MAX7446 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 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.
Applications
Set-Top Boxes/HDRs
Game Consoles
Desktop Video Editors
DVD Players
Digital VCRs
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
PART
MAX7446EUD
*EP = Exposed pad.
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
14 TSSOP-EP*
Pin Configuration appears at end of data sheet.
Functional Diagram
ENCODER
CVBS D/A
0.1µF
INA
LOWPASS
FILTER
V_CC
SYNC
DETECTOR
75Ω
75Ω
*
OUTA
75Ω
75Ω
*
R D/A
0.1µF
INB
LOWPASS
FILTER
75Ω
75Ω
*
OUTB
75Ω
75Ω
*
G
(WITHOUT SYNC)
D/A
0.1µF
INC
LOWPASS
FILTER
75Ω
75Ω
*
OUTC
75Ω
75Ω
*
B D/A
0.1µF
IND
LOWPASS
FILTER
75Ω
75Ω
*
OUTD
75Ω
75Ω
*
MAX7446
GND
DISABLE
*OPTIONAL CAPACITORS
________________________________________________________________ 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.