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19-2750; Rev 0; 1/03
6-Channel Integrated Video Reconstruction Filters
General Description
The MAX7440/MAX7441/MAX7442 six-channel video reconstruction filters replace 30 or more discrete components. The devices are ideal for digital-to-analog converter (DAC) video reconstruction applications, when analog video is reconstructed from a digital data stream. The MAX7440/MAX7441/MAX7442 operate from a single +5V power supply. The inputs are DCcoupled from the DAC and the output can either be ACor DC-coupled. The DC-IN, DC-OUT architecture, leads to a perfect line-time distortion performance (zero tilt). The filters have a cutoff frequency optimized for PAL, NTSC, and SDTV video applications and offer three high-frequency boost options. The MAX7440 offers a flat passband response on all six channels; the MAX7441/MAX7442 offer high-frequency boost on the three channels used for CVBS and Y/C. The MAX7440/ MAX7441/MAX7442 are available in a 14-pin SO package and are fully specified over the extended temperature range.
Features
o Replace 30 or More Discrete Components o Ideal for CVBS, Y/C (S-Video), and RGB or Y Pb Pr Applications o 45dB Attenuation at 27MHz o -0.2dB Passband Response o Ideal for STBs with SCART Interface o +5V Single-Supply Voltage o Input Common-Mode Range Includes GND o DC-Coupled Input, DC/AC-Coupled Output o 14-Pin SO Package
MAX7440/MAX7441/MAX7442
Ordering Information
PART MAX7440ESD MAX7441ESD TEMP RANGE PINPACKAGE HIGHFREQUENCY BOOST No Yes Yes
Applications
STB DVDs Hard Disk Recorders PVR SCART Video Applications General Video Filtering
+5V
-40C to +85C 14 SO -40C to +85C 14 SO
MAX7442ESD* -40C to +85C 14 SO *Future product--contact factory for availability.
Typical Application Circuit
0.1F ENCODER 1F MAX7440 MAX7441 MAX7442 IN1 LOWPASS FILTER WITH HF BOOST* A = +1V/V OUT1 A/V SWITCHING DEVICE (MAX4399) OR BUFFERS 75 75
D/A
D/A
IN2
LOWPASS FILTER
A = +1V/V
OUT2
75
75
D/A
IN3
LOWPASS FILTER
A = +1V/V
OUT3
75
75
D/A
IN4
LOWPASS FILTER
A = +1V/V
OUT4
75
75
D/A
IN5
LOWPASS FILTER WITH HF BOOST*
A = +1V/V
OUT5
75
75
D/A
IN6
LOWPASS FILTER WITH HF BOOST*
A = +1V/V
OUT6
75
75
*MAX7440 HAS FLAT RESPONSE, MAX7441/MAX7442 INCLUDES HF BOOST.
________________________________________________________________ Maxim Integrated Products
1
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6-Channel Integrated Video Reconstruction Filters MAX7440/MAX7441/MAX7442
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................................+6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) Maximum Current into Any Pin .........................................50mA Continuous Power Dissipation (TA = +70C) 14-Pin SO (derate 8.3mW/C above +70C)..............666.7mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
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 5%, RL = 5k, CL = 0 to 20pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER SYMBOL CONDITIONS DC to 3.5MHz, MAX7440/MAX7441 (channels 2, 3, 4) Passband Response DC to 5MHz, MAX7440/MAX7441 (channels 2, 3, 4) Stopband Attenuation Asb f = 27MHz +1dB HF boost, MAX7441 Boost Amplitude f = 4.5MHz +2dB HF boost, MAX7442 Differential Gain Differential Phase Signal-to-Noise Ratio dG dB SNR 5-step modulated staircase 5-step modulated staircase Peak signal (1VP-P) to RMS noise, f = 10Hz to 100MHz Low-frequency channel-to-channel matching, f = 200kHz Channels 2, 3, 4 Channels 1, 5, 6 MAX7440/MAX7441/ MAX7442 Group Delay Deviation g Deviation from 100kHz to 4.5MHz MAX7441 (channels 1, 5, 6) MAX7442 (channels 1, 5, 6) Line-Time Distortion Field-Time Distortion Low-Frequency Gain Variation Low-Frequency Gain Low-Frequency Gain Matching Input Voltage Range Channel-to-Channel Crosstalk Input Leakage Current XTALK IIN Channel-to-channel crosstalk, DC to 5MHz VIN = 0V 2 tg f = 100kHz -3 0 71 6 25 Hdist Vdist AV 18s, 100IRE bar 130 lines, 18s, 100IRE bar Gain at f = 100kHz -3 -4 -0.25 0.975 +3 1.75 1.2 0.05 0.05 71 2 ns 2 10 17 17 0 +3 +4 +0.25 mV mV dB V/V % V dB A ns % Degrees dB -0.80 37 0.4 -0.5 45 0.60 0.91 dB 0 dB MIN -0.40 TYP -0.2 MAX +0.10 dB UNITS
Group Delay Matching
tg(MATCH)
2
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6-Channel Integrated Video Reconstruction Filters
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V 5%, RL = 5k, CL = 0 to 20pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Resistance Input Capacitance Supply Voltage Range Supply Current Power-Supply Rejection Ratio DC Level Shift VCC ICC PSRR VCC = +5.5V, no load VIN = 100mVP-P OUT_ to IN_ DC f = 0 to 1MHz 4.75 57 39 30 0.85 1.05 SYMBOL CONDITIONS MIN 200 20 5.25 78 TYP MAX UNITS k pF V mA dB V
MAX7440/MAX7441/MAX7442
Typical Operating Characteristics
(VCC = +5V, RL = 5k, TA = +25C, unless otherwise noted.)
AMPLITUDE vs. FREQUENCY
MAX7440 toc01
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7440 toc02
PHASE RESPONSE vs. FREQUENCY
150 100
MAX7440 toc03
0 -10 -20 AMPLITUDE (dB)
2 0 AMPLITUDE (dB) -2 -4 -6 -8 -10
200
PHASE (DEGREES) 1 FREQUENCY (MHz)
50 0 -50 -100 -150 -200
-30 -40 -50 -60 -70 0.1 1 10 100 FREQUENCY (MHz)
0.1
10
0.1
1 FREQUENCY (MHz)
10
GROUP DELAY vs. FREQUENCY
MAX7441 (CHANNELS 2, 3, 4) 70 GROUP DELAY (ns)
MAX7440toc04
2T RESPONSE (1IRE = 7.14mV)
MAX7440 toc05
MODULATED 12.5T RESPONSE (1IRE = 7.14mV)
MAX7440 toc06
80
IN_ 200mV/div
IN_ 200mV/div
60 OUT_ 200mV/div OUT_ 200mV/div
50
40 0.1 1 FREQUENCY (MHz) 10 200ns/div 400ns/div
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3
6-Channel Integrated Video Reconstruction Filters MAX7440/MAX7441/MAX7442
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 5k, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX7440 toc07
DIFFERENTIAL GAIN
DIFFERENTIAL GAIN (%) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 2 3 4 5 6 7 2 3 4 5 6 7
MAX7440 toc08
SIGNAL SWING vs. LOAD
4.0 SIGNAL SWING (VP-P) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 200 1000 1800 2600 LOAD () 3400 4200 5000
MAX7440 toc09
62 60 SUPPLY CURRENT (mA) 58 56 54 52 50 -40 -15 10 35 60
4.5
DIFFERENTIAL PHASE
DIFFERENTIAL PHASE (DEGREES)
85
TEMPERATURE (C)
CHANNEL-TO-CHANNEL CROSSTALK vs. FREQUENCY
MAX7440toc10
GROUP DELAY MATCHING DISTRIBUTION
MAX7440 toc11
INPUT/OUTPUT LEVEL SHIFT vs. TEMPERATURE
MAX7440 toc12
-65
50 20 SAMPLES PERCENTAGE OF UNITS (%) 40
950
-70
910 LEVEL SHIFT (mV)
AMPLITUDE (dB)
-75
30
870
-80
20
830
-85
10
790
-90 0.1 1 FREQUENCY (MHz) 10
0 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 GROUP DELAY (ns)
750 -40 -15 10 35 60 85 TEMPERATURE (C)
MULTIBURST RESPONSE
MAX7440 toc13
OUT_ 200mV/div
10s/div
4
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6-Channel Integrated Video Reconstruction Filters
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NAME IN1 IN2 IN3 VCC IN4 IN5 IN6 OUT6 OUT5 OUT4 GND OUT3 OUT2 OUT1 Channel 2 Filter Input Channel 3 Filter Input +5V Power Supply. Bypass to GND with a 0.1F and 1F capacitor. Channel 4 Filter Input Channel 5 Filter Input (Optional Boosted Channel) Channel 6 Filter Input (Optional Boosted Channel) Channel 6 Filter Output Channel 5 Filter Output Channel 4 Filter Output Ground Channel 3 Filter Output Channel 2 Filter Output Channel 1 Filter Output FUNCTION Channel 1 Filter Input (Optional Boosted Channel)
MAX7440/MAX7441/MAX7442
Detailed Description
The MAX7440/MAX7441/MAX7442 filter the outputs of DAC encoder chipsets that process digital video information in applications such as set-top boxes, hard disk recorders, DVD players, DVD recorders, and digital VCRs. These devices also filter and clean up analog video signals by rejecting out-of-band noise. Each channel in the MAX7440/MAX7441/MAX7442 includes a 4th-order lowpass filter and a gain of +1V/V output stage, as shown in the Typical Application Circuit.
Output Stage
The output stages of the MAX7440/MAX7441/MAX7442 are designed to drive 1VP-P signals into high-impedance (>5k) loads. They require external buffers to drive standard video cables. Most standard audio/ video switching devices include these buffers for STB applications.
Applications Information
MAX7440/MAX7441/MAX7442 with an A/V Switching Device
The MAX7440/MAX7441/MAX7442 are designed to directly interface to an audio/video switching device used in video applications (i.e., STBs) with SCART interfaces (see Typical Application Circuit). The output of the analog filters can drive the high-impedance load of the switching device. The switching device provides the buffering to drive standard 150 video loads.
Filter
Filter Response Each channel of the reconstruction filter consists of a 4th-order Sallen-Key filter configured as two 2nd-order stages. The filter features a maximally flat passband for NTSC, PAL, and SDTV bandwidths. The stopband offers typically 45dB of attenuation at sampling frequencies of 27MHz and above (see Typical Operating Characteristics). The filter exhibits a Butterworth-type response resulting in excellent group delay deviation performance. High-Frequency Boost The high-frequency (HF) boost compensates for signal degradation and rolloff in the signal path prior to the filter. This performance increases the image sharpness. The MAX7441/MAX7442 offer a high-frequency boost on channels OUT1, OUT5, and OUT6.
MAX7440/MAX7441/MAX7442 with External Buffers
External buffering is required for the MAX7440/ MAX7441/MAX7442 to drive standard 150 video loads. Figure 1 shows the MAX4394 triple op amp, configured with a gain of +2V/V to drive standard video loads from the MAX7440/MAX7441/MAX7442.
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5
6-Channel Integrated Video Reconstruction Filters MAX7440/MAX7441/MAX7442
VCC +5V
0.1F
1F
ENCODER
MAX7440 MAX7441 MAX7442
IN1 LOWPASS FILTER A = +1V/V OUT1 IN
DISABLE
D/A
75
MAX4394
ZO = 75
OUT1 75
510
510
DISABLE D/A IN6 LOWPASS FILTER A = +1V/V OUT6 IN 75
MAX4394
ZO = 75
OUT6 75
510
510
Figure 1. Typical Application Circuit with External Buffers
Pin Configuration
TOP VIEW
IN1 1 IN2 IN3 2 3 14 OUT1 13 OUT2 12 OUT3
Power-Supply Bypassing and Layout
The MAX7440/MAX7441/MAX7442 operate from a single +5V supply. Bypass VCC to GND with a 0.1F and 1F capacitor. These capacitors filter all frequencies over 1MHz. Place all external components as close to the devices as possible. To maintain good crosstalk performance ensure that input and output lines do not run parallel for any distance. If it is necessary to have parallel lines, run a ground trace in between each line. Refer to the MAX7440 Evaluation Kit for a proven PC board layout example.
VCC 4 IN4 5 IN5 6 IN6 7
MAX7440 MAX7441 MAX7442
11 GND 10 OUT4 9 8 OUT5 OUT6
Chip Information
TRANSISTOR COUNT: 3691 PROCESS: BiCMOS
SO
6
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6-Channel Integrated Video Reconstruction Filters
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.)
SOICN .EPS
MAX7440/MAX7441/MAX7442
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D C
A e B A1
0 -8 L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
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.
7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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