參數(shù)資料
型號(hào)： SAA7138
廠商： NXP Semiconductors N.V.
英文描述： The Digital Video Decoder/Encoder Modules(數(shù)字視頻譯碼器/編碼器模塊)
中文描述： 數(shù)字視頻解碼器/編碼器模塊（數(shù)字視頻譯碼器/編碼器模塊）
文件頁(yè)數(shù)： 7/53頁(yè)
文件大小： 456K
代理商： SAA7138
Module System: 7128MOD2
Philips Semiconductors
7
Application Note
AN 97085
1.
Introduction
The Digital Video Decoder/Encoder Modules provide the basis to evaluate various Philips Digital Video Decoders
and Encoders and give the opportunity to simply insert the modules into customized applications and systems.
On the following pages the assembly and function of a Digital Video Encoder Module is shown. The module can
operate in stand alone mode (colourbar generator) as well as extension to other systems like PCI-bridges, MPEG
decoders or Video input/output systems.
The module has a socket for an I2C-bus EEPROM (e.g. PCF8582, PCF8594, PCF8598, X24164) in order to
store data for initialization and for simple control functionality operated by a (future) microcontroller module.
Software for IBM compatible personal computers enables access to all features and settings of the devices. It
handles the I2C-bus via a printer port adaptor. This adaptor and a fitting cable is part of the accessory.
This modular concept was designed to combine different video decoders with various video encoders. Some
modules (e.g. the 7128MOD2) can be configured for several devices and packages without the necessity of
having a new PCB. This could be achieved by using multiple footprints for one IC and some configurational parts.
For interfacing a 96-pin module connector is used.
The modules need a 5V analog and a 5V digital supply voltage. A respective power connector is placed at each
backend (encoder-) module whereas frontend modules are supplied via the 96-pin module connector.
If necessary, an internal voltage regulator generates the required 3.3V onboard. Alternatively it is also possible to
bypass the regulators on some encoder modules and connect 3.3V supply directly to the respective pins. You
can find a fitting power connector cable as a part of the accessory as well.
2.
Digital Video Encoder Module 7128MOD2
The digital encoder module 7128MOD2 contains the Philips Digital Encoder SAA7128/29, SAA7138/39,
SAA7120/21or SAA7126/27 (the even-numbered types include Macrovision Pay-per-View copy protection, while
the odd-numbered types do not).
All listed encoders are CMOS 3.3V devices with 3.3V input stages but differ (among others) in following features:
SAA7128/29
PAL/NTSC/SECAM encoder with six DACs for CVBS(CSYNC), VBS(CVBS), C(CVBS), R(Cr),
G(Y), B(Cb) (signals in brackets optionally) and a 54MHz double speed multiplexed D1 interface. It features also
a versatile fader for fading of two data streams (at double speed port MP) against each other. QFP44 package.
SAA7138/39
PAL/NTSC/SECAM encoder with six DACs for CVBS(CSYNC), VBS(CVBS), C(CVBS), R(Cr),
G(Y), B(Cb) (signals in brackets optionally) and a 54MHz double speed multiplexed D1 interface. It features also
a versatile fader for fading of two data streams (at double speed port MP or through the additional port DP) against
each other. QFP64 package.
SAA7120/21
PAL/NTSC encoder with three DACs for CVBS, Y, C. QFP44 package.
SAA7126/27
PAL/NTSC encoder with four DACs for CVBS(CSYNC, VBS), R(Cr, C), G(Y, VBS) and B(Cb,
CVBS) (signals in brackets optionally) and a 54MHz double speed multiplexed D1 interface. QFP44 package.
The digital data is fed via the 96-pin input connector. The circuits accept CCIR compatible YUV data with 720
active pixels per line in 4:2:2 multiplexed formats, for example MPEG decoded data. For interfacing an ECL - TTL
converter can be used (accessory). At a 54MHz (double speed) multiplexed D1 input port the circuits accept two
CCIR compatible CbYCr data streams for example MPEG decoded data with overlay, whereas one datastream is
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