MAXIM MAX11501/MAX11502 handbook
Contents
1. 19 3002 Rev 1 4 08 oN KIT AVAILABLE General Description The MAX11501 MAX11502 integrated filters offer three channels of 5th order filters for standard definition video and include 6dB output buffers on each chan nel These video filters are ideal for anti aliasing and DAC smoothing in applications such as set top boxes security systems digital video recorders DVRs DVD players and personal video recorders The MAX11501 MAX11502 video inputs feature a trans parent clamp compatible with AC and DC coupled input signals and allow DAC outputs to be directly cou pled The 5th order filters provide a typical 3dB band width of 8 6MHz MAX11501 and 8 9MHz MAX11502 and offer either a flat passband response MAX11501 or a 0 8dB peaking passband response 11502 on all channels Each channel includes an output buffer with a gain of 6dB capable of driving a full 2Vp p video signal into two standard 1500 750 back terminated video loads The buffers drive either AC or DC coupled loads and assure a blanking level of below 1V after the back match resistor The MAX11501 MAX11502 operate from a single 5V supply and are available in the upper commercial 0 C to 85 C temperature range These devices are avail able in small 8 pin SO packages Applications Set Top Box Receivers Digital Video Recorders DVRs Security Video Systems SDTV DVD Players Personal Video Recorders Video On Demand T2. AFTER BACKMATCH RESISTOR FREQUENCY MHz AVLAZCL AVI 3 cOSLLXVW LOSLLXVIMW MAX11501 MAX1 1502 Three Channel Standard Definition Video Filters Typical Operating Characteristics continued Vcc 5V RL 1500 to GND output DC coupled Ta 25 C MAX11502 MAX11502 MAX11502 PASSBAND RESPONSE GROUP DELAY DIFFERENTIAL GAIN NTSC 9 e 120 0 2 5 100 5 E 6 x amp 80 g z E a 0 ea Es Lu 40 ma ce 0 0 1 20 3 0 0 2 04 1 10 01 1 0 100 1 2 3 4 5 6 7 FREQUENCY MHz FREQUENCY MHz STEP MAX11502 MAX11502 DIFFERENTIAL PHASE NTSC 2T RESPONSE 4 x MAX11501 toc14 zs d 5 d 02 a CHI E t E 5 i 0 CH2 i 01 1 2 3 4 5 6 7 20005 STEP CH2 OUTPUT AFTER BACKMATCH RESISTOR MAX11502 MAX11502 MODULATED 12 5T RESPONSE MULTIBURST RESPONSE 11501 toc15 1501 10016 CH1 CH2 DOns div 1 1095 0 CH2 OUTPUT AFTER BACKMATCH RESISTOR CH2 OUTPUT AFTER BACKMATCH RESISTOR 4 MAKI Three Channel Standard Definition Video Filters Pin Description FUNCTION Video Input Channel 1 Video Input Channel 2 Video Input Channel 3 Power Supply Ground Video Output Channel 3 Video Output Channel 2 OUT Video Output Cha
3. 2 OUT_ 220uF 75Q OPTIONAL Figure 5 Typical Output Loads AVLAZCLA The MAX11501 MAX11502 outputs are fully protected against short circuits to ground The short circuit pro tection circuitry limits the output current to 80mA typi cal per output Shorting more than one output to ground simultaneously may exceed the maximum package power dissipation Junction Temperature Calculations Die temperature is a function of quiescent power dissi pation and the power dissipation in the output drivers Calculate the power dissipated Pp using Ppot where Pps is the quiescent power dissipated in the die and given by Pps Vcc x Icc and where is the power dissipated in the nth dri ver stage and given by Vec Vormsn Rin PDOn where VORMSn is the RMS output voltage and Rin is the load resistance The following is an example of a junction temperature calculation assuming the following conditions 1 Video standard 525 60 2 1 2 Video format RGB with syncs on all 3 Picture content 100 white 4 The input signal is AC coupled 5 The output signal is DC coupled 6 Vcc 5 0V 7 ICC 26mA 220uF MAXIM OPTIONAL MAX11501 MAX11502 QUT 220uF 759 OPTIONAL COSEEXVIN LOSEELXVIN MAX11501 MAX1 1502 Three Channel Standard Definition Video Filters A sync tip exists at 280mV and peak white ex
4. AX11501 and 8 9MHz MAX1 1502 guarantee minimal attenuation in the passband while at the same time offering a 27MHz attenuation of typically 50dB MAX11501 and 48dB MAX11502 Output Buffer The MAX11501 MAX11502 feature output buffers with 6 of gain A typical load Figure 5 a is a 750 back match resistor an optional 220yF or larger AC coupling capacitor a transmission line and a 75Q termination resistor The MAX11501 MAX11502 clamp the signal forcing the blanking level to less than 1V at the termina tion resistor This allows direct drive of video loads at digital TV specifications without the need for costly AC coupling capacitors The MAX11501 MAX11502 drive two parallel loads per output Figure 5 b but thermal considerations must be taken into account when doing so see the Junction Temperature Calculations section Applications Information Output Configuration The MAX11501 MAX11502 outputs may be either DC or AC coupled When the outputs are AC coupled choose a capacitor that passes the lowest frequency content of the video signal and keeps the line time distortion within desired limits The capacitor value is a function of the input leakage and impedance of the circuit being driven The MAX11501 MAX11502 easily drive the industry com mon 2201 or larger coupling capacitor If any or all outputs are driving two parallel loads see the Junction Temperature Calculations section MAXIM MAX11501 MAX1150
5. SLLXVW LOSLLXVM
6. When AC coupling the inputs place the capacitors as close as possible to the device and keep traces short to minimize parasitic capaci tance and inductance For a recommended PCB lay out refer to the MAX11501 MAX11502 evaluation kit datasheet MAKLM Three Channel Standard Definition Video Filters Pin Configuration TOP VIEW MAX11501 MAX11502 Typical Operating Circuit MAXIM MAX11501 ENCODER MAX11502 RANSPARENT 9MHz 5TH ORDER CLAMP BUTTERWORTH FILTER 750 OPTIONAL CAPACITORS AVLAZCLA 9 cOSLLXVW LOSLLXVM MAX11501 MAX1 1502 Three Channel Standard Definition Video Filters Package Information For the latest package outline information go to www maxim ic com packages PACKAGE TYPE PACKAGE CODE DOCUMENT NO 8 SO 58 2 21 0041 10 MAXIM Three Channel Standard Definition Video Filters Revision History REVISION REVISION PAGES NUMBER DATE DESCRIPTION CHANGED 12 07 Initial release 4 08 Updated Block Diagram 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 11 2008 Maxim Integrated Products MAXIM js registered trademark of Maxim Integrated Products Inc cO
7. cept Vcc and GND 50mA Operating Temperature Range MAX115Q USA eee dte 0 C to 85 C Storage Temperature Range 65 C to 150 C Lead temperature soldering 10s Junction Temperature sss 150 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 Vcc 5V RLOAD 150 to GND Cin TA 0 C to 85 C frequency response is relative to 100kHz unless otherwise noted PARAMETER SYMBOL 1dB Bandwidth MAX11502 CONDITIONS 11501 MAX11501 Bandwidth MAX11502 11501 f 27MHz Stopband Attenuation MAX11502 f 27MHz Low Frequency Gain Input Voltage Range Referenced to GND if DC coupled Differential Gain All channels Differential Phase Total Harmonic Distortion All channels Vour 1 8Vp p f 1MHz all channels Degrees Channel to Channel Crosstalk f 1MHz Signal to Noise Ratio Propagation Delay f 4 5MHz NTC 7 weighting 100kHz 4 2MHz Supply Voltage Range Supply Current No load Power Supply Rejecti
8. ists at 2 28V The RMS voltage is approximately 1 88V on each output 80 of the peak to peak voltage plus the offset giving 5 x 0 026 0 13W 5 1 88 x 1 88 75 Poon 0 078W and Pp 0 13 0 078 0 078 0 078 0 364W The junction temperature is given by TJ ReJA x PD where Ty is junction temperature TA is ambient temper ature assume 70 and RgJA is thermal resistance junction to ambient From the Absolute Maximum Ratings section of the data sheet the derating factor is 5 9mW C above 70 C ReJA 1 derating factor 1 5 9mW C 170 C W derating and maximum power dissipation are based on minimum PCB copper and indicate worst case Therefore TJ 70 170 x 0 364 132 In this example the die temperature is below the absolute maximum allowed temperature It is unlikely under normal circumstances that the maximum die temperature will be reached however it is possible if tolerances of Vcc RL input voltage etc are consid ered and the ambient temperature is high Changing the above example to a single video load on each output results in Ty 112 C PCB Layout Recommendations To help with heat dissipation connect the power and ground traces to large copper areas Bypass Vcc to GND with 0 1uF and 1 0uF capacitors Surface mount capacitors are recommended for their low inductance Place traces carrying video signals appropriately to avoid mutual coupling
9. nnel 1 Detailed Description Each channel of the MAX11501 MAX11502 contains a transparent input clamp an 8 6MHz MAX11501 or 8 9MHz MAX11502 5th order lowpass filter and an MAXIM MAX11501 MAX11502 INPUT SIGNAL Figure 1 Typical AC Coupled Signal AVLAZCLA output amplifier with a gain of two see the Typical Operating Circuit The MAX11501 provides a flat pass band response and the MAX11502 features a 0 8dB high frequency boost at 5MHz on all channels to help with system roll off Within the passband each channel amplifies the signal by two and adds 280mV of offset VOUT 2 x VIN 0 28V Typical voltage levels are shown in Figures 1 and 2 Inputs Transparent Clamps All inputs feature transparent clamps to allow either AC or DC input coupling The clamp remains inactive while the input signal is above ground offering true DC input coupling If the signal goes below ground as when the signal is AC coupled the internal clamp sets the sync tip at slightly below the ground level OUTPUT SIGNAL cOSLLXVW LOSLLXVM MAX11501 MAX1 1502 Three Channel Standard Definition Video Filters MAXUM MAX11501 MAX11502 INPUT SIGNAL Figure 2 Typical DC Coupled Signal Input Coupling The choice of AC or DC coupling the input depends on the video source Many DACs provide a current out put and are terminated to ground with a resistor Such DAC outputs are conveniently DC coupled t
10. o the MAX11501 MAX11502 Use AC coupling when the DC level of the video signal is unknown or outside the specified input range of the MAX11501 MAX11502 such as SCART or Vcc terminated DAC outputs DC Coupled Inputs If the input is DC coupled the input voltage must remain above zero but not exceed the maximum input voltage of 1 4V typical AC Coupled Inputs If the input is AC coupled the transparent clamps are active and set the lowest point of the signal at ground This is appropriate for unipolar signals such as Y R G or B with or without sync pulses Figure 3 For bipolar signals such as Pb and Pr bias the AC cou pled inputs to a fixed DC voltage typically 0 59V to ensure that the transparent clamp remains off A suitable network is shown in Figure 4 Determine the bias voltage using R2 ma L R VB where IL is the input leakage current typically 0 5 6 OUTPUT SIGNAL MAXIM 11501 11502 MAXIM 1501 MAX11502 Figure 4 AC Coupling for Bipolar Signals Pb Pr MAKLM Three Channel Standard Definition Video Filters Standard Definition Filters The MAX11501 MAX11502 filters are optimized to deliver a flat MAX11501 or high frequency boosted 1 1502 passband and high stopband attenuation The filter char acteristics have been chosen to provide excellent time domain response with low overshoot The typical 3dB fre quency of 8 6MHz M
11. on Ratio DC all channels MAXIM Three Channel Standard Definition Video Filters Typical Operating Characteristics Vcc 5V RL 1500 to GND output DC coupled Ta 25 C MAX11501 MAX11501 MAX11501 FREQUENCY RESPONSE PASSBAND RESPONSE GROUP DELAY 10 9 120 0 E 5 100 3 10 6 a 20 ao P 80 2 9 amp 60 5 5 ES 40 50 0 20 60 70 3 0 01 10 100 01 1 10 01 1 0 100 FREQUENCY MHz FREQUENCY MHz FREQUENCY MHz MAX11501 MAX11501 MAX11501 DIFFERENTIAL GAIN NTSC DIFFERENTIAL PHASE NTSC 2T RESPONSE 02 04 MAX11501 toc06 8 03 E 01 8 0 E E o te al 0 1 j CH 02 i 1 2 3 4 5 6 7 1 2 3 4 5 6 7 ct lt input 209 8 STEP STEP CH2 OUTPUT AFTER BACKMATCH RESISTOR MAX11501 MAX11501 MAX11502 MODULATED 12 5T RESPONSE MULTIBURST RESPONSE FREQUENCY RESPONSE MAX11501 10007 MAX11501 toc08 10 0 2 3 10 8 20 i CHI 30 I E 40 50 CH2 60 CH2 MA Sy INPUT 400ns div INPUT 10us div 0 1 1 0 100 CH2 OUTPUT AFTER BACKMATCH RESISTOR CH2 OUTPUT
12. ypical Operating Circuit and Pin Configuration appear at end of data sheet MAKIM MAKII Three Channel Standard Definition Video Filters Features Three Channel 5th Order 9MHz Filter for Standard Definition Video 6dB Output Buffers Transparent Input Clamp AC or DC Coupled Inputs AC or DC Coupled Outputs Flat Passband Response MAX11501 0 8dB Peaking Passband Response MAX11502 on All Channels 12kV HBM ESD Protection on Outputs Single 5V Power Supply Small 8 Pin SO Package 9 Ordering Information PIN FREQUENCY PACKAGE RESPONSE MAX11501USA 8 SO Flat MAX11502USA 8 SO HF Boost Denotes a lead free package Note All devices are specified over the 0 C to 85 C operat ing temperature range PART Block Diagram T MAXUM MAX11501 MAX11502 V 9MHz 5TH ORDER BUTTERWORTH FILTER gt TRANSPARENT CLAMP Maxim Integrated Products 1 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 cOSLLXVW LOSLLXVM MAX11501 MAX1 1502 Three Channel Standard Definition Video Filters ABSOLUTE MAXIMUM RATINGS pp 0 3V to 6V All other pins to GND 0 3V to the lower of Vcc 0 3V and 6V Continuous Power Dissipation TA 70 C 8 Pin SO derate 5 9mW C above 70 470mW Maximum Current into any Pin Ex
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MAXIM MAX11501/MAX11502 handbook