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SAA5281

Integrated Video input processor and Teletext decoder (IVT1.8*)

Philips Electronics 

Philips Semiconductors

Integrated Video input processor and

Teletext decoder (IVT1.8*)

Preliminary specification

SAA5281

FEATURES

• Complete Teletext and VPS decoding in a single

package

• Built-in 8K × 8 memory for up to 8 page storage

• Enhanced mode allows 7 Fastext pages and 8 pages of

TOP to be captured

• Ability to request only subtitle pages

• Acquisition and decoding of VPS data

• Data valid output available to indicate reception of

error-free VPS or packet 8/30/2 data

• Software and hardware compatible with SAA5246 and

SAA5248

• Meshing display within boxes

• Separate data checking algorithms and pointers for

each acquisition channel

• 24 : 18 Hamming checker

• Automatic packet 26 extension character processing

• Indication of Line 23 for external use

• 13.5 MHz clock output to drive external microcontroller

• Detection of Spanish transmissions to disable

flicker-stopper

• Compatible with Philips’ one-chip TV IC (TDA836X) for

scan-locking applications.

DESCRIPTION

The IVT1.8* is a single-chip Teletext decoder IC for

decoding 625-line based World System Teletext

transmissions. The device is based on IVT1.0VPS and has

reception facilities for the 5 MHz biphase VPS signal. It is

intended for use in video recorders, in particular to

implement the VPT facility (VCR programming via

Teletext). With suitable software both VPT standards

(EBU PDC System A and System B) can be

accommodated to allow operation from any European VPT

transmission. Automatic processing of packet 26

transmissions is also possible. No external memory is

required as an 8K × 8 DRAM is included on-chip for up to

8 page storage. An enhanced mode allows 7 Fastext

pages to be stored, with one chapter used to store

extension packets.

QUICK REFERENCE DATA

SYMBOL

VDD

IDD

Vsync

Vvid(p-p)

fxtal

Tamb

PARAMETER

supply voltage

supply current

sync voltage amplitude

video input voltage amplitude

(peak-to-peak value)

crystal frequency

operating ambient temperature

MIN.

4.5

−

0.1

0.7

TYP.

5.0

75

0.3

1.0

MAX.

5.5

150

0.6

1.4

UNIT

V

mA

V

V

−

27

−20

−

−

MHz

+70

°C

ORDERING INFORMATION

TYPE NUMBER

SAA5281P

SAA5281ZP

SAA5281GP

NAME

DIP48

SDIP52

QFP64

PACKAGE

DESCRIPTION

plastic shrink dual in-line package; 32 leads (400 mil)

plastic shrink dual in-line package; 52 leads (600 mil)

plastic quad flat package; 64 leads

(lead length 1.95 mm); body 14 × 20 × 2.8 mm

VERSION

SOT240-1

SOT247-1

SOT319-2

1996 Nov 04

2

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