MAX7443 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs

19-2749; Rev 0; 1/03
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
General Description
The MAX7443/MAX7444 are low-cost, triple-channel
video reconstruction filters for S-video and CVBS video
signals. These devices are ideal for anti-aliasing and
DAC smoothing video applications such as set-top
boxes, DVD players, hard-disk recorders (HDRs), and
personal video recorders. These filters operate from a
single +5V supply. They are optimized for NTSC, PAL,
and standard-definition digital TV (SDTV) video systems.
Each channel consists of a lowpass filter and an
adjustable-gain output buffer capable of driving two
standard 150Ω video loads. The output buffers can drive
either an AC or a DC load such that the blanking level
voltage after the backmatch resistor is less than 1V. The
Y and C video inputs are summed to produce the com-
posite video output. The MAX7444 offers high-
frequency boost to improve picture sharpness. The
MAX7443 has a maximum flat-frequency response.
The MAX7443/MAX7444 are available in a tiny 8-pin thin
QFN and an 8-pin SO package with exposed pad, and
are fully specified over the -40°C to +85°C extended
temperature range.
Applications
Set-Top Boxes/HDR/DVD
Security Cameras/Digital
Cameras
Game Consoles
Digital VCRs
Every Composite,
S-Video Output for NTSC,
PAL, SDTV
Features
o Triple-Channel Filter and Buffer for CVBS and
Y/C (S-Video)
o Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals
o 41dB (typ) Stopband Attenuation at 27MHz
o -0.3dB (typ) Passband Response
o Low Blanking Level Voltage Allows DC-Coupled
Output
o Each Channel Drives Two 150Ω Video Loads
o +5V Single-Supply Voltage
o Tiny 8-Pin Thin QFN or 8-Pin SO Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7443ETA
MAX7443ESA
MAX7444ETA
MAX7444ESA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 Thin QFN-EP*
8 SO-EP*
8 Thin QFN-EP*
8 SO-EP*
*EP = Exposed pad.
Selector Guide appears at end of data sheet.
TOP
MARK
AFX
—
AFY
—
Functional Diagram
V_CC
*
ENCODER
*
YIN
LOWPASS
D/A
FILTER
6dB/
9.5dB/
12dB
YOUT
*
MAX7443
6dB/
Σ
9.5dB/
CVOUT
*
MAX7444
12dB
CIN
LOWPASS
D/A
FILTER
GND
6dB/
9.5dB/
12dB
COUT
GSET
*
*
*OPTIONAL
________________________________________________________________ Maxim Integrated Products 1
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