19-4453; Rev 0; 2/09 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps The MAX9657 is a small, low-power, quad video amplifier with input sync-tip clamps. It features a bandwidth of 15MHz, making it suitable for not only standard-definition video signals, but also video graphics array (VGA) signals with a 640 x 480 resolution at up to 85Hz refresh rate. The MAX9658 is a quad video amplifier with integrated lowpass filters and input sync-tip clamps. The lowpass filters typically have ±1dB passband flatness out to 9.5MHz and 47dB attenuation at 27MHz. Specially suited for composite video signals, the MAX9658 is ideal for performing anti-alias filtering at the inputs of a digital video recorder or for performing reconstruction filtering at the outputs of a SCART set-top box. Both devices require that the incoming video signals be AC-coupled to the inputs. The input sync-tip clamps set the internal DC level of the video signals. The amplifiers have 2V/V gain, and the outputs can be DC-coupled to a 75Ω load, which is the equivalent of two video loads, or AC-coupled to a 150Ω load. Both the MAX9657/MAX9658 feature a low-power shutdown mode, in which supply current is reduced to 35µA. The MAX9657/MAX9658 operate from a single 2.7V to 3.6V supply, are specified over the -40°C to +125°C automotive temperature range, and are offered in a small, 16-pin QSOP package. Applications Features ♦ Quad Channel ♦ 9.5MHz, ±1dB Passband (MAX9658) ♦ 47dB Attenuation at 27MHz (MAX9658) ♦ Fixed Gain of 2V/V ♦ Low Power: 21mA ♦ 2.7V to 3.6V Single-Supply Operation Ordering Information PART PIN-PACKAGE STANDARD-DEFINITION VIDEO FILTER MAX9657AEE+ 16 QSOP No MAX9658AEE+ 16 QSOP Yes Note: All devices are specified over the -40°C to +125°C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. Functional Diagram MAX9657/MAX9658 UNKNOWN BIAS SHDN 300mV IN0 OUT0 LPF* Set-Top Boxes AV = 2V/V Digital Video Recorders CLAMPREF IN1 OUT1 LPF* AV = 2V/V CLAMPREF IN2 OUT2 LPF* AV = 2V/V Typical Application Circuits and Pin Configuration appear at end of data sheet. CLAMPREF IN3 OUT3 LPF* AV = 2V/V CLAMPREF GND *LOWPASS FILTER IN MAX9658 ONLY. ________________________________________________________________ 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 MAX9657/MAX9658 General Description MAX9657/MAX9658 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps ABSOLUTE MAXIMUM RATINGS Supply Voltage VDD to GND ..........................................................-0.3V to +4V Input Pins, SHDN .....................................(GND - 0.3V) to +4V Duration of Output Short Circuit to VDD or GND ........Continuous Continuous Input Current Input Pins......................................................................±20mA Continuous Power Dissipation (TA = +70°C) 16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = 3.3V, VGND = 0V, V SHDN = VDD, 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 2.7 UNITS Supply Voltage Range VDD Guaranteed by power-supply rejection test 3.3 3.6 V Quiescent Supply Current IDD No load 21 45 mA Shutdown Supply Current ISHDN SHDN = GND 35 70 µA Sync-Tip Clamp Level VCLP 0.3 0.39 V 0.23 Guaranteed by outputvoltage swing Input Voltage Range 2.7V ≤ VDD ≤ 3.6V 1.05 3.0V ≤ VDD ≤ 3.6V 1.2 VP-P Sync-tip clamp; percentage reduction in sync pulse (0.3VP-P); guaranteed by input clamping current measurement Sync Crush Input Clamping Current 1 Maximum Input Source Resistance 300 DC Voltage Gain (Note 2) AV RL = 150Ω to GND (Note 2) VDD = 2.7V, 0V ≤ VIN ≤ 1.05V 1.96 VDD = 3V, 0V ≤ VIN ≤ 1.2V 1.96 DC Gain Mismatch Guaranteed by DC voltage gain Output Level Measured at VOUT, CIN_ = 0.1µF to GND Output-Voltage Swing 2 2 2 % 2 µA Ω 2.04 V/V 2 2.04 +2 % 0.3 0.39 V -2 0.218 Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150Ω to -0.2V 2.1 Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150Ω to VDD/2 2.1 Measured at output, VDD = 3.0V, VIN = VCLP to (VCLP +1.2V), RL = 150Ω to -0.2V 2.4 Measured at output, VDD = 3.0V, VIN = VCLP to (VCLP +1.2V), RL = 150Ω to VDD/2 2.4 Measured at output, VDD = 3.135V, VIN = VCLP to (VCLP +1.05V), RL = 75Ω to -0.2V 2.1 _______________________________________________________________________________________ VP-P Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps (VDD = 3.3V, VGND = 0V, V SHDN = VDD, RL = 150Ω to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Output Short-Circuit Current Output Resistance ROUT CONDITIONS TYP 140 Short to VDD (sinking) 70 VOUT = 1.5V, -10mA ≤ ILOAD ≤ +10mA 2.7V ≤ VDD ≤ 3.6V Power-Supply Rejection Ratio MIN Short to GND (sourcing) 0.2 48 f = 100kHz, 100mVP-P 64 20 MAX UNITS mA Ω dB Small-Signal Bandwidth VOUT = 100mVP-P (MAX9657 only) 27 MHz Large-Signal Bandwidth VOUT = 2VP-P (MAX9657 only) 15 MHz Slew Rate MAX9657 only 65 V/µs Settling Time Settled to within 0.1% of final value (MAX9657 only) 75 ns VOUT = 2VP-P, reference frequency is 100kHz ±1dB passband flatness (MAX9658 only) 9.5 MHz Standard-Definition Reconstruction Filter VOUT = 2VP-P, reference frequency is 100kHz (MAX9658 only) f = 5.5MHz 0.1 f = 9.5MHz -1 f = 10MHz -3 f = 27MHz -47 dB Differential Gain DG 5-step modulated staircase of 129mV step size and 286mV peak-to-peak subcarrier amplitude, f = 4.43MHz 0.4 % Differential Phase DP 5-step modulated staircase of 129mV step size and 286mV peak-to-peak subcarrier amplitude, f = 4.43MHz 0.45 deg Group-Delay Distortion 100kHz ≤ f ≤ 5MHz, outputs are 2VP-P 9 ns Peak Signal to RMS Noise 100kHz ≤ f ≤ 5MHz 71 dB 2T Pulse Response 2T = 200ns 0.2 K% 2T Bar Response 2T = 200ns; bar time is 18µs; the beginning 2.5%, and the ending 2.5% of the bar time is ignored 0.2 K% 2T Pulse-to-Bar K Rating 2T = 200ns; bar time is 18µs; the beginning 2.5%, and the ending 2.5% of the bar time is ignored 0.3 K% Nonlinearity 5-step staircase 0.1 % Output Impedance f = 5.5MHz 8.07 Ω All-Hostile Crosstalk Output-to-Input Crosstalk f = 15kHz -82 f = 4.43MHz -78 f = 30MHz -68 dB dB _______________________________________________________________________________________ 3 MAX9657/MAX9658 ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (VDD = 3.3V, VGND = 0V, V SHDN = VDD, 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 0.3 x VDD V LOGIC SIGNALS (SHDN) Logic-Low Threshold VIL Logic-High Threshold VIH Logic Input Current IIN 0.7 x VDD V 10 µA Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Note 2: Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing. Typical Operating Characteristics (MAX9657) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB 2 1 0 -1 GAIN (dB) -2 -3 -4 -5 -6 10M 1M 10M 1M 10M FREQUENCY (Hz) LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY VIDEO CROSSTALK vs. FREQUENCY VIDEO GROUP DELAY DISTORTION vs. FREQUENCY 0 -20 0 -40 GAIN (dB) -1 -2 -3 -60 ALL-HOSTILE -80 -4 -5 -100 2 ADJACENT CHANNELS 10M FREQUENCY (Hz) 100M VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB 45 40 35 30 25 20 10 5 0 -120 1M 100M 15 1 ADJACENT CHANNEL -6 -7 50 GROUP DELAY (ns) VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB MAX9657 toc05 1 100k 100k 100M FREQUENCY (Hz) VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB 2 100k 100M FREQUENCY (Hz) MAX9657 toc04 3 1M -15 -20 -25 -30 -35 -40 -45 -50 -7 100k VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB MAX9657 toc06 -10 -15 -20 -25 -30 -35 -40 -45 -50 4 10 5 0 -5 -10 MAX9657 toc03 3 MAX9657 toc01 VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB GAIN (dB) GAIN (dB) 10 5 0 -5 LARGE-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY MAX9657 toc02 SMALL-SIGNAL GAIN vs. FREQUENCY GAIN (dB) MAX9657/MAX9658 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps 100k 1M 10M FREQUENCY (Hz) 100M 100k 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 100M Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps VOLTAGE GAIN vs. TEMPERATURE -30 -40 -50 2.02 2.01 1.99 1.98 -70 1.97 1.96 100k 1M 10M 100M 3 -25 0 25 50 75 100 125 1 2 3 4 MAX9657 toc09 5 f = 3.58MHz 0 1 2 3 4 5 4 12.5T RESPONSE MAX9657 toc11 MAX9657 toc12 IN 200mV/div IN 200mV/div OUT 400mV/div OUT 400mV/div 5 f = 4.43MHz 2 3 4 NTC-7 VIDEO TEST SIGNAL FIELD SQUARE WAVE MAX9657 toc13 IN 500mV/div PULSE RESPONSE MAX9657 toc14 IN 500mV/div OUT 1V/div 10μs/div 400ns/div 100ns/div 5 OUT 1V/div 2ms/div MAX9657 toc15 1 INPUT (700mV/div) 0 OUTPUT (700mV/div) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 2 -50 2T RESPONSE f = 4.43MHz 1 0 MAX9657 toc10 DIFFERENTIAL GAIN (%) DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN AND PHASE 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 f = 3.58MHz TEMPERATURE (°C) FREQUENCY (Hz) 0.10 0.05 0 -0.05 -0.10 -0.15 -0.25 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 2.00 -60 -80 DIFFERENTIAL GAIN (%) 2.03 VOLTAGE GAIN (V/V) PSRR (dB) -20 MAX9657 toc08 VDD = 3.3V + 100mVP-P -10 DIFFERENTIAL GAIN AND PHASE 2.04 MAX9657 toc07 0 DIFFERENTIAL PHASE (deg) VIDEO PSRR vs. FREQUENCY TIME (100ns/div) _______________________________________________________________________________________ 5 MAX9657/MAX9658 Typical Operating Characteristics (MAX9657) (continued) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) Typical Operating Characteristics (MAX9657) (continued) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) 0.34 0.33 0.32 0.31 0.30 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.29 0.28 0.90 -50 -25 0 25 50 75 100 125 500 MAX9657 toc18 0.35 1.06 SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE MAX9657 toc17 0.36 SYNC-TIP CLAMP CURRENT (μA) MAX9657 toc16 0.37 VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE SYNC-TIP CLAMP CURRENT (μA) VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE SYNC-TIP CLAMP VOLTAGE (V) 400 300 200 100 0 -100 -50 -25 TEMPERATURE (°C) 0 25 50 75 100 125 TEMPERATURE (°C) 0 0.2 0.4 0.6 MAX9657 toc19 22.0 21.5 21.0 20.5 20.0 19.5 19.0 18.5 18.0 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) 6 0.8 1.0 INPUT VOLTAGE (V) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE QUIESCENT SUPPLY CURRENT (mA) MAX9657/MAX9658 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps _______________________________________________________________________________________ 1.2 1.4 1.6 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps 1 GAIN (dB) -1 -2 -3 -4 -5 -6 1M 10M VIDEO CROSSTALK vs. FREQUENCY VIDEO GROUP DELAY DISTORTION vs. FREQUENCY VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB -40 GAIN (dB) -2 -3 -60 ALL-HOSTILE -80 -4 -5 -100 1 ADJACENT CHANNEL -6 -120 100M 100k 1M FREQUENCY (Hz) VIDEO PSRR vs. FREQUENCY VOLTAGE GAIN vs. TEMPERATURE -30 -40 -50 MAX9657 toc27 2.03 VOLTAGE GAIN (V/V) -20 2.02 2.01 1.99 1.98 -70 1.97 1.96 1M 10M FREQUENCY (Hz) 100M 100M 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0.8 0.6 0.4 0.2 0 -0.2 -0.4 f = 3.58MHz 0 1 2 3 4 5 2.00 -60 -80 10M DIFFERENTIAL GAIN AND PHASE 2.04 MAX9657 toc26 VDD = 3.3V + 100mVP-P 1M FREQUENCY (Hz) FREQUENCY (Hz) -10 100k 100M 10M 40 30 DIFFERENTIAL GAIN (%) 10M 50 DIFFERENTIAL PHASE (deg) 1M 80 70 60 20 10 0 2 ADJACENT CHANNELS -7 VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB 110 100 90 GROUP DELAY (ns) -20 120 MAX9657 toc24 0 0 100k 100M 10M LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY -1 100k 1M FREQUENCY (Hz) 1 PSRR (dB) 100k 100M FREQUENCY (Hz) VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB 2 100k MAX9657 toc25 100M MAX9657 toc28 10M -10 -15 -20 -25 -30 -35 -40 FREQUENCY (Hz) MAX9657 toc23 3 1M VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB -45 -50 -7 100k 0 10 5 0 -5 0 -45 -50 GAIN (dB) VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB 2 MAX9657 toc22 3 MAX9657 toc21 VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB MAX9657 toc20 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 LARGE-SIGNAL GAIN vs. FREQUENCY SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY GAIN (dB) GAIN (dB) SMALL-SIGNAL GAIN vs. FREQUENCY -50 -25 0 25 50 75 100 125 f = 3.58MHz 0 1 2 3 4 5 TEMPERATURE (°C) _______________________________________________________________________________________ 7 MAX9657/MAX9658 Typical Operating Characteristics (MAX9658) (continued) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) Typical Operating Characteristics (MAX9658) (continued) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 2T RESPONSE f = 4.43MHz MAX9657 toc30 MAX9657 toc29 DIFFERENTIAL GAIN (%) DIFFERENTIAL GAIN AND PHASE 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 DIFFERENTIAL PHASE (deg) IN 200mV/div 0 1 2 3 4 5 f = 4.43MHz OUT 400mV/div 0 1 2 3 4 12.5T RESPONSE 100ns/div 5 NTC-7 VIDEO TEST SIGNAL MAX9657 toc31 MAX9657 toc32 IN 200mV/div IN 500mV/div OUT 1V/div OUT 400mV/div 400ns/div 10μs/div FIELD SQUARE WAVE VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE MAX9657 toc33 MAX9657 toc34 0.37 0.36 IN 500mV/div OUT 1V/div SYNC-TIP CLAMP VOLTAGE (V) MAX9657/MAX9658 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps 0.35 0.34 0.33 0.32 0.31 0.30 0.29 0.28 2ms/div -50 -25 0 25 50 75 100 TEMPERATURE (°C) 8 _______________________________________________________________________________________ 125 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps 1.00 0.98 0.96 0.94 0.92 300 200 100 0 -50 -25 0 25 50 75 100 125 21.5 21.0 20.5 20.0 19.5 19.0 18.5 18.0 -100 0.90 MAX9657 toc37 400 22.0 QUIESCENT SUPPLY CURRENT (mA) 1.02 MAX9657 toc36 1.04 500 SYNC-TIP CLAMP CURRENT (μA) MAX9657 toc35 SYNC-TIP CLAMP CURRENT (μA) 1.06 QUIESCENT SUPPLY CURRENT vs. TEMPERATURE SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) INPUT VOLTAGE (V) TEMPERATURE (°C) Pin Description PIN NAME 1 IN0 Video Input Channel 0 FUNCTION 2 IN1 Video Input Channel 1 3 IN2 Video Input Channel 2 4 IN3 Video Input Channel 3 5–8, 15 N.C. No Connection. Not internally connected. 9 GND Ground 10 SHDN Active-Low Shutdown Logic Input. Connect to GND to place device in shutdown. Connect to VDD for normal operation. 11 OUT3 Video Output Channel 3 12 OUT2 Video Output Channel 2 13 OUT1 Video Output Channel 1 14 OUT0 16 VDD Video Output Channel 0 Positive Power Supply. Bypass to GND with a 0.1µF capacitor. _______________________________________________________________________________________ 9 MAX9657/MAX9658 Typical Operating Characteristics (MAX9658) (continued) (VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150Ω to GND, TA = +25°C.) MAX9657/MAX9658 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps Detailed Description The MAX9657 consists of input sync-tip clamps and gain of 2V/V output amplifiers capable of driving standard 150Ω loads to ground. It can be used to buffer video signals, for example, before a crosspoint matrix. The MAX9658 filters and amplifies video signals. It is very similar to the MAX9657 except that it also has integrated lowpass filters. This device can be used to provide the anti-alias filtering before the video decoders of a digital video recorder, or it can be used to do the reconstruction filtering after a video DAC that references output signals to the positive supply. Input The MAX9657/MAX9658 feature sync-tip clamps at the input that accept video signals with sync pulses. Composite video with blanking and sync (CVBS) is an example of a video signal with sync pulses. The synctip voltage is internally set to 300mV. In shutdown mode, the inputs to the MAX9657/ MAX9658 do not distort the video signal in case the video source is driving video signals to another video circuit such as a video multiplexer. The inputs in shutdown mode are biased at VDD/3, which is sufficiently above ground such that the ESD diodes never forward bias as the video signal changes. The input resistance is 220kΩ, which presents negligible loading on the video current DAC. Video Filter (MAX9658 Only) The MAX9658 filters feature ±1dB passband out to 9.5MHz and 47dB attenuation at 27MHz, making the filter suitable for standard-definition video signals from all sources (e.g., broadcast and DVD). Broadcast video signals are channel limited: NTSC signals have 4.2MHz bandwidth and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not channel limited, so the bandwidth of DVD video signals can approach 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. 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 The devices draw approximately 35µA of supply current when SHDN is low. In shutdown mode, the amplifier outputs become high impedance. Applications Information AC-Coupling the Outputs The outputs can be AC-coupled since the output stage can source and sink current as shown in Figure 1. 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, the frame rate of NTSC systems is 30Hz, and the frame rate of VGA is usually 60Hz or higher. The corner frequency should be well below the frame rate. Power Consumption The quiescent power consumption and average power consumption of the MAX9657/MAX9658 are very low because of the 3.3V operation and low-power circuit design. Quiescent power consumption is defined when the MAX9657/MAX9658 are operating without loads and without any video signals. Average power consumption represents the normal power consumption when the devices drive real video signals into real video loads. It is measured when the MAX9657/MAX9658 drive a 150Ω load to ground with a 50% flat field, which serves as a proxy for a real video signal. Table 1 shows the quiescent and average power consumption of the MAX9657/MAX9658. Power-Supply Bypassing and Ground The MAX9657/MAX9658 operate 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 as possible to the device. 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 approximately 300mV of headroom from either supply rail. The devices have an internal level-shift circuit that positions the sync tip at approximately 300mV at the output. 10 ______________________________________________________________________________________ Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/ MAX9658 GRAPHICS PROCESSING UNIT OR MPEG DECODER DAC 0.1μF LUMA IN0 GND OUT0 LPF* 75Ω MAX9657/MAX9658 VDD +3.3V 0.1μF 75Ω 220μF Y AV = 2V/V CLAMPREF DAC 0.1μF CHROMA IN1 OUT1 LPF* 75Ω 75Ω 220μF C AV = 2V/V CLAMPREF DAC 0.1μF CVBS IN2 OUT2 LPF* 75Ω 75Ω 220μF CVBS1 AV = 2V/V CLAMPREF 0.1μF IN3 OUT3 LPF* 75Ω 220μF CVBS2 AV = 2V/V CLAMPREF *LOWPASS FILTER IN MAX9658 ONLY. Figure 1. AC-Coupled Outputs Table 1. Quiescent and Average Power Consumption for MAX9657/MAX9658 MEASUREMENT POWER CONSUMPTION (mW) CONDITIONS Quiescent power consumption 69 No load. Average power consumption 200 150Ω to ground on each output. 50% flat field signal on each input. ______________________________________________________________________________________ 11 Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658 Typical Application Circuits +3.3V 0.1μF VDD MAX9657 SHDN 0.1μF IN0 OUT0 75Ω 0.1μF 75Ω 75Ω AV = 2V/V CLAMPREF 0.1μF IN1 OUT1 75Ω 75Ω AV = 2V/V CVBS INPUTS 0.1μF 75Ω 16x16 CROSSPOINT CLAMPREF 0.1μF IN2 OUT2 75Ω 0.1μF 75Ω 75Ω AV = 2V/V CLAMPREF 0.1μF IN3 OUT3 75Ω AV = 2V/V 0.1μF 75Ω 75Ω CLAMPREF GND NOTE: FOUR MAX9657s ARE REQUIRED BEFORE THE 16x16 CROSSPOINT. 12 ______________________________________________________________________________________ Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps +3.3V 0.1μF VDD MAX9658 SHDN 0.1μF IN0 OUT0 LPF 75Ω 0.1μF 75Ω 75Ω AV = 2V/V CLAMPREF 0.1μF IN1 OUT1 LPF 75Ω 75Ω AV = 2V/V CVBS INPUTS 0.1μF 75Ω QUADRUPLE VIDEO DECODER CLAMPREF 0.1μF IN2 OUT2 LPF 75Ω 0.1μF 75Ω 75Ω AV = 2V/V CLAMPREF 0.1μF IN3 OUT3 LPF 75Ω AV = 2V/V 0.1μF 75Ω 75Ω CLAMPREF GND ______________________________________________________________________________________ 13 MAX9657/MAX9658 Typical Application Circuits (continued) Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658 Pin Configuration Chip Information PROCESS: BiCMOS IN0 1 + 16 VDD IN1 2 IN2 3 15 N.C. MAX9657 MAX9658 14 OUT0 IN3 4 13 OUT1 N.C. 5 12 OUT2 N.C. 6 11 OUT3 N.C. 7 10 SHDN N.C. 8 9 GND QSOP 14 ______________________________________________________________________________________ Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps PACKAGE CODE DOCUMENT NO. 16 QSOP E16-4 21-0055 QSOP.EPS PACKAGE TYPE 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 ____________________ 15 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX9657/MAX9658 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.