SAA5281ZP datasheet(4/48 Pages) PHILIPS

4 / 48 page

1996 Nov 04

Philips Semiconductors

Preliminary speciﬁcation

Integrated Video input processor and

Teletext decoder (IVT1.8*)

SAA5281

PINNING

SYMBOL

DESCRIPTION

SOT240-1 SOT247-1 SOT319-2

VDD1

+5 V supply 1

OSCOUT

27 MHz crystal oscillator output

OSCIN

27 MHz crystal oscillator input

OSCGND

0 V crystal oscillator ground

VSS1

4 and 5

0 V ground

REF+

positive reference voltage for ADC; this pin should be connected

to ground via a 100 nF capacitor

BLACK

video black level storage input/output; this pin should be

connected to ground via a 100 nF capacitor

CVBS

composite video input; a positive-going 1 V (peak-to-peak) input

is required, connected via a 100 nF capacitor

IREF

reference current input, connected to ground via a 27 k

Ω resistor

VDD2

+5 V supply 2

POL

STTV/LFB/FFB polarity selection input

STTV/LFB

sync to TV output line ﬂyback input; function controlled by an

internal register bit (scan sync mode)

VCR/FFB

PLL time constant switch/ﬁeld input; function controlled by an

internal register bit (scan sync mode)

VSS2

0 V ground; connected to VSS1 for normal operation

dot rate character output of the RED colour information

dot rate character output of the GREEN colour information

dot rate character output of the BLUE colour information

RGBREF

input DC voltage to deﬁne the output high level on the RGB pins

BLAN

dot rate fast blanking output

COR

programmable output to provide contrast reduction of the TV

picture for mixed text and picture displays or when viewing

newsﬂash/subtitle pages;

open-drain output

ODD/EVEN

(or DV)

in ODD/EVEN mode a 25 Hz output synchronized with the CVBS

input ﬁeld sync pulses to produce a non-interlaced display by

adjustment of the vertical deﬂection currents; in DV mode a VPT

data valid signal is used to indicate reception of error-free VPS or

8/30 format 2 data

dot rate character output of teletext foreground colour information;

open-drain output

SCL

serial clock input for I2C-bus; it can still be driven HIGH during

power-down of the device

SDA

serial data port for the I2C-bus, open-drain output; it can still be

driven HIGH during power-down of the device

VSS3

0 V ground

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