤ f ≤ 5MHz, inputs are 1VP-P 10 ns Interchannel Group Delay Distortion Error Inputs are 1VP-P 2 ns Peak Signal to RMS Noise 100kHz ≤ f ≤ 5MHz, inputs are 1VP-P 67 dB Power-Supply Rejection Ratio f = 100kHz, 200mVP-P, input referred 43 dB Output Impedance f = 5MHz 6 Ω Enable Time YIN = 1V, output settled to within 1% of the final voltage, RL = 150Ω to GND 13 µs Disable Time YIN = 1V, output settled to within 1% of the final voltage, RL = 150Ω to GND 1.1 µs All Hostile Output Crosstalk f = 4.43MHz -70 dB All Hostile Input Crosstalk f = 4.43MHz, SHDN = GND, input termination resistors are 75Ω -69 dB CROSSTALK 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. _______________________________________________________________________________________ 5 MAX9508 AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150Ω to GND. TA = +25°C, unless otherwise noted.) SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY -10 -20 -30 -40 0.4 0.2 0 -0.2 -0.4 -0.6 -50 -1.0 100k 1M -20 -30 -40 10M 100M 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY GROUP DELAY POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0.6 VOUT = 2VP-P 0 125 -10 -20 DELAY (ns) 0.2 0 -0.2 PSRR (dB) 100 0.4 MAX9508 toc06 VOUT = 2VP-P NORMALIZED TO 1MHz MAX9508 toc05 150 MAX9508 toc04 1.0 0.8 -10 -60 1M 100k 100M 10M 0 -50 -0.8 -60 75 50 -30 -40 -50 -0.4 25 -60 -0.6 0 -0.8 -70 -25 -1.0 100k 1M 10M -80 100k 100M 1M 100M 10M 10k 100k 1M 10M FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE VOLTAGE GAIN vs. TEMPERATURE OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.01 12.5 12.0 2.00 OUTPUT VOLTAGE (V) 13.0 3.5 YIN, CIN, CVBSIN INPUTS ONLY 3.0 VOLTAGE GAIN (V/V) 13.5 4.0 MAX9508 toc08 2.02 MAX9508 toc07 14.0 1.99 1.98 1.97 100M MAX9508 toc09 OUTPUT AMPLITUDE (dB) 0.6 VOUT = 2VP-P NORMALIZED TO 1MHz 10 OUTPUT AMPLITUDE (dB) OUTPUT AMPLITUDE (dB) OUTPUT AMPLITUDE (dB) 0 VOUT = 100mVP-P NORMALIZED TO 1MHz 0.8 20 MAX9508 toc02 VOUT = 100mVP-P NORMALIZED TO 1MHz 10 1.0 MAX9508 toc01 20 LARGE-SIGNAL GAIN vs. FREQUENCY MAX9508 toc03 SMALL-SIGNAL GAIN vs. FREQUENCY SUPPLY CURRENT (mA) MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 2.5 2.0 1.5 1.0 0.5 11.5 1.96 11.0 1.95 -50 -25 0 25 50 75 TEMPERATURE (°C) 6 100 125 0 -0.5 -50 -25 0 25 50 75 TEMPERATURE (°C) 100 125 -0.5 0 0.5 1.0 INPUT VOLTAGE (V) _______________________________________________________________________________________ 1.5 2.0 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support MAX9508 toc12 MAX9508 toc11 MAX9508 toc10 DIFFERENTIAL GAIN (%) 12.5T RESPONSE 2T RESPONSE DIFFERENTIAL GAIN AND PHASE 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 2 3 4 5 6 VIN 200mV/div YIN 200mV/div VOUT 400mV/div YOUT 400mV/div 7 DIFFERENTIAL PHASE (deg) 0.8 0.4 0 -0.4 -0.8 1 2 3 4 5 6 7 400ns/div 100ns/div STEP NTC-7 VIDEO TEST SIGNAL ON CVBS OUTPUTS PAL MULTIBURST RESPONSE PAL COLOR BARS MAX9508 toc14 MAX9508 toc13 CVBSIN 500mV/div CVBSOUT1 1V/div MAX9508 toc15 CVBSIN 500mV/div CVBSIN 500mV/div CVBSOUT1 1V/div CVBSOUT1 1V/div 10μs/div 10μs/div FIELD SQUARE-WAVE RESPONSE 10μs/div DISABLE TIME ENABLE TIME MAX9508 toc16 MAX9508 toc18 MAX9508 toc17 INPUT VOLTAGE = 1V INPUT VOLTAGE = 1V 2ms/div CVBSIN 500mV/div OUTPUT 1V/div OUTPUT 1V/div CVBSOUT1 1V/div SHDN 1V/div SHDN 1V/div 2μs/div 200ns/div _______________________________________________________________________________________ 7 MAX9508 Typical Operating Characteristics (continued) (VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150Ω to GND. TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = VSHDN = +3.3V, VSMARTSLEEP = VINT/EXT = VGND = 0V. RL = 150Ω to GND. TA = +25°C, unless otherwise noted.) PULLDOWN RESISTANCE vs. TEMPERATURE PULLDOWN RESISTANCE DISTRIBUTION FREQUENCY RESPONSE AT 6.75MHz DISTRIBUTION 6.0 5.5 PROBABILITY PULLDOWN RESISTANCE (Ω) 6.5 MAX9508 toc21 MAX9508 toc20 MAX9508 toc19 7.0 PROBABILITY 5.0 4.5 4.0 3.5 3.0 2.5 2.0 -50 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -25 0 25 50 75 100 125 -0.6 -0.5 TEMPERATURE (°C) PULLDOWN RESISTANCE (Ω) -0.4 -0.3 -0.2 ATTENUATION (dB) INPUT-TO-INPUT CROSSTALK vs. FREQUENCY FREQUENCY RESPONSE AT 27MHz DISTRIBUTION -20 CROSSTALK (dB) PROBABILITY MAX9508 toc23 MAX9508 toc22 0 -40 -60 -80 -100 -120 100k -52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32 1M 10M ATTENUATION (dB) FREQUENCY (Hz) OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY OUTPUT IMPEDANCE (Ω) -20 -40 -60 -80 100M MAX9508 toc25 100 MAX9508 toc24 0 CROSSTALK (dB) MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 10 1 -100 -120 0.1 100k 1M 10M FREQUENCY (Hz) 8 100M 100k 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 100M -0.1 0 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support PIN NAME 1, 13 VDD 2 YIN 3, 8 GND 4 CVBSIN 5 EXTCVBSIN 6 SHDN 7 N.C. 9 CVBSOUT2 10 CVBSOUT1 11 YOUT 12 COUT FUNCTION Power Supply. Bypass VDD with a 0.1µF 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 0.1µF 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. 14 INT/EXT 15 SMARTSLEEP 16 CIN Chroma Video Input. Directly connect this input to the video DAC output. EP EP Exposed Pad. Connect EP to GND. EP is also internally connected to GND. SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation. _______________________________________________________________________________________ 9 MAX9508 Pin Description MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support +3.3V 0.1μF VDD 75Ω DVD CHIP TO TFT LCD LOAD SENSE BUFFER CIN CURRENT DAC COUT 6dB LPF 75Ω SVIDEO CHROMA 75Ω TO TFT LCD LOAD SENSE BUFFER YIN CURRENT DAC YOUT 6dB LPF 75Ω SVIDEO LUMA INT/EXT SMARTSLEEP +3.3V MAX9508 CONTROL LOGIC MICROCONTROLLER SHDN ACTIVE VIDEO DETECT LOAD SENSE CVBSOUT1 6dB 75Ω CVBS CVBSIN CURRENT DAC BUFFER LPF EXTCVBSIN LOAD SENSE CLAMP 6dB CVBSOUT2 75Ω TO Y/C SEPARATION 0.1μF GND 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 75Ω 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 10 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 ______________________________________________________________________________________ CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support +3.3V 7μA VDD VIDEO ENCODER LOAD SENSE BUFFER OFF CIN CURRENT DAC 6dB LPF OFF 75Ω SVIDEO CHROMA OFF OFF LOAD SENSE BUFFER OFF YIN CURRENT DAC COUT 6dB LPF OFF YOUT 75Ω SVIDEO LUMA OFF OFF INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT OFF 6dB CVBSIN CURRENT DAC NO VIDEO SIGNAL EXTCVBSIN OFF CLAMP OFF 75Ω CVBS 1 OFF BUFFER +3.3V CVBSOUT1 LPF LOAD SENSE OFF OFF 6dB CVBSOUT2 75Ω CVBS 2 OFF GND Figure 2. Standby Mode ______________________________________________________________________________________ 11 MAX9508 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 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. 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. MAX9508 CVBS/S-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 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 15kΩ 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 17μA VDD VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC OFF 75Ω SVIDEO CHROMA OFF OFF LOAD SENSE BUFFER YIN CURRENT DAC COUT 6dB LPF OFF YOUT 6dB LPF 75Ω SVIDEO LUMA OFF OFF INT/EXT +3.3V NO LOADS MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB CVBSIN CURRENT DAC VIDEO SIGNAL PRESENT EXTCVBSIN OFF CLAMP OFF 0 TO 50mV CVBS 1 OFF BUFFER +3.3V 75Ω LPF LOAD SENSE OFF 6dB CVBSOUT2 75Ω OFF GND Figure 3. Active-Detect Mode with No Output Loads 12 ______________________________________________________________________________________ CVBS 2 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 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 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. +3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC OFF SVIDEO CHROMA LOAD SENSE YIN YOUT 6dB LPF OFF 75Ω OFF OFF BUFFER CURRENT DAC COUT 6dB LPF 75Ω SVIDEO LUMA OFF OFF INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB 75Ω CVBS1 CVBSIN CURRENT DAC 75Ω BUFFER +3.3V VIDEO SIGNAL PRESENT LPF EXTCVBSIN LOAD SENSE CLAMP OFF 0 TO 50mV 6dB CVBSOUT2 75Ω CVBS 2 OFF GND Figure 4. Full-Operation Mode with CVBSOUT1 Loaded ______________________________________________________________________________________ 13 MAX9508 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 MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support +3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC OFF SVIDEO CHROMA LOAD SENSE BUFFER YOUT 6dB LPF OFF 75Ω OFF OFF YIN CURRENT DAC COUT 6dB LPF 75Ω SVIDEO LUMA OFF OFF INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB CVBSIN CURRENT DAC VIDEO SIGNAL PRESENT CVBS 1 OFF BUFFER +3.3V 75Ω LPF EXTCVBSIN LOAD SENSE CLAMP OFF 0 TO 50mV 6dB CVBSOUT2 75Ω 75Ω GND Figure 5. Full-Operation Mode with CVBSOUT2 Loaded 14 CVBS2 ______________________________________________________________________________________ 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 LOAD SENSE BUFFER CIN CURRENT DAC COUT 6dB LPF 75Ω SVIDEO CHROMA 75Ω LOAD SENSE BUFFER YIN CURRENT DAC YOUT 6dB LPF 75Ω SVIDEO LUMA 75Ω INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB 75Ω CVBS1 CVBSIN CURRENT DAC 75Ω BUFFER +3.3V VIDEO SIGNAL PRESENT LPF EXTCVBSIN LOAD SENSE CLAMP OFF 0 TO 50mV 6dB CVBSOUT2 75Ω CVBS2 75Ω GND Figure 6. Full-Operation Mode with All Outputs Loaded ______________________________________________________________________________________ 15 MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support Internal Mode Versus External Mode source such as a DVD chip (Figure 7). The 2:1 multiplexer selects the video signal on CVBSIN. The EXTCVBSIN video signal is ignored. Internal Mode Set the INT/EXT control input low for internal mode. The MAX9508 processes video signals from an internal +3.3V 0.1μF 13mA QUIESCENT SUPPLY CURRENT VDD 75Ω DVD CHIP TO TFT LCD LOAD SENSE BUFFER CIN CURRENT DAC COUT 6dB LPF 75Ω SVIDEO CHROMA 75Ω TO TFT LCD LOAD SENSE BUFFER YIN CURRENT DAC YOUT 6dB LPF 75Ω SVIDEO LUMA LOGIC LOW INT/EXT SMARTSLEEP MICROCONTROLLER +3.3V MAX9508 CONTROL LOGIC SHDN ACTIVE VIDEO DETECT LOAD SENSE CVBSOUT1 6dB 75Ω CVBS CVBSIN CURRENT DAC BUFFER LPF EXTCVBSIN LOAD SENSE CLAMP OFF 6dB CVBSOUT2 75Ω 0.1μF GND Figure 7. Internal Mode Operation for Portable DVD Applications 16 ______________________________________________________________________________________ TO Y/C SEPARATION CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 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 VDD 75Ω DVD CHIP TO TFT LCD LOAD SENSE BUFFER OFF CIN CURRENT DAC 6dB LPF OFF COUT OFF OFF 75Ω SVIDEO CHROMA 75Ω TO TFT LCD LOAD SENSE BUFFER OFF YIN CURRENT DAC 6dB LPF OFF LOGIC HIGH YOUT 75Ω SVIDEO LUMA OFF OFF INT/EXT MICROCONTROLLER 0V OR SMARTSLEEP +3.3V SHDN +3.3V MAX9508 CONTROL LOGIC ACTIVE VIDEO DETECT LOAD SENSE OFF 6dB CVBSIN CURRENT DAC CVBSOUT1 75Ω CVBS 75Ω VIDEO SOURCE OFF BUFFER LPF EXTCVBSIN LOAD SENSE CLAMP 6dB CVBSOUT2 75Ω TO Y/C SEPARATION 0.1μF GND Figure 8. External Mode Operation for Portable DVD Applications ______________________________________________________________________________________ 17 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- MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support Inputs 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 0.1µF 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. 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 +3.3V 0.1μF VDD VIDEO ENCODER Pr/R CURRENT DAC LOAD SENSE BUFFER CIN 75Ω Pr/R LOAD SENSE BUFFER Pb/B YIN CURRENT DAC COUT 6dB LPF YOUT 6dB LPF 75Ω Pb/B INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN ACTIVE VIDEO DETECT LOAD SENSE CVBSOUT1 6dB Y/G 75Ω Y/G CVBSIN CURRENT DAC BUFFER +3.3V LPF EXTCVBSIN LOAD SENSE CLAMP 6dB CVBSOUT2 75Ω GND Figure 9. Y, Pr, Pb or RGB Set Applied to MAX9508 18 ______________________________________________________________________________________ Y/G CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support 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. 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 28kΩ, due to the internal feedback resistors to ground. 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 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 resistor 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 output 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. 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 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. ______________________________________________________________________________________ 19 MAX9508 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. MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support +3.3V 0.1μF VDD SET-TOP BOX CHIP LOAD SENSE BUFFER CURRENT DAC CIN CURRENT DAC YIN COUT 6dB LPF 75Ω 220μF 75Ω 220μF 75Ω 220μF SVIDEO CHROMA LOAD SENSE BUFFER YOUT 6dB LPF SVIDEO LUMA INT/EXT +3.3V MAX9508 CONTROL LOGIC SMARTSLEEP SHDN LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB CVBS 1 CVBSIN CURRENT DAC BUFFER LPF EXTCVBSIN GND LOAD SENSE CLAMP OFF 6dB CVBSOUT2 75Ω 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 0.1µF capacitor. Place all external components as close to the device as possible. 20 ______________________________________________________________________________________ 220μF CVBS 2 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support LOAD SENSE BUFFER CIN COUT 6dB LPF LOAD SENSE BUFFER YIN YOUT 6dB LPF INT/EXT SMARTSLEEP MAX9508 CONTROL LOGIC SHDN ACTIVE VIDEO DETECT 0 TO 50mV LOAD SENSE 300mV TO 400mV CVBSOUT1 6dB CVBSIN BUFFER LPF EXTCVBSIN LOAD SENSE CLAMP 6dB CVBSOUT2 ______________________________________________________________________________________ 21 MAX9508 Block Diagrams (continued) CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support MAX9508 Pin Configuration Chip Information YOUT CVBSOUT1 CVBSOUT2 TOP VIEW COUT PROCESS: BiCMOS 12 11 10 9 VDD 13 8 GND INT/EXT 14 7 N.C. 6 SHDN 5 EXTCVBSIN MAX9508 SMARTSLEEP 15 2 3 4 CVBSIN VDD 1 GND + YIN CIN 16 THIN QFN (3mm x 3mm) 22 ______________________________________________________________________________________ CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support PACKAGE CODE DOCUMENT NO. 16 TQFN-EP T1633-4 21-0136 (NE - 1) X e E MARKING 12x16L QFN THIN.EPS PACKAGE TYPE E/2 D2/2 (ND - 1) X e D/2 AAAA e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C C L C L 0.08 C A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm 21-0136 I 1 2 ______________________________________________________________________________________ 23 MAX9508 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. MAX9508 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.) PKG 8L 3x3 12L 3x3 16L 3x3 REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. A 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 b 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 D 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 E 2.90 3.00 3.10 2.90 3.00 3.10 2.90 3.00 3.10 0.75 0.45 0.65 0.30 e L 0.65 BSC. 0.35 0.55 0.50 BSC. 0.50 BSC. 0.55 0.40 N 8 12 16 ND 2 3 4 NE 2 3 4 0 A1 A2 k 0.02 0.05 0 0.20 REF 0.25 - 0.02 0.05 0 0.20 REF - 0.25 - EXPOSED PAD VARIATIONS 0.02 0.50 0.05 0.20 REF - 0.25 - PKG. CODES D2 MIN. E2 NOM. MAX. MIN. NOM. MAX. PIN ID JEDEC TQ833-1 0.25 0.70 1.25 0.25 0.70 1.25 0.35 x 45° T1233-1 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEEC WEED-1 T1233-3 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-1 T1233-4 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-1 T1633-2 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 T1633F-3 0.65 0.80 0.95 0.65 0.80 0.95 0.225 x 45° WEED-2 T1633FH-3 0.65 0.80 0.95 0.65 0.80 0.95 0.225 x 45° WEED-2 T1633-4 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 T1633-5 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° WEED-2 - NOTES: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 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. PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm 21-0136 24 ______________________________________________________________________________________ I 2 2 CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support REVISION NUMBER REVISION DATE 2 1/09 DESCRIPTION Removed QSOP package PAGES CHANGED 1, 2, 9, 22 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 © 2009 Maxim Integrated Products Heaney Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX9508 Revision History