Rainbow Electronics MAX7446 - Manual

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
Ω 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 150Ω 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 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
75 Ω
*OPTIONAL CAPACITORS
INA
0.1 µF
0.1 µF
0.1 µF
0.1 µF
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*