MAX7447 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 4-Channel S-Video, CVBS Video Filter with Asynchronous CVBS Input

19-2950; Rev 0; 8/03
4-Channel S-Video, CVBS Video Filter with
Asynchronous CVBS Input
General Description
The MAX7447 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 MAX7447 processes S-Video and CVBS video sig-
nals. The video output buffers have a fixed gain of +6dB.
Each channel has high-frequency boost circuitry that pro-
vides picture sharpness with up to +1.2dB of gain boost
without degradation in the stopband. The output video
drivers can be disabled with an external pin.
The MAX7447 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
o 4-Channel Filter and Buffer for S-Video 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 Output <1V
o Each Channel Drives Two 150Ω Video Loads
o +5V Single-Supply Voltage
o Small 14-Pin TSSOP Package
PART
MAX7447EUD
*EP = Exposed pad.
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
14 TSSOP-EP*
Functional Diagram
ENCODER
CVBS D/A
0.1µF
INA
LOWPASS
FILTER
V_CC
SYNC
DETECTOR
75Ω
75Ω
*
OUTA
75Ω
75Ω
*
Y D/A
0.1µF
INB
LOWPASS
FILTER
75Ω
75Ω
*
OUTB
75Ω
75Ω
*
C D/A
0.1µF
INC
LOWPASS
FILTER
75Ω
75Ω
*
OUTC
75Ω
75Ω
*
CVBS D/A
0.1µF
IND
LOWPASS
FILTER
SYNC
DETECTOR
75Ω
75Ω
*
OUTD
75Ω
75Ω
*
MAX7447
GND
DISABLE
*OPTIONAL CAPACITORS
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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