ADV7181CBSTZ datasheet(12/20 Pages) AD

12 / 20 page

ADV7181C

Data Sheet

Rev. E | Page 12 of 20

DETAILED FUNCTIONALITY

ANALOG FRONT END

The analog front-end section contains four high quality 10-bit

ADCs, and the six analog input channel mux enables multisource

connection without the requirement of an external mux. It also

contains

•

Four current and voltage clamp control loops to ensure

that any dc offsets are removed from the video signal

•

SCART functionality and SD RGB overlay on CVBS that

are controlled by fast blank input

•

Four internal antialias filters to remove out-of-band noise

on standard definition input video signals

SDP PIXEL DATA OUTPUT MODES

The SDP pixel data output modes are the following:

•

8-/10-bit ITU-R BT.656 4:2:2 YCrCb with embedded time

codes and/or HS, VS, and FIELD

•

16-/20-bit YCrCb with embedded time codes and/or HS,

VS, and FIELD

CP PIXEL DATA OUTPUT MODES

CP pixel data output modes include single data rate (SDR) and

double data rate (DDR) as follows:

•

SDR 8-/10-bit 4:2:2 YCrCb for 525i, 625i

•

SDR 16-/20-bit 4:2:2 YCrCb for all standards

•

DDR 8-/10-bit 4:2:2 YCrCb for all standards

•

DDR 12-bit 4:4:4 RGB for graphics inputs

COMPOSITE AND S-VIDEO PROCESSING

Composite and S-Video processing features offer support for

NTSC M/J, NTSC 4.43, PAL B/D/I/G/H, PAL60, PAL M, PAL N,

and SECAM (B, D, G, K, and L) standards in the form of CVBS

and S-Video as well as super-adaptive, 2D, 5-line comb filters

for NTSC and PAL give superior chrominance and luminance

separation for composite video. They also include full automatic

detection and autoswitching of all worldwide standards (PAL,

NTSC, and SECAM) and automatic gain control with white

peak mode to ensure the video is always processed without loss

of the video processing range. Other features are

•

Adaptive Digital Line Length Tracking (ADLLT™)

•

Proprietary architecture for locking to weak, noisy, and

unstable sources from VCRs and tuners

•

IF filter block to compensate for high frequency luma

attenuation due to tuner SAW filter

•

Chroma transient improvement (CTI)

•

Luminance digital noise reduction (DNR)

•

Color controls including hue, brightness, saturation,

contrast, and Cr and Cb offset controls

•

Certified Macrovision® copy protection detection on

composite and S-Video for all worldwide formats

(PAL/NTSC/SECAM)

•

4× oversampling (54 MHz) for CVBS, S-Video, and

YUV modes

•

Line-locked clock output (LLC)

•

Letterbox detection support

•

Free-run output mode to provide stable timing when no

video input is present

•

Vertical blanking interval data processor, including teletext,

video programming system (VPS), vertical interval time

codes (VITC), closed captioning (CC) and extended data

service (EDS), wide screen signaling (WSS), copy generation

management system (CGMS), and compatibility with

GemStar™ 1×/2× electronic program guide

•

Clocked from a single 28.63636 MHz crystal

•

Subcarrier frequency lock (SFL) output for downstream

video encoder

•

Differential gain typically 0.5%

•

Differential phase typically 0.5°

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