The MAX7457 4-channel video switch 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/terrestrial set-top boxes (STBs), DVD players, hard disk recorders (HDRs), and personal video recorders (PVRs). The MAX7457 filters and buffers CVBS and RGB video signals, making it ideal for dual SCART (peritelevision) STBs with an auxiliary CVBS input. The MAX7457 operates from a single +5V supply and has a flat passband out to 5MHz with a stopband attenuation of 43dB at 27MHz, making it ideal for NTSC, PAL, and standard-definition digital TV (SDTV) video systems. The MAX7457 output buffers have a fixed gain of +6dB and are capable of driving two standard 150Ω video loads. The channel for CVBS video has high-frequency boost circuitry that enhances picture sharpness with up to +1.2dB of gain boost without degradation in the stopband. The video output drivers can be disabled by an external control input. The MAX7457 is available in a 16-pin, 5mm x 5mm x 0.8mm TQFN package, and is specified over the extended (-40°C to +85°C) temperature range.
The MAX7457 is a 4‑channel video switch designed for dual SCART applications such as set‑top boxes, DVD players, and digital VCRs. It filters and buffers CVBS and RGB signals, provides an auxiliary CVBS input, and operates from a single +5 V supply.
The device is offered in a 16‑pin, 5 mm × 5 mm × 0.8 mm TQFN package and is rated for -40 °C to +85 °C operation. Detailed electrical characteristics, pin descriptions, and layout recommendations are provided for designers.
| Supply Voltage Range | 4.75 V – 5.25 V |
|---|---|
| Passband Ripple | ±0.75 dB up to 5 MHz |
| Stopband Attenuation | 43 dB at 27 MHz (typ) |
| Output Buffer Gain | +6 dB |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 16‑pin TQFN, 5 mm × 5 mm × 0.8 mm |
| High‑Frequency Boost (CVBS channels) | +1.2 dB |
The device operates from a supply voltage of 4.75 V to 5.25 V.
Typical stopband attenuation is 43 dB at 27 MHz.