Digital CCIR-601 to PAL/NTSC Video Encoder with 3x9-Bit DACs

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.

* 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