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MAX7446

Description
4-Channel Video Filter for RGB and CVBS Video
File Size194KB,6 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX7446 Overview

4-Channel Video Filter for RGB and CVBS Video

19-2951; Rev 0; 8/03
4-Channel Video Filter for RGB and CVBS Video
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 150Ω 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.
Features
o
4-Channel Filter and Buffer for RGB and
CVBS Signals
o
Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Video Signals
o
43dB (typ) Stopband Attenuation at 27MHz
o
±0.75dB (max) Passband Ripple Out to 5MHz
o
Blanking Level Voltage on Cable <1V
o
Each Channel Drives Two 150Ω Video Loads
o
+5V Single-Supply Voltage
o
Small 14-Pin TSSOP Package
MAX7446
Ordering Information
PART
MAX7446EUD
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
14 TSSOP-EP*
Applications
Set-Top Boxes/HDRs
Desktop Video Editors
Digital VCRs
Game Consoles
DVD Players
*EP
= Exposed pad.
Pin Configuration appears at end of data sheet.
Functional Diagram
V
CC
ENCODER
75Ω
0.1µF
CVBS
D/A
*
INA
LOWPASS
FILTER
SYNC
DETECTOR
OUTA
75Ω
75Ω
0.1µF
R
D/A
*
INB
LOWPASS
FILTER
OUTB
75Ω
75Ω
0.1µF
G
(WITHOUT SYNC)
D/A
INC
LOWPASS
FILTER
OUTC
75Ω
*
*
*
*
*
75Ω
75Ω
75Ω
*
75Ω
75Ω
75Ω
0.1µF
B
D/A
IND
LOWPASS
FILTER
OUTD
75Ω
75Ω
75Ω
75Ω
*OPTIONAL CAPACITORS
MAX7446
GND
DISABLE
________________________________________________________________
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.
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