The MAX7447 is a four-channel buffered video reconstruction filter from Texas Instruments that is ideal for anti-aliasing and DAC-smoothing video applications. It is also ideal for use with NTSC, PAL, and standard-definition digital TV (SDTV) video systems. Each output can drive two standard 150Ω video loads.
The MAX7447 is a 4‑channel, buffered video reconstruction filter designed for anti‑aliasing and DAC‑smoothing in set‑top boxes, DVD players, hard‑disk recorders and other SDTV applications. It operates from a single +5 V supply, provides a flat passband to 5 MHz, and delivers a typical stopband attenuation of 43 dB at 27 MHz. Each channel can drive two standard 150 Ω video loads and includes a +1.2 dB high‑frequency boost for improved picture sharpness.
The device is offered in a 14‑pin TSSOP‑EP package with an exposed pad for optimal thermal performance. Pin functions include four video inputs (INA‑IND), a disable logic input, and four video outputs (OUTA‑OUTD) that can be AC‑ or DC‑coupled. Recommended external components include 0.1 pF input coupling capacitors and a 75 Ω series resistor on each output.
| Passband Ripple | +0.75 dB (max) |
|---|---|
| Stopband Attenuation | 43 dB (typ) at 27 MHz |
| Supply Voltage | 4.75‑5.25 V (single‑supply) |
| Output Load Capability | Drives two 150 Ω video loads per channel |
| High‑Frequency Boost | +1.2 dB gain boost |
| Video Buffer Gain | +6 dB (fixed) |
The MAX7447 operates from a single +5 V supply.
Each channel can drive two standard 150 Ω video loads.
The device provides about 43 dB of stopband attenuation at 27 MHz.
It is available in a 14‑pin TSSOP‑EP package with an exposed pad.