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19-2749; Rev 0; 1/03
Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
General Description
The MAX7443/MAX7444 are low-cost, triple-channel video reconstruction filters for S-video and CVBS video signals. These devices are ideal for anti-aliasing and DAC smoothing video applications such as set-top boxes, DVD players, hard-disk recorders (HDRs), and personal video recorders. These filters operate from a single +5V supply. They are optimized for NTSC, PAL, and standard-definition digital TV (SDTV) video systems. Each channel consists of a lowpass filter and an adjustable-gain output buffer capable of driving two standard 150 video loads. The output buffers can drive either an AC or a DC load such that the blanking level voltage after the backmatch resistor is less than 1V. The Y and C video inputs are summed to produce the composite video output. The MAX7444 offers highfrequency boost to improve picture sharpness. The MAX7443 has a maximum flat-frequency response. The MAX7443/MAX7444 are available in a tiny 8-pin thin QFN and an 8-pin SO package with exposed pad, and are fully specified over the -40C to +85C extended temperature range.
Features
o Triple-Channel Filter and Buffer for CVBS and Y/C (S-Video) o Filter Response Ideal for NTSC, PAL, and Interlaced SDTV Signals o 41dB (typ) Stopband Attenuation at 27MHz o -0.3dB (typ) Passband Response o Low Blanking Level Voltage Allows DC-Coupled Output o Each Channel Drives Two 150 Video Loads o +5V Single-Supply Voltage o Tiny 8-Pin Thin QFN or 8-Pin SO Packages
MAX7443/MAX7444
Ordering Information
PART MAX7443ETA MAX7443ESA MAX7444ETA MAX7444ESA TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 Thin QFN-EP* 8 SO-EP* 8 Thin QFN-EP* 8 SO-EP* TOP MARK AFX -- AFY --
Applications
Set-Top Boxes/HDR/DVD Security Cameras/Digital Cameras Game Consoles Digital VCRs Every Composite, S-Video Output for NTSC, PAL, SDTV
*EP = Exposed pad. Selector Guide appears at end of data sheet.
Functional Diagram
VCC * ENCODER YIN D/A LOWPASS FILTER 6dB/ 9.5dB/ 12dB YOUT *
*
MAX7443 MAX7444
6dB/ 9.5dB/ 12dB
CVOUT
*
D/A
CIN
LOWPASS FILTER GND
6dB/ 9.5dB/ 12dB
COUT
* *
GSET
*OPTIONAL
________________________________________________________________ Maxim Integrated Products
1
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7443/MAX7444
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................................+6V All Other Pins to GND.................................-0.3V to (VCC + 0.3V) Maximum Current into Any Pin Except VCC and GND .....50mA Continuous Power Dissipation (TA = +70C) 8-Pin Thin QFN (derate 24.4mW/C above +70C) ...1951mW 8-Pin SO (derate 18.9mW/C above +70C)..............1509mW 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%, CL = 0 to 20pF, RL = 75 to GND for DC-couple, RL = 75 to VCC/2 for AC-couple, CYIN = CCIN = 0.1F, TA = TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Passband Response Stopband Attenuation Boost Amplitude Differential Gain Differential Phase dG d ASB SYMBOL CONDITIONS f = 100kHz to 4.2MHz, relative to 100kHz f = 27MHz f = 4.2MHz, MAX7444 5-step modulated staircase 5-step modulated staircase Peak signal (2VP-P) to RMS noise, f = 100Hz to 50MHz Deviation from 100kHz to 4.1MHz 18s, 100 IRE bar 130 lines, 18s, 100 IRE bar To 1% YOUT Output DC Clamp Level Low-Frequency Gain Accuracy Group Delay Matching Channel-to-Channel Crosstalk Input Leakage Current AV tg(MATCH) XTALK IIN CVOUT COUT f = 100kHz, relative to 6dB Low-frequency channel-to-channel matching, f = 100kHz for YOUT and COUT f = 100kHz to 3.58MHz, gain = 6dB 0.6 0.6 1.44 -3.5 2 61 10 0.8 0.8 1.6 Gain = 6dB, 9.5dB, 12dB Gain = 6dB, 9.5dB, 12dB Gain = 6dB, 9.5dB, 12dB MAX7443 MAX7444 67 MAX7443 MAX7444 MIN -0.8 -0.1 39 TYP -0.3 +0.6 41 0.6 0.15 0.15 0.4 0.4 MAX +0.1 +0.92 UNITS dB dB dB % Degrees
Signal-to-Noise Ratio
SNR
73 8 12 20 30 0.3 0.5 100 1.0 1.0 1.97 +2
dB
Group Delay Deviation Line-Time Distortion Field-Time Distortion Clamp Settling Time
tg HDIST VDIST
ns % % Lines V % ns dB A
2
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V 5%, CL = 0 to 20pF, RL = 75 to GND for DC-couple, RL = 75 to VCC/2 for AC-couple, CYIN = CCIN = 0.1F, TA = TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Dynamic Swing SUPPLY Supply Voltage Range Supply Current Power-Supply Rejection Ratio VCC ICC PSRR VCC = +5.25V, no load VIN = 100mVP-P, f = 0 to 3.5MHz 4.75 88 33 5.25 110 V mA dB SYMBOL YINP-P CINP-P CONDITIONS GSET = GND (6dB) GSET = GND (6dB) MIN TYP MAX 1.2 0.9 UNITS VP-P
MAX7443/MAX7444
Typical Operating Characteristics
(VCC = +5V, TA = +25C, unless otherwise noted.)
AMPLITUDE vs. FREQUENCY
MAX7443/44 toc01
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7443/44 toc02
PHASE RESPONSE vs. FREQUENCY
150 100 PHASE (DEGREES) 50 0 -50 -100 -150
MAX7443/44 toc03
2.0 1.5 1.0 AMPLITUDE (dB) 0.5 0 -0.5 -1.0 MAX7443 MAX7444
200
0
AMPLITUDE (dB)
-20
-40
-60 NORMALIZED TO 0dB -80 1 10 FREQUENCY (MHz) 100
-1.5 NORMALIZED TO 0dB -2.0 0.1 1 FREQUENCY (MHz) 10
-200 0.1 1 FREQUENCY (MHz) 10
GROUP DELAY vs. FREQUENCY
MAX7443/44 toc04
2T RESPONSE (1 IRE = 7.14mV)
MAX7443/44 toc05
MODULATED 12.5T RESPONSE (1 IRE = 7.14mV)
MAX7443/44 toc06
90
80 GROUP DELAY (ns)
70
YIN 200mV/div
YIN 200mV/div
60 YOUT 200mV/div
50
YOUT 400mV/div 0.1 1 FREQUENCY (MHz) 10
40 200ns/div 400ns/div
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3
Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7443/MAX7444
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
DIFFERENTIAL PHASE (DEGREES) DIFFERENTIAL GAIN (%)
MAX7443/44 toc07
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 YOUT 200mV/div
MAX7443/44 toc08
MULTIBURST RESPONSE
YIN 200mV/div
MAX7443/44 toc09
90
85 SUPPLY CURRENT (mA)
80
DIFFERENTIAL PHASE
75
70
65 -40 -15 10 35 60 85 TEMPERATURE (C)
10s/div
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME YIN GSET CIN GND VCC COUT CVOUT YOUT FUNCTION Luma (Y) Input Gain-Setting Control Input. See Table 1 for values. Chroma (C) Input Ground 5V Power Supply Chroma (C) Output Composite Video Output Luma (Y) Output
These devices operate from a single +5V supply. The filters have a nominal cutoff frequency optimized for NTSC, PAL, and SDTV.
Filter
Filter Response 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 41dB (typ) of attenuation at sampling frequencies of 27MHz and above (see Typical Operating Characteristics). High-Frequency Boost The high-frequency boost available in the MAX7444 compensates for signal degradation and rolloff in the video encoder, which increases the image sharpness. The MAX7443 has a flat response over the video bandwidth.
Detailed Description
The primary function of the MAX7443/MAX7444 is to filter and buffer the encoder DAC outputs that contain digital video information in applications such as set-top boxes, hard-disk recorders, DVD players, and digital VCRs. These devices reconstruct and clean up analog video signals. Each MAX7443/MAX7444 consists of a lowpass filter and an adjustable-gain output video buffer that is capable of driving two standard 150 video loads. The luma (YIN) and chroma (CIN) video inputs are summed internally to provide the composite (CVOUT) video output.
Output Buffer
The output buffer drives two 150 video loads with a 2VP-P signal. The adjustable gain of the output buffer provides a gain of 6dB, 9.5dB, and 12dB, which are selected by tying the GSET pin to GND, VCC, or floating, respectively. The MAX7443/MAX7444 can drive an AC load or drive the video load directly without using the large output capacitor. The output buffer drives a DC load with an output blanking level of less than 1V.
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
Table 1. Gain-Setting Control
GSET GND VCC Open GAIN (dB) 6 9.5 12 PART MAX7443ETA MAX7443ESA MAX7444ETA MAX7444ESA
Selector Guide
HIGH-FREQUENCY BOOST No No Yes Yes
MAX7443/MAX7444
12dB Gain Setting The GSET pin is biased internally to VCC/2 through two 100k resistors from VCC to GND. The internal impedance at the node is 50k. No additional connection is necessary since the pin offers a minimum noise margin immunity of 1VP-P.
Pin Configurations
TOP VIEW
Output Clamp Level
When sync pulses in the luma signal (Y) are detected, the DC restore loop is activated. The function of the loop is to set the sync tip of the video signal to the desired DC level of 0.8V for YOUT and COUT and the average DC voltage of COUT at 1.6V.
YIN GSET CIN GND
1 2 3 4 MAX7443 MAX7444
8 7 6 5
YOUT CVOUT COUT VCC
Applications Information
THIN QFN
Input Considerations
Use a 0.1F ceramic capacitor to AC-couple the input to the MAX7443/MAX7444. This input capacitor stores a DC level such that the outputs are clamped to the appropriate DC voltage level.
YIN GSET CIN GND 1 2 3 4 MAX7443 MAX7444 8 7 6 5 YOUT CVOUT COUT VCC
Output Considerations
The outputs of the MAX7443/MAX7444 are typically connected to a 75 series back-match resistor followed by the video cable. Because of the inherent divide by two of this configuration, the blanking level of the video cable is always less than 1V, which complies with industry-standard video requirements. The video buffer can also drive an AC-coupled video load. Good video performance is achieved with an output capacitor as low as 220F.
SO
Chip Information
TRANSISTOR COUNT: 4252 PROCESS: BiCMOS
Power-Supply Bypassing and Layout
The MAX7443/MAX7444 operate from a single +5V supply. Bypass VCC to GND with a 0.1F capacitor. Place all external components as close to the device as possible. Refer to the MAX7443 evaluation kit for a proven PC board layout example.
Exposed Pads
Both the SO and thin QFN packages of the MAX7443/ MAX7444 have exposed pads on the bottom of the packages. These pads are electrically connected to GND and should be connected to the ground plane for improved thermal conductivity. Do not route signals under these packages.
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7443/MAX7444
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.)
8L, SOIC EXP. PAD.EPS
6
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
Package Information (continued)
(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.) 6, 8, &10L, QFN THIN.EPS
PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
MAX7443/MAX7444
21-0137
C
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7443/MAX7444
Package Information (continued)
(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.)
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
0.25 MIN 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T833-1 T1033-1 N 6 8 10 D2 1.50-0.10 1.50-0.10 1.50-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.65 BSC 0.50 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEED-3 b 0.40-0.05 0.30-0.05 0.25-0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 2.00 REF
PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
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.
8 _____________________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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