SAA7128A/29A
In February 2010, Trident acquired the set-top box and TV product lines from NXP’s BU Home. The products on this page are now a part of Trident Microsystems’ product offering for the television markets.
General Description
The SAA7128AH; SAA7129AH encodes digital CB -Y-CR video data to an NTSC, PAL or SECAM CVBS or S-video signal. Simultaneously, RGB or bypassed but interpolated CB -Y-CR signals are available via three additional DACs. Through a 54 MHz multiplexed digital D1 input port, the circuit accepts two ITU-R BT.656 compatible CB -Y-CR 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, the other one is latched at the falling clock edge.
It includes a sync/clock generator and on-chip DACs.
Key Features
- Monolithic CMOS 3.3 V device, 5 V I²C-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 (CR ), GREEN (Y) and BLUE (CB ) two times oversampled with 9-bit resolution (signals in brackets optional)
- Alternatively, an advanced composite sync is available on the CVBS output for RGB display centring
- Real-time control of subcarrier
- Cross-colour 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 I²C-bus
- Fast I²C-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 Colour Bar Generator (CBG)
- Macrovision™* Pay-per-View copy protection system rev. 7.01 and rev. 6.1 as option; this applies to SAA7128AH only. The device is protected by USA patent numbers 4631603, 4577216 and 4819098 and other intellectual property rights. Use of the Macrovision anti-copy process in the device is licensed for non-commercial home use only. Reverse engineering or disassembly is prohibited. Please contact your nearest Philips Semiconductors sales office for more information
- Controlled rise/fall times of output syncs and blanking
- On-chip crystal oscillator (3rd-harmonic or fundamental crystal)
- Down mode (low output voltage) or power-save mode of DACs
- QFP44 package.
* Macrovision™ is a trademark of the Macrovision Corporation.
Block Diagram
