MAXIM MAX7446 handbook
Contents
1. AES RAGA GME Aman BARES oe Ro ama M AALS 4 Channel Video Filter for RGB and CVBS Video General Description Features The MAX7446 4 channel buffered video reconstruction 4 Channel Filter and Buffer for RGB and filter is ideal for anti aliasing and DAC smocthing video CVBS Signals applications or wherever analog video is reconstructed from a digital data stream such as cable satellite ter Filter Response Ideal for NTSC PAL and restrial set top boxes DVD players hard disk recorders Interlaced SDTV Video Signals HDRs and personal video recorders PVRs This 43dB typ Stopband Attenuation at 27MHz device operates from a single 5V supply and has a flat passband out to 5MHz with a stopband attenuation 0 75dB max Passband Ripple Out to 5MHz Blanking Level Voltage on Cable lt 1V of 43dB at 27MHz This makes it ideal for use with NTSC PAL and standard definition digital TV SDTV Each Channel Drives Two 1502 Video Loads 5V Single Supply Voltage video systems Each output is capable of driving two Small 14 Pin TSSOP Package standard 150Q video loads The MAX7446 processes CVBS and RGB video signals The video output buffers have a fixed gain of 6dB The channel for CVBS video has high frequency boost circuitry that provides picture sharpness with 1 2dB of gain boost without degradation in the stopband The output 5 gt gt gt gt A video drivers2. 2003 Maxim Integrated Products Printed USA MAXIM is a registered trademark of Maxim Integrated Products
3. 1 5 150 ALIZED T NORMALIZED TO 0dB 80 2 0 200 1 10 00 0 1 1 10 01 1 10 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz MODULATED 12 5T RESPONSE GROUP DELAY vs FREQUENCY 2T RESPONSE 1 IRE 7 14mV 1 IRE 7 14mV 1 00 L MAX7446 toc05 MAX7446 toc06 90 g IN IN j a 250mV div 250mV div m a D S 70 S10 et I a i Ree Retr Eide le A fect oes OUT_ OUT_ 60 250mV div 250mV div 50 i it 0 1 10 200ns div 400ns div FREQUENCY MHz MAA 3 9PUDLXVIN MAX7446 4 Channel Video Filter for RGB and CVBS Video Typical Operating Characteristics continued Vcc 5V TA 25 C unless otherwise noted SUPPLY CURRENT vs TEMPERATURE DIFFERENTIAL GAIN MULTIBURST RESPONSE 420 3 03 MAX7446 toc09 INPUTS BIASED TO 2V gt Z 02 t NO LOAD 3 0 1 2 2 0 N Mi z 110 E 04 i 02 i 5 E 03 250mV div E3 E dst 2nd 4h 5th 6th g w g DIFFERENTIAL PHASE a E 03 ouT_ 2 a 0 250mV div 90 eB 0 1 0 ia 02 80 Z 03 hoatu 4 45 10 3 6 5 E Ist 2nd 4th 5th 6th 10us div TEMPERATURE C S Pin Description PIN NAME FUNCTION Channel A Video Input Use channel A for the CVBS video signal AC couple INA with a series 0 1uF capacitor Channel B Video Input Use channel B for the red R signal AC couple INB with a series 0 1uF capacitor 0 1uF capacitor Channel C Video Input Use channel C for the green G without sync signal AC couple INC wit
4. EW SEE RIATIONS y 2 85 315 ie a 0 8 0 z JEDEC VARIATIONS N a MILLIMETERS INCHES MIN MAX MIN MAX END VIEW ABT 16 D 4 90 5 10 193 201 X 2 85 315 112 124 ACT o D 6 40 6 60 252 260 bl pT TX 400 434 157 171 l AET JesiD 960 980 378 386 LT Ix 535 S565 21 222 WITH PLATING 1 c LEAD TIP DETAIL BASE METAL DETAIL A NOTES DIMENSIONS D AND E DO NOT INCLUDE FLASH MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 015mm PER SIDE 1 2 ee 3 CONTROLLING DIMENSION MILLIMETER 4 MEETS JEDEC OUTLINE MO 153 SEE JEDEC VARIATIONS TABLE SM LA X ASN 5 N REFERS TO NUMBER OF LEADS EXPOSED PAD FLUSH WITH BOTTOM OF PACKAGE WITHIN 002 PROPRIETARY INF ORATION THE LEAD TIPS MUST LIE WITHIN A SPECIFIED ZONE THIS TOLERANCE ZONE IS DEFINED BY TWO PARALLEL PLANES ONE PLANE IS THE SEATING PLANE PACKAGE QUTLINE TSSOP 4 40 MM BODY EXPOSED PAD DATUM C THE OTHER PLANE IS AT THE SPECIFIED DISTANCE FROM C C IN THE APPROVAL DOCUMENT CONTROL WO e YY DIRECTION INDICATED 21 0108 B A 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 6 Maxim Integrated Products 120 San Gabriel Drive Sunnyvale CA 94086 408 737 7600
5. cally connected to a 75Q series back match resistor followed by the video cable Because of the inherent divide by two of this configura tion the voltage on the video cable is always less than 1V complying with industry standard video require ments such as the European SCART standard which allows up to 2V of DC on the video cable The video buffer can also drive an AC coupled video load Good video performance is achieved with an output capacitor as low as 220pF Power Supply Bypassing and Layout The MAX7446 operates from a single 5V supply Bypass Vcc to GND with a 0 1uF capacitor Place all external components as close to the device as possible Exposed Pads The TSSOP EP package has an exposed pad on the bottom of the package This pad is electrically connect ed to GND and should be connected to the ground plane for improved thermal conductivity Do not route signals under this package Pin Configuration TOP VIEW MAXIM MAX7446 Chip Information TRANSISTOR COUNT 6300 PROCESS BiCMOS 9PUDLXVIN MAX7446 4 Channel Video Filter for RGB and CVBS Video Package Information The package drawing s in this data sheet may not reflect the most current specifications For the latest package outline information go to www maxim ic com packages N i 21 00 x a O a MMON DIMENSIONS E A lt Q 5 N n Y H EXPOSED DIE PAD BOTTOM VI
6. can be disabled with an external pin Ordering Information The MAX7446 is available in a 14 pin TSSOP package PART TEMP RANGE PIN PACKAGE with an exposed pad and is specified over the 40 C to E gt E 85 C extended temperature range MAX7446EUD 40 C to 85 C 14 TSSOP EP Applications EP Exposed pad Set Top Boxes HDRs Game Consoles Desktop Video Editors DVD Players Pin Configuration appears at end of data sheet Digital VCRs Functional Diagram G WITHOUT SYNC MAXI MI MAX7446 DISABLE MAXLAVI Maxim Integrated Products 1 For pricing delivery and ordering information please contact Maxim Dallas Direct at 1 888 629 4642 or visit Maxim s website at www maxim ic com 9PUDLXVIN MAX7446 4 Channel Video Filter for RGB and CVBS Video ABSOLUTE MAXIMUM RATINGS Vee t GND renei ieee araulicantaetin ale eld ania anode 6V Operating Temperature Range i All Other Pins to GND 0 3V to Vcc 0 3V Storage Temperature Range Maximum Current into Any Pin Except Vcc and GND 50mA Junction Temperature Continuous Power Dissipation Ta 70 C Lead Temperature soldering 10s TSSOP EP derate 20 8mW C above 70 C 1667mW 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
7. 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 Vcc 5V 5 CL 0 to 20pF RL 75Q to GND for DC coupled load RL 75Q to Vcc 2 for AC coupled load Cin_ 0 1pF TA TMIN to TMAX unless otherwise noted Typical values are at Vcc 5V TA 25 C PARAMETER SYMBOL CONDITIONS f 100kHz to 5MHz Channel A Passband Response dB relative to 100kHz Channels B C D 0 75 0 15 0 75 Stopband Attenuation f gt 27MHz 39 43 dB Differential Gain 5 step modulated staircase 0 15 0 50 Differential Phase 5 step modulated staircase 0 15 0 50 Degrees Peak signal 2Vp p to RMS noise f 100Hz to 50MHz Deviation from 100kHz_ Channel A to 4 1MHz Channels B C D Line Time Distortion HDIST 18us 100 IRE bar Field Time Distortion VDIST 130 lines 18us 100 IRE bar Clamp Settling Time tcLamPp To 1 Signal to Noise Ratio Group Delay Deviation Atg Output DC Clamp Level Channels B C D Low Frequency Gain Accuracy Av f 100kHz Low frequency channel to channel matching f 100kHz Low Frequency Gain Matching AV MATCH Low frequency channel to channel matching f 100kHz Channel to Channel Crosstalk f 100kHz to 3 58MHz Output Short Circuit Current OUT_ shorted to GND or Vcc Inpu
8. h a series DISABLE Channel D Video Input Use channel D for the blue B signal AC couple IND with a series 0 1uF capacitor Disable Logic Input A logic low on DISABLE enables the output buffers A logic high on DISABLE disables all output buffers and puts them in a high impedance state GND Ground Voc 5V Supply Input OUTD Channel D Video Output This output can be either AC or DC coupled OUTC Detailed Description The MAX7446 filters and buffers video encoder DAC outputs in applications such as set top boxes hard disk recorders DVD players and digital VCRs The MAX7446 reconstructs and cleans up analog video sig nals from the output of DAC video encoders Each channel consists of a lowpass filter and an output video buffer that drives two standard 150Q video loads Channel C Video Output This output can be either AC or DC coupled Channel B Video Output This output can be either AC or DC coupled Channel A Video Output This output can be either AC or DC coupled The MAX7446 is designed to process CVBS R G and B video signals The video signal processed by chan nel A CVBS must include a sync pulse This sync pulse provides the required timing to all four channels This device operates from a single 5V supply and has a nominal cutoff frequency of 5MHz optimized for NTSC PAL and SDTV MAXIM 4 Channel Video Filter for RGB and CVBS Video Filter Filter Respo
9. nse The reconstruction filter consists of two 2nd order Sallen Key stages The Butterworth type response features a maximally flat passband for NTSC and PAL bandwidths The stopband offers at least 43dB typ of attenuation at a video encoder DAC sampling frequency of 27MHz see the Typical Operating Characteristics High Frequency Boost The 1 2dB high frequency boost on channel A increas es image sharpness by compensating for signal degra dation and roll off in the video encoder Channels B C and D RGB do not boost high frequency signals and have a flat response over the video bandwidth Output Buffers Each output buffer has a fixed gain of 6dB and can drive two 150Q video loads with a 2Vp p signal The MAX7446 can drive an AC load or drive the video load directly without using a large output Capacitor The out put buffers drive DC loads with an output blanking level of less than 1V Output Clamp Level When a sync pulse is detected on channel A the DC restore loop is activated The function of the loop is to set the DC value of the video signal to a specified volt age See Table 1 for clamp levels Table 1 Output Clamp Level CHANNEL CLAMP LEVEL V 0 8 MAXIM Applications Information Input Considerations Use 0 1uF ceramic capacitors to AC couple the inputs These input capacitors store a DC level so the outputs are clamped to an appropriate DC voltage level Output Considerations The outputs are typi
10. t Leakage Current Group Delay Matching tg MATCH Channel A Channels B C D Input Dynamic Swing SUPPLY Supply Voltage Ran Supply Current No load Power Supply Rejection Ratio VIN 100mVp p f 0 to 3 5MHz 2 MAXIM 4 Channel Video Filter for RGB and CVBS Video ELECTRICAL CHARACTERISTICS continued Vcc 5V 5 CL 0 to 20pF RL 759 to GND for DC coupled load RL 75Q to Vcc 2 for AC coupled load Cin_ 0 1pF Ta Tmin to Tmax unless otherwise noted Typical values are at Vcc 5V Ta 25 C PARAMETER SYMBOL CONDITIONS DISABLE Output Impedance During Disable ZDISABLE At 5MHz Disable Logic Input High Voltage VIH Disable Logic Input Low Voltage VIL Disable Logic Input Current IDISABLE VIL OV sink VIH Vcc source Typical Operating Characteristics Vcc 5V Ta 25 C unless otherwise noted AMPLITUDE vs FREQUENCY PASSBAND AMPLITUDE vs FREQUENCY PHASE RESPONSE vs FREQUENCY 2 0 3 200 z 0 15 g 150 HIGH FREQUENCY BOOST T 1 0 100 oot a g a amp 05 50 a a g a 90 a M B 2 2 05 50 FLAT PASSBAND RESPONSE 60 1 0 100
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MAXIM MAX7446 handbook