March 1991

2

Philips Semiconductors

Preliminary specification

Teletext video processor

SAA5191

FEATURES

• Adaptive data slicer

• Crystal-controlled data clock regeneration with a bit rate

of 6.9375 MHz

• Adaptive sync separator, horizontal phase detector and

13.5 MHz VCO to provide display phase locked loop

(PLL)

• TV synchronization at teletext mode

GENERAL DESCRIPTION

The SAA5191 is a bipolar integrated circuit that extracts

teletext data from the video signal (CVBS), regenerates

the teletext clock (TTC) and synchronizes the text display

to the television signals (VCS). This device operates in

conjunction with the Digital Video Teletext (back-end)

Decoder (DVTB - SAA9042A) or any other compatible

device.

QUICK REFERENCE DATA

ORDERING AND PACKAGE INFORMATION

Note

1. SOT117-1;1996 November 14

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

supply voltage (pin 16)

−

12

−

V

supply current

−

70

−

mA

CVBS input signal on pin 27 (peak-to-peak value)

at pin 2 LOW

−

1

−

V

at pin 2 open-circuit

−

2.5

−

V

outputs signals TTC and TTD

(peak-to-peak value, pins 14, 15)

2.5

3.5

4.5

V

13.5 MHz clock output signal

(peak-to-peak value pin 17)

12

3

V

video sync output signal (peak-to-peak value, pin 1)

−−

1V

SYNC output signal TCS

200

450

650

mV

VCS

video composite sync level on output pin 25

LOW

−−

0.4

V

HIGH

2.4

−

5.5

V

operating ambient temperature

0

−+70

°C

EXTENDED TYPE

NUMBER

PACKAGE

PINS

PIN POSITION

MATERIAL

CODE

SAA5191

28

DIL

plastic