ADV7177
ObsoleteDigital CCIR-601 to PAL/NTSC Video Encoder with 3x9-Bit DACs
Overview
- ITU-R BT601/656 YCrCb to PAL/NTSC video encoder
- High quality, 9-bit video DACs
- Integral nonlinearity <1 LSB at 9 bits
- NTSC-M, PAL-M/N, PAL-B/D/G/H/I
- Single 27 MHz crystal/clock required (±2 oversampling)
- 75 dB video SNR
- 32-bit direct digital synthesizer for color subcarrier
- Multistandard video output support:
Composite (CVBS)
Component S-video (Y/C)
Component YUV or RGB
- Video input data port supports:
CCIR-656 4:2:2 8-bit parallel input format
4:2:2 16-bit parallel input format - Full video output drive or low signal drive capability
34.7 mA max into 37.5 Ω (doubly terminated 75 R)
5 mA min with external buffers - Programmable simultaneous composite and S-VHS (VHS) Y/C or RGB (SCART)/YUV video outputs
- Programmable luma filters (low-pass/notch/extended)
The ADV7177/ADV7178 is an integrated digital video encoder that converts Digital CCIR-601 4:2:2 8- or 16-bit component video data into a standard analog baseband television signal compatible with worldwide standards.
The 4:2:2 YUV video data is interpolated to two times the pixel rate. The color-difference components (UV) are quadrature modulated using a subcarrier frequency generated by an on-chip 32-bit digital synthesizer (also running at two times the pixel rate).
The two times pixel rate sampling allows for better signal-to-noise ratio. A 32-bit DDS with a 9-bit look-up table produces a superior subcarrier in terms of both frequency and phase. In addition to the composite output signal, there is the facility to output S-Video (Y/C) video, YUV or RGB video.
Documentation
Data Sheet 1
Application Note 1
Analog Dialogue 1
This is the most up-to-date revision of the Data Sheet.