1. General description
The SAA7128H; SAA7129H encodes digital C
R
-Y-C
B
video data to an NTSC, PAL or
SECAM CVBS or S-video signal. Simultaneously, RGB or bypassed but interpolated
C
R
-Y-C
B
signals are available via three additional DACs. The circuit at a 54 MHz
multiplexed digital D1 input port accepts two
ITU-R BT.656
compatible C
R
-Y-C
B
data
streams with 720 active pixels per line in 4:2:2multiplexed formats, for example MPEG
decoded data with overlay and MPEG decoded data without overlay, where one data
stream is latched at the rising clock edge and the other at the falling clock edge.
It includes a sync/clock generator and on-chip DACs.
2. Features
■ Monolithic CMOS 3.3 V device, 5 V I
2
C-bus optional
■ Digital PAL/NTSC/SECAM encoder
■ System pixel frequency 13.5 MHz
■ 54 MHz double-speed multiplexed D1 interface capable of splitting data into two
separate channels (encoded and baseband)
■ Three Digital-to-Analog Converters (DACs) for CVBS (CSYNC), VBS (CVBS) and C
(CVBS) two times oversampled with 10-bit resolution (signals in brackets optional)
■ Three DACs for RED (C
R
), GREEN (Y) and BLUE (C
B
) two times oversampled with
9-bit resolution (signals in brackets optional)
■ An advanced composite sync is available on the CVBS output for RGB display
centering
■ Real-time control of subcarrier
■ Cross-color reduction filter
■ Closed captioning encoding and World Standard Teletext (WST) and North-American
Broadcast Text System (NABTS) teletext encoding including sequencer and filter
■ Copy Generation Management System (CGMS) encoding (CGMS described by
standard CPR-1204 of EIAJ); 20 bits in lines 20/283 (NTSC) can be loaded via I
2
C-bus
■ Fast I
2
C-bus control port (400 kHz)
■ Line 23 Wide Screen Signalling (WSS) encoding
■ Video Programming System (VPS) data encoding in line 16 (50/625 lines counting)
■ Encoder can be master or slave
■ Programmable horizontal and vertical input synchronization phase
■ Programmable horizontal sync output phase
■ Internal Color Bar Generator (CBG)
SAA7128H; SAA7129H
Digital video encoder
Rev. 03 — 9 December 2004 Product data sheet
