The CX25824 four-channel video decoder was designed for surveillance applications. The CX25824 contains four high-quality NTSC/PAL video decoders, five audio ADCs, and one audio DAC.

The video decoders are designed with 10-bit ADCs and 5-line comb filtering for optimal luma-chroma separation to generate the highest-quality digital video output with the lowest possible noise and cross-luma/cross-chroma artifacts. They are also designed to lock to low-level inputs, as well as line locked cameras, both of which are common in video surveillance systems. Each video decoder includes a scaler for down-scaling the video, both horizontally and vertically, and controls for adjusting brightness, contrast, hue, saturation, and sharpness.

CX25824 Features

♦ Four High-Quality NTSC/PAL video decoders:

   – Anti-aliasing filters

   – 10-bit ADCs

   – 5-line comb filtering

   – Independent scaling

   – Brightness/Contrast/Hue/Saturation/Sharpness controls

   – Excellent low level-signal locking

♦ Audio Codec

   – 5 ADCs (4 ADCs for each camera input and one pair audio codec for two-way communication function)

   – 1 DAC

   – Support for 8/16/32/44.1/48k Hz sample rates

   – 4 I2S interfaces for record, mix, cascade, and playback

   – Support interleaved I2S/DSP style output

   – A-law/u-law encoding

   – 8/16/24 bit PCM audio data

♦ Flexible digital video output formats

   – ITU-R BT.656

   – Byte-interleaved of multiple sources at 27/54/108 MHz

♦ Programmable Motion Detection

♦ I2C interface

♦ The CX25824 is packaged in a 128-pin eTQFP package.

Applications

♦ Video Surveillance