The MAX7448 is a 4-channel buffered video reconstruction filter, ideal for anti-aliasing and digital-to-analog converter (DAC)-smoothing video applications or wherever 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)). This device operates from a single +5V supply and has a flat passband out to 5MHz with a stopband attenuation of 43dB at 27MHz. This makes it ideal for use with NTSC, PAL, and standard-definition digital TV (SDTV) video systems. Each output is capable of driving two standard 150Ω video loads. The MAX7448 processes RGB and asynchronous CVBS video signals. The output video buffers have a fixed gain of +6dB. The channel used for CVBS video has high-frequency boost circuitry, which provides picture sharpness with +1.2dB of gain boost without degradation in the stopband. The output video drivers can be disabled with an external pin. The MAX7448 is available in a 14-pin TSSOP package with an exposed pad, and is specified over the -40°C to +85°C extended temperature range.
The MAX7448 4‑channel video filter and buffer processes RGB and asynchronous CVBS signals for applications such as set‑top boxes, DVD players, digital VCRs and other SDTV systems. It operates from a single +5 V supply, provides a flat passband to 5 MHz, and offers a typical 43 dB stopband attenuation at 27 MHz, making it suitable for NTSC, PAL and other standard‑definition video formats.
Key features include a fixed +6 dB gain per channel, the ability to drive two 150 Ω video loads per channel, high‑frequency boost on the CVBS channel, and an exposed‑pad 14‑pin TSSOP‑EP package that supports operation from –40 °C to +85 °C. The device also provides disable logic, output clamp control, and recommended layout guidelines for optimal performance.
| Supply Voltage | +5 V single‑supply |
|---|---|
| Passband Frequency | Flat to 5 MHz |
| Stopband Attenuation | 43 dB at 27 MHz (typ) |
| Operating Temperature Range | -40 °C to +85 °C |
| Number of Channels | 4 |
| Input Coupling Capacitor | 0.1 pF (per channel) |
The device operates from a single +5 V supply.
The typical stopband attenuation is 43 dB at 27 MHz.