4

5-Line Adaptive

C om b F ilter

C hrom a Path

Lum a Path

Scaler

Output

Form atter

VD EC A

M otion D etection

D igita l V ideo I/O

Mo d u le

C onfigurable BT.656 1/2/4/8 C h

@ 27, 54, or 108 M H z

VID_A_D AT [7:0]

VID_B_D AT [7:0]

VIN1

5-Line Adaptive

C om b F ilter

C hrom a Path

Lum a Path

Scaler

Output

Form atter

VD EC D

M otion D etection

VIN4

AIN 1-5

A udio P rocesso r

I2S/D SP D igital I/O , 8/16/24 bit @ 8, 16, 32, 44.1, or 48 kH z

R ecord/M ix audio outputs

Playback /C ascaded audio inputs

Record I2S

Mix Out

Playback I 2S

Cascade_IN/OUT

AOU T

ADC

ADC

ADC

DAC

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.

The CX25824 supports the standard

ITU-R BT.656 digital video format and

byte- multiplexed output at 27 MHz,

54 MHz, and 108 MHz. In addition,

each video decoder includes a motion

detection and image analytical engine.

With adjustable luma thresholds,

adjustable temporal sensitivity, and

block masks, this feature can be

utilized to notify host controllers to start

recording or wake from sleep during

detected events.

The CX25824 includes an audio codec

with five ADCs and one DAC for audio

playback or two-way communication

applications. The CX25824 was

designed with maximum flexibility in

mind, providing bi-directional bridging

of video and audio data, as well as

generic connectivity through GPIO and

CX25824

4-Channel Video/Audio Decoder with Integrated Audio DAC

Applications

Video Surveillance

Part Number CX25824

Description CX25824 4-Channel

Video/Audio Decoder with Integrated

Audio DAC