19-0535; Rev 2; 2/09 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit The MAX9512 video filter amplifier with SmartSleep and Y/C mixer is ideal for portable media players (PMPs), portable DVD players, and set-top boxes (STBs). The inputs can be directly connected to the digital-to-analog converter (DAC) outputs. The dual reconstruction filters remove high-frequency signals above 6.75MHz. The Y/C-to-CVBS mixer creates a composite video signal from luma and chroma. The four amplifiers each have 6dB of gain. The outputs can be DC-coupled to a load of 75Ω, which is equivalent to two video loads, or 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 MAX9512 does not detect the presence of sync on luma, 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 MAX9512 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 Media Players (PMPs) Features ♦ SmartSleep Feature Detects Input Signal and Output Load Status to Reduce Power Consumption ♦ Dual Standard-Definition Video Reconstruction Filters with 6.75MHz Passband ♦ Luma and Chroma Inputs ♦ Y/C-to-CVBS Mixer ♦ Luma, Chroma, and Two Composite Outputs ♦ Supports Two Video Loads at Each Output (DC-Coupled) ♦ 2.7V to 3.6V Single-Supply Operation Ordering Information PART MAX9512ATE+ PIN-PACKAGE TOP MARK 16 TQFN-EP* (3mm x 3mm) AEN Note: All devices specified over the -40°C to +125°C operating temperature range. +Denotes lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Set-Top Boxes (STBs) Portable Applications Block Diagrams Portable DVD Players LOAD SENSE Pin Configuration BUFFER COUT YOUT CVBSOUT1 CVBSOUT2 CIN 12 11 10 9 TOP VIEW VDD 13 N.C. 14 MAX9512 SMARTSLEEP 15 LOAD SENSE YIN 8 GND 7 N.C. 6 SHDN 5 + COUT 6dB BUFFER SMARTSLEEP SHDN CIN 16 LPF N.C. LPF LOAD SENSE ACTIVE VIDEO DETECT CONTROL LOGIC YOUT 6dB CVBSOUT1 6dB 2 3 4 VDD YIN GND N.C. LOAD SENSE 1 THIN QFN (3mm x 3mm) MAX9512 6dB 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 MAX9512 General Description MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND) VDD ...........................................................................-0.3V to +4V CIN, YIN, SMARTSLEEP, SHDN...............................-0.3V to +4V Duration of COUT, YOUT, CVBSOUT1, CVBSOUT2 Short Circuit to VDD or GND....................................Continuous Continuous Input Current CIN, YIN, SMARTSLEEP, SHDN ....................................±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN-EP (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 = GND = 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 TYP 2.7 MAX UNITS 3.6 V mA YIN = 0.3V, CIN = 0.6V 13 16 SMARTSLEEP = VDD, YIN has no active video signal 7 14 µA SMARTSLEEP = VDD, YIN has a black-burst video signal with sync tip at GND (Note 2) Shutdown Supply Current ISHDN 17 VSHDN = GND 0.01 10 µA 5.2 % VDD 200 Ω SMARTSLEEP CHARACTERISTICS Minimum Line Frequency YIN 14.3 Sync Slice Level YIN 4.1 Output Load Detect Threshold RL to GND, sync pulse present kHz DC CHARACTERISTICS Input-Voltage Range VIN CIN, YIN, 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 = 0V 2 Input Resistance RIN CIN, YIN 20 DC Voltage Gain 2 AV RL = 150Ω to VDD / 2 TA = -40°C to 0V ≤ VIN ≤ +85°C 1.05V, VDD TA = -40°C to = 2.7V +125°C 0V ≤ VIN ≤ 1.2V, VDD = 3.0V 5.7 6 5.6 5 µA MΩ 6.3 6.3 dB TA = -40°C to +85°C 5.7 TA = -40°C to +125°C 5.6 6 _______________________________________________________________________________________ 6.3 6.3 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit (VDD = VSHDN = 3.3V, VSMARTSLEEP = GND = 0V. RL = No load. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 0V ≤ VIN ≤ 1.05V, VDD = 2.7V -0.2 0 +0.2 0V ≤ VIN ≤ 1.2V, VDD = 3.0V -0.2 0 +0.2 0.188 0.3 0.400 TA = -40°C to +85°C 2.027 2.1 2.163 TA = -40°C to +125°C 2.006 DC Gain Matching UNITS dB Output Level CIN = YIN = 0V, RL = 150Ω to GND Measured at output, VDD = 2.7V, 0V ≤ VIN ≤ 1.05V, RL = 150Ω to -0.2V Measured at output, VDD = 2.7V, 0V ≤ VIN ≤ 1.05V, RL = 150Ω to VDD / 2 Output Voltage Swing Measured at output, VDD = 3V, 0V ≤ VIN ≤ 1.2V, RL = 150Ω to -0.2V 2.163 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 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 ROUT VOUT = 1.3V, -5mA ≤ ILOAD ≤ +5mA Power-Supply Rejection Ratio PSRR 2.7V ≤ VDD ≤ 3.6V, input referred, RL = 150Ω to GND Ω 0.47 48 Output Shutdown Impedance VP-P 2.472 Measured at output, VDD = 3V, 0V ≤ VIN ≤ 1.2V, RL = 150Ω to VDD / 2 Output Resistance V dB 28 kΩ LOGIC INPUTS (SMARTSLEEP, SHDN) Logic-Low Threshold Logic-High Threshold Logic Input Current VIL 0.3 x VDD VIH IIL/IIH 0.7 x VDD VI = 0V or VDD V V 0.01 10 µA _______________________________________________________________________________________ 3 MAX9512 ELECTRICAL CHARACTERISTICS (continued) MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit AC CHARACTERISTICS (VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 0V, RL = 150Ω to GND. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Color Subcarrier Output Voltage Swing CONDITIONS MIN VDD = 2.7V, YIN = 0.65V, CIN = 0.7VP-P 1.4 VDD = 3.0V, YIN = 0.75V, CIN = 0.9VP-P 1.8 300 f = 5.5MHz Inputs are 1VP-P, Reference frequency is 1MHz Standard-Definition Reconstruction Filter f = 6.75MHz -0.3 kHz +1 dB -3 -33 -41 f = 3.58MHz or 4.43MHz AC-coupled output, 5-step modulated staircase f = 3.58MHz or 4.43MHz 0.4 f = 3.58MHz 0.62 f = 4.43MHz 0.75 f = 3.58MHz 0.78 f = 4.43MHz 1.01 0.2 DG % DP degrees AC-coupled output, 5-step modulated staircase 4 -1 DC-coupled output, 5-step modulated staircase DC-coupled output, 5-step modulated staircase 2T Pulse Response UNITS -0.1 f = 11MHz f = 27MHz Differential Phase MAX VP-P Mixer HPF -3dB Frequency Differential Gain TYP 2T = 200ns or 250ns 0.2 _______________________________________________________________________________________ K% Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit (VDD = VSHDN = +3.3V, VSMARTSLEEP = GND = 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 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% 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 Outputs are 2VP-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 -71 dB All Hostile Input Crosstalk f = 4.43MHz, SHDN = GND, input termination resistors are 75Ω -106 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 MAX9512 AC CHARACTERISTICS (continued) Typical Operating Characteristics (VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY -10 -20 -30 -40 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -50 -1.0 100k 1M 10M -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 MAX9512 toc06 VOUT = 2VP-P NORMALIZED TO 1MHz MAX9512 toc05 150 MAX9512 toc04 1.0 75 50 -30 -40 -50 -0.4 25 -60 -0.6 -0.8 -1.0 100k 1M -70 -25 -80 1M 100k 100M 10M 0 10M 100M 10k 13.0 12.5 12.0 11.5 MAX9512 toc08 2.02 2.01 VOLTAGE GAIN (V/V) 13.5 10M VOLTAGE GAIN vs. TEMPERATURE MAX9512 toc07 14.0 1M FREQUENCY (Hz) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT (mA) 100k FREQUENCY (Hz) FREQUENCY (Hz) 2.00 1.99 1.98 1.97 1.96 1.95 11.0 -50 -25 0 25 50 75 TEMPERATURE (°C) 6 -10 -60 1M 100k 100M 0 -50 -0.8 -60 VOUT = 2VP-P NORMALIZED TO 1MHz 10 OUTPUT AMPLITUDE (dB) 0 0.8 VOUT = 100mVP-P NORMALIZED TO 1MHz 0.8 20 MAX9512 toc02 VOUT = 100mVP-P NORMALIZED TO 1MHz OUTPUT AMPLITUDE (dB) OUTPUT AMPLITUDE (dB) 10 1.0 MAX9512 toc01 20 LARGE-SIGNAL GAIN vs. FREQUENCY MAX9512 toc03 SMALL-SIGNAL GAIN vs. FREQUENCY OUTPUT AMPLITUDE (dB) MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit 100 125 -50 -25 0 25 50 75 100 TEMPERATURE (°C) _______________________________________________________________________________________ 125 100M Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.5 2.0 1.5 DIFFERENTIAL PHASE (DEG) OUTPUT VOLTAGE (V) 3.0 1.0 0.5 0 MAX9512 toc11 MAX9512 toc10 YIN, CIN INPUTS ONLY 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 DIFFERENTIAL GAIN (%) 3.5 2T RESPONSE DIFFERENTIAL GAIN AND PHASE MAX9512 toc09 4.0 VIN 200mV/div 1 2 3 4 5 6 7 0.8 0.4 VOUT 400mV/div 0 -0.4 -0.5 -0.8 -0.5 0 0.5 1.0 1.5 2.0 INPUT VOLTAGE (V) 4 STEP 12.5T RESPONSE NTC-7 VIDEO TEST SIGNAL GENERATED FROM LUMA AND CHROMA INPUTS 1 2 3 5 6 100ns/div 7 PAL MULTIBURST RESPONSE MAX9512 toc13 MAX9512 toc12 MAX9512 toc14 YIN 500mV/div YIN 200mV/div CVBSIN 500mV/div CIN 500mV/div CVBSOUT1 1V/div CVBOUT1 1V/div YOUT 400mV/div 10μs/div 400ns/div 10μs/div FIELD SQUARE-WAVE RESPONSE PAL COLOR BARS MAX9512 toc16 MAX9512 toc15 CVBSIN 500mV/div CVBSIN 500mV/div CVBSOUT1 1V/div 10μs/div CVBSOUT1 1V/div 2ms/div _______________________________________________________________________________________ 7 MAX9512 Typical Operating Characteristics (continued) (VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = V SHDN = +3.3V, VSMARTSLEEP = GND = 0V. Video outputs have RL = 150Ω connected to GND. TA = +25°C, unless otherwise noted.) ENABLE TIME FREQUENCY RESPONSE AT 6.75MHz DISTRIBUTION DISABLE TIME MAX9512 toc17 MAX9512 toc19 MAX9512 toc18 INPUT VOLTAGE = 1V INPUT VOLTAGE = 1V OUTPUT 1V/div SHDN 1V/div SHDN 1V/div PROBABILITY OUTPUT 1V/div 2μs/div -0.6 200ns/div -0.5 -0.4 -0.3 -0.2 ATTENUATION (dB) INPUT-TO-INPUT CROSSTALK vs. FREQUENCY FREQUENCY RESPONSE AT 27MHz DISTRIBUTION -20 CROSSTALK (dB) PROBABILITY MAX9512 toc21 MAX9512 toc20 0 -40 -60 -80 -100 -120 -52 -50 -48 -46 -44 -42 -40 -38 -36 -34 -32 100k 1M 10M ATTENUATION (dB) FREQUENCY (Hz) OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY OUTPUT IMPEDANCE vs. FREQUENCY OUTPUT IMPEDANCE (Ω) -20 -40 -60 -80 100M MAX9512 toc23 100 MAX9512 toc22 0 CROSSTALK (dB) MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit 10 1 -100 -120 0.1 100k 1M 10M FREQUENCY (Hz) 8 100M 100k 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 100M -0.1 0 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit PIN NAME TQFN-EP 1, 13 VDD FUNCTION Power Supply. Bypass with a 0.1µF capacitor to GND. 2 YIN 3, 8 GND Ground Luma Video Input. Directly connect this input to the video DAC output. 4, 5, 7, 14 N.C. No Connection. Connect to GND. 6 SHDN 9 CVBSOUT2 CVBS Output 2 10 CVBSOUT1 CVBS Output 1 11 YOUT Luma Video Output 12 COUT Chroma Video Output 15 SMARTSLEEP 16 CIN Chroma Video Input. Directly connect this input to the video DAC output. — EP Exposed Pad. Connect EP to GND. EP is also internally connected to GND. Active-Low Shutdown Logic Input. Connect to logic low to place device in shutdown. Connect to logic high for normal operation. SmartSleep Logic Input. Connect to logic high to activate SmartSleep operation. +3.3V 0.1μF VDD VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC 75Ω CHROMA LOAD SENSE BUFFER YIN CURRENT DAC COUT 6dB LPF YOUT 6dB LPF LUMA LOAD SENSE MAX9512 ACTIVE VIDEO DETECT 75Ω CVBSOUT1 6dB 75Ω CVBS1 SMARTSLEEP +3.3V SHDN CONTROL LOGIC LOAD SENSE 6dB CVBSOUT2 75Ω CVBS2 GND Figure 1. Typical Application Circuit for Portable Media Players _______________________________________________________________________________________ 9 MAX9512 Pin Description MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit Detailed Description loads attached to the 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 YIN input and whether there are loads connected at the outputs. SmartSleep only works with DC-coupled loads. In the Typical Application Circuit (Figure 1), the current DACs on a video encoder generate luma and chroma video signals. The MAX9512 filters those signals and then adds them together to create the composite video signal. The output amplifiers drive the video connectors through a 75Ω back termination resistor. 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 YIN signal. If no sync is detected the device remains in standby mode. 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 a luma video signal or +3.3V 7μA NO VIDEO SIGNAL VDD VIDEO ENCODER LOAD SENSE BUFFER OFF CIN CURRENT DAC 6dB LPF OFF COUT 75Ω CHROMA OFF OFF OFF LOAD SENSE BUFFER OFF YIN CURRENT DAC 6dB LPF OFF YOUT 75Ω LUMA OFF OFF LOAD SENSE OFF 6dB ACTIVE VIDEO DETECT CVBSOUT1 75Ω CVBS1 OFF SMARTSLEEP +3.3V SHDN CONTROL LOGIC LOAD SENSE OFF 6dB CVBSOUT2 75Ω OFF MAX9512 GND Figure 2. Standby Mode Operation 10 ______________________________________________________________________________________ CVBS2 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit based on the input signal presence and output loading. Figures 4 and 5 show which portions of the MAX9512 turn on and which remain off with different load configurations. In Figure 4, both filters and the Y/C mixer turn on to generate the composite video signal for the amplifier connected to CVBSOUT1. In Figure 5, only the luma filter turns on, and the Y/C mixer stays off. 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 disconnected and the amplifier returns to active-detect mode. If, at any time, the input video signal is removed, the MAX9512 returns to standby mode. If the SmartSleep feature is not activated and the part is not in shutdown, then 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. 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 +3.3V 0 TO 50mV 17μA VDD VIDEO SIGNAL PRESENT VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC LPF OFF OFF YOUT 6dB LPF OFF CHROMA LOAD SENSE YIN CURRENT DAC 75Ω OFF OFF BUFFER COUT 6dB 75Ω LUMA NO LOADS OFF OFF LOAD SENSE ACTIVE VIDEO DETECT SMARTSLEEP +3.3V CVBSOUT1 6dB 75Ω CVBS1 OFF CONTROL LOGIC SHDN LOAD SENSE 6dB CVBSOUT2 75Ω CVBS2 OFF MAX9512 GND Figure 3. Active-Detect Mode with No Output Loads ______________________________________________________________________________________ 11 MAX9512 Active-Detect Mode The active video detect circuit slices the YIN 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, then a video signal is present. When the MAX9512 detects a video signal with sync at the YIN 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 MAX9512 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. MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit 0 TO 50mV +3.3V 5mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO SIGNAL PRESENT VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC COUT 6dB LPF 75Ω CHROMA OFF LOAD SENSE BUFFER YIN CURRENT DAC YOUT 6dB LPF 75Ω LUMA OFF LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB 75Ω CVBS1 SMARTSLEEP +3.3V SHDN CONTROL LOGIC 75Ω LOAD SENSE 6dB CVBSOUT2 75Ω MAX9512 OFF GND Figure 4. Full Operation Mode with CVBSOUT1 Loaded 12 ______________________________________________________________________________________ CVBS 2 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512 0 TO 50mV +3.3V 2.9mA QUIESCENT SUPPLY CURRENT PLUS OUTPUT LOAD CURRENT VDD VIDEO SIGNAL PRESENT VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC LPF OFF 75Ω CHROMA OFF OFF OFF LOAD SENSE BUFFER YIN CURRENT DAC COUT 6dB YOUT 6dB LPF 75Ω LUMA 75Ω LOAD SENSE ACTIVE VIDEO DETECT CVBSOUT1 6dB 75Ω CVBS1 SMARTSLEEP +3.3V OFF CONTROL LOGIC SHDN LOAD SENSE 6dB CVBSOUT2 75Ω CVBS2 MAX9512 OFF GND Figure 5. Full Operation Mode with YOUT Loaded ______________________________________________________________________________________ 13 MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit Inputs The MAX9512 video inputs YIN and CIN 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 the luma signal is within 50mV of ground and the blank level of the chroma signal is between 0.5V and 0.65V. Video Reconstruction Filter The MAX9512 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 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player are not channel limited; therefore, the bandwidth of DVD video signals can push right against the Nyquist limit of 6.75MHz. (Recommendation ITU-R BT.601-5 specifies 13.5MHz as the sampling rate for standard-definition video). Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz. Y/C Mixer The Y/C mixer adds the luma and chroma signals together to create a composite video signal. Since chroma is a phase modulated carrier at 3.58MHz for NTSC and 4.43MHz for PAL, the chroma signal is ACcoupled into the Y/C mixer so that the variation in blank level from one video source to another video source does not affect the DC bias of the composite video signal. The highpass corner frequency of the chroma ACcoupling circuit is 300kHz. 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 MAX9512 has an internal level shift circuit that positions the sync tip at approximately 300mV at the output. The 14 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 MAX9512 draws less than 1µA 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 and CIN 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 MAX9512 as close to the video DAC outputs as possible. ______________________________________________________________________________________ Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit Power-Supply Bypassing and Ground The MAX9512 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. +3.3V 0.1μF VDD VIDEO ENCODER LOAD SENSE BUFFER CIN CURRENT DAC LPF 75Ω YIN YOUT 6dB LPF CHROMA 75Ω ACTIVE VIDEO DETECT +3.3V 220μF LUMA LOAD SENSE 0V 220μF LOAD SENSE BUFFER CURRENT DAC COUT 6dB CVBSOUT1 6dB 75Ω 220μF CVBS1 SMARTSLEEP SHDN CONTROL LOGIC LOAD SENSE 6dB CVBSOUT2 75Ω 220μF CVBS2 MAX9512 GND Figure 6. AC-Coupling at the Outputs ______________________________________________________________________________________ 15 MAX9512 AC-Coupling the Outputs The outputs can be AC-coupled since the output stage can source and sink current as shown in Figure 6. 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. Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit MAX9512 Block Diagrams (continued) LOAD SENSE BUFFER CIN LPF 0 TO 50mV COUT 6dB LOAD SENSE BUFFER YIN LPF YOUT 6dB ACTIVE VIDEO DETECT 300mV TO 400mV LOAD SENSE SMARTSLEEP SHDN CONTROL LOGIC CVBSOUT1 6dB LOAD SENSE MAX9512 6dB CVBSOUT2 Chip Information PROCESS: BiCMOS 16 ______________________________________________________________________________________ Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit 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 ______________________________________________________________________________________ 17 MAX9512 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. MAX9512 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit 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 e L 0.65 BSC. 0.35 0.55 0.50 BSC. 0.75 0.45 0.55 0.50 BSC. 0.65 0.30 0.40 N 8 12 16 ND 2 3 4 NE 2 3 4 0 A1 A2 k 0.02 0.05 0 0.25 - 0.02 0.05 0 - 0.25 - 0.02 0.50 0.05 0.20 REF 0.20 REF 0.20 REF EXPOSED PAD VARIATIONS - 0.25 - PKG. CODES TQ833-1 E2 D2 PIN ID JEDEC MIN. NOM. MAX. MIN. NOM. MAX. 0.25 0.70 1.25 0.25 0.70 1.25 0.35 x 45° WEEC WEED-1 T1233-1 0.95 1.10 1.25 0.95 1.10 1.25 0.35 x 45° 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 18 ______________________________________________________________________________________ I 2 2 Video Filter Amplifier with SmartSleep and Y/C Mixer Circuit REVISION NUMBER REVISION DATE 1 5/1/06 2 2/09 DESCRIPTION Initial release Removed QSOP package PAGES CHANGED — 1, 2, 3, 16, 17, 18 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 ____________________ 19 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX9512 Revision History