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 composite
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.
Key Features
Applications/Uses
Triple-Channel Filter and Buffer for CVBS and
Y/C (S-Video)
Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals
41dB (typ) Stopband Attenuation at 27MHz
-0.3dB (typ) Passband Response
Low Blanking Level Voltage Allows DC-Coupled
Output
Each Channel Drives Two 150Ω Video Loads
+5V Single-Supply Voltage
Tiny 8-Pin Thin QFN or 8-Pin SO Packages
Digital VCRs
Every Composite, S-Video Output for NTSC/PAL, SDTV
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