SAA5254 データシートの表示（PDF） - Philips Electronics

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SAA5254

Integrated VIP and teletext decoder (IVT1.1X)

Philips Electronics 

Philips Semiconductors

Integrated VIP and teletext decoder

(IVT1.1X)

Preliminary specification

SAA5254

PINNING

SYMBOL

VDD1

OSCOUT

OSCIN

OSCGND

VSS1

REF+

BLACK

CVBS

IREF

VDD2

POL

STTV/LFB

VCR/FFB

VSS2

R

G

B

RGBREF

BLAN

VSS3

COR

ODD/EVEN

Y

SCL

SDA

i.c.

PIN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26 to 40

DESCRIPTION

+5 V supply 1

27 MHz crystal oscillator output

27 MHz crystal oscillator input

0 V crystal oscillator ground

0 V ground 1

Positive reference voltage for the ADC. This pin should be connected to +5 V.

Video black level storage pin, connected to ground via a 100 nF capacitor.

Composite video input pin. A positive-going 1 V (peak-to-peak) input is required,

connected via a 100 nF capacitor.

Reference current input pin, connected to ground via a 27 kΩ resistor.

+5 V supply 2

STTV/LFB/FFB polarity selection pin

Sync to TV output pin/line flyback input pin. Function controlled by an internal register bit

(scan sync mode).

PLL time constant switch/field flyback input pin. Function controlled by an internal register

bit (scan sync mode).

0 V ground 2

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.

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

Dot rate fast blanking output.

0 V ground 3

Programmable active LOW output to provide contrast reduction of the TV picture for mixed

text and picture displays or when viewing newsflash/subtitle pages; open drain output.

25 Hz output synchronized with the CVBS inputs field sync pulses to produce a

non-interlaced display by adjustment of the vertical deflection currents.

Dot rate character output of teletext foreground colour information; open drain output.

Serial clock input for the I2C-bus. It can still be driven during power-down of the device.

Serial input/output data port for the I2C-bus; open drain output. It can still be driven during

power-down of the device.

Internally connected. Must be left open-circuit in application.

1996 Nov 07

4

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