The MAX7449 is a 3-channel filter and buffer for RGB video signals. It has a fixed gain and can drive two standard 150 ohm video loads. The MAX7449 can be used as an ideal device for anti-aliasing and DAC smoothing video applications. It is also suitable for situations where analog video is reconstructed from a digital data stream, such as cable/satellite/terrestrial set-top boxes, DVD players, hard disk recorders (HDRs) and personal video recorders (PVRs).
The MAX7449 provides three independent channels that filter and buffer RGB video signals, offering a flat passband to 5 MHz and 43 dB stopband attenuation at 27 MHz. Each channel includes a low‑pass filter and a video buffer with a fixed +6 dB gain, capable of driving two 150 Ω video loads.
Designed for set‑top boxes, DVD players, digital VCRs and similar applications, the device operates from a 4.75‑5.25 V supply, uses a 14‑pin TSSOP‑EP package with an exposed pad, and includes pins for external sync and disable control. Recommended layout practices include proper power‑supply bypassing and grounding of the exposed pad for thermal performance.
| Supply Voltage Range | 4.75 V – 5.25 V |
|---|---|
| Passband Ripple | +0.75 dB (max) at 5 MHz |
| Stopband Attenuation | 43 dB (typ) at 27 MHz |
| Output Gain | +6 dB |
| Package Type | 14‑pin TSSOP‑EP |
It operates from a single +5 V supply with a voltage range of 4.75 V to 5.25 V.
The filter provides about 43 dB of stopband attenuation at 27 MHz.
The output buffers have a fixed gain of +6 dB.