SAA5700GP 查看數據表（PDF） - Philips Electronics

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SAA5700GP

Chinese Character System Teletext (CCST) decoder

Philips Electronics 

Philips Semiconductors

Chinese Character System Teletext

(CCST) decoder

Preliminary specification

SAA5700

FEATURES

• Acquisition and display of the 625-line PAL CCST

Chinese standard for teletext, with Chinese and Latin

character sets

• Supports multiple DRAM sizes: 256K × 4 bits,

1M × 4 bits, 4M × 4 bits and 2 × 1M × 4 bits with an

additional decoder/demultiplexer IC

• Acquires and stores in background up to (typically)

400 pages with 1M × 4 bits external DRAM

• CCST Fastext, with capability of displaying Chinese

characters on Fastext prompt row

• Meshing for reduced contrast video background in

subtitles and boxes

• Full line and screen colour to all edges of screen

• Supports 625-line 50/100 Hz display modes

• Scan-locked and stand-alone sync modes; supports

video-locked sync modes with external PLL

• Easy control via high level I2C-bus SAFARI commands

• Sync mode switching and picture centring via I2C-bus

SAFARI commands

• Supports external decryption unit for encrypted data.

GENERAL DESCRIPTION

The SAA5700 is a Chinese teletext decoder suitable for TV

and multimedia applications. It incorporates all the data

slicing, acquisition and display circuitry on-chip, as well as

the logic for memory management. An external DRAM is

used to store the currently displayed page and also the

precaptured teletext pages.

An external ROM is used to store the ideographic Chinese

character set. There is a high level software interface with

easy commands for the control of the decoder. Control is

achieved via the I2C-bus.

The device is available in a QFP64 package.

ORDERING INFORMATION

TYPE NUMBER

SAA5700GP

PACKAGE

NAME

DESCRIPTION

QFP64 plastic quad flat package; 64 leads (lead length 1.95 mm);

body 14 × 20 × 2.8 mm

VERSION

SOT319-2

1997 May 16

2

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