Bidirectional Video Filters/Buffers for Composite and S-Video Portable Media Devices

The MAX7481/MAX7482 bidirectional video filters/buffers provide the reconstruction filter and line drive buffer for both composite (CVBS) and S-Video (Y/C) video signals in playback mode, and anti-aliasing in record mode for portable media devices. Each channel consists of a lowpass filter and an output buffer capable of driving a full 2VP-P video signal into one standard 150Ω load (DC-coupled to ground). In record mode, the MAX7481/MAX7482 output buffers have a gain of +6dB. In playback mode, the MAX7481 output buffers have a gain of +6dB and the MAX7482 output buffers have a gain of +7dB.

The MAX7481/MAX7482 feature DirectDrive™ by utilizing an internal negative charge pump and regulator to maintain the output blanking level at ground, eliminating the need for a negative supply voltage, a large output coupling capacitor, or a sag correction configuration.

The MAX7481/MAX7482 operate from a single +2.7V to +3.6V power supply. These devices are available in a space-saving 28-pin TQFN package and operate over the -40°C to +85°C extended temperature range.

Applications

* Digital Camcorders * Digital Cameras * Portable Media Devices

* Composite and S-Video, Video-Playback and Video-Record Interface for Portable Video Devices* Saves Space by Sharing Connectors in Portable Devices* DirectDrive

* Eliminates Expensive AC-Coupling Capacitors* Blanking Level at Ground with Single Supply

* Composite and Y/C Signals* Advanced Power-Down Modes for Extended Battery Life* Low Supply Current in Shutdown Mode, < 1µA (typ)* Filter Response Ideal for NTSC and PAL* +6dB (MAX7481) or +7dB (MAX7482) Gain* +2.7V to +3.6V Single-Supply Operation* Small, 28-Pin, TQFN Package (5mm x 5mm)