Rainbow-electronics MAX7446 User Manual

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General Description
The MAX7446 4-channel, buffered video reconstruction
filter is ideal for anti-aliasing and DAC-smoothing video
applications or wherever analog video is reconstructed
from a digital data stream (such as cable/satellite/ter-
restrial set-top boxes, DVD players, hard disk recorders
(HDRs), and personal video recorders (PVRs)). This
device operates from a single +5V supply and has a
flat passband out to 5MHz with a stopband attenuation
of 43dB at 27MHz. This makes it ideal for use with
NTSC, PAL, and standard-definition digital TV (SDTV)
video systems. Each output is capable of driving two
standard 150 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
video drivers can be disabled with an external pin.
The MAX7446 is available in a 14-pin TSSOP package
with an exposed pad, and is specified over the -40°C to
+85°C extended temperature range.
Applications
Set-Top Boxes/HDRs Game Consoles
Desktop Video Editors DVD Players
Digital VCRs
Features
4-Channel Filter and Buffer for RGB and
CVBS Signals
Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Video Signals
43dB (typ) Stopband Attenuation at 27MHz
±0.75dB (max) Passband Ripple Out to 5MHz
Blanking Level Voltage on Cable <1V
Each Channel Drives Two 150 Video Loads
+5V Single-Supply Voltage
Small 14-Pin TSSOP Package
MAX7446
4-Channel Video Filter for RGB and CVBS Video
________________________________________________________________ Maxim Integrated Products 1
DISABLE
V
CC
GND
MAX7446
OUTA
*
*
OUTB
*
*
OUTC
*
*
OUTD
*
*
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
75
*OPTIONAL CAPACITORS
INA
0.1µF
0.1µF
0.1µF
0.1µF
INB
INC
IND
D/A
ENCODER
CVBS
R
G
(WITHOUT SYNC)
B
D/A
D/A
D/A
SYNC
DETECTOR
LOWPASS
FILTER
LOWPASS
FILTER
LOWPASS
FILTER
LOWPASS
FILTER
Functional Diagram
Ordering Information
19-2951; Rev 0; 8/03
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.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX7446EUD -40°C to +85°C 14 TSSOP-EP*
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Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX7446 4-channel, buffered video reconstructionfilter is ideal for anti-aliasing and DAC-smoothing videoapplications or wherev

Page 2 - ELECTRICAL CHARACTERISTICS

MAX74464-Channel Video Filter for RGB and CVBS Video2 _______________________________________________________________________________________ABSOLUTE

Page 3 - MAX7446 toc02

MAX74464-Channel Video Filter for RGB and CVBS Video_______________________________________________________________________________________ 3AMPLITUDE

Page 4 - Detailed Description

MAX74464-Channel Video Filter for RGB and CVBS Video4 _______________________________________________________________________________________Pin Descr

Page 5 - Chip Information

FilterFilter ResponseThe reconstruction filter consists of two 2nd-order Sallen-Key stages. The Butterworth-type response features amaximally flat pas

Page 6 - Package Information

MAX74464-Channel Video Filter for RGB and CVBS VideoMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied

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