AN5195K Ver la hoja de datos (PDF) - Panasonic Corporation

Número de pieza

componentes Descripción

Fabricante

AN5195K

Single chip IC for PAL/NTSC color TV (built-in I2C bus interface)

Panasonic Corporation 

ICs for TV

AN5195K-C

s Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

5

VCC for microcomputer

(5 V)

33 kΩ

175 Ω

To

5

microcomputer

Floating

resistor

0.47 µF

On

40 µA

10 kΩ

Off

Description

Killer, 50 Hz/60 Hz and SECAM det.

output pin:

• Output selecting by SW (I2C bus)

• Connect 33 kΩ load resistor of

pin 5 to microcomputer VCC

DC (V)

DC

low-level

0.2 V

high-level

5V

6

Pin for APC filter:

DC

• Filter pin for APC detection circuit approx. 2.5 V

5V

(VCC3)

(operates for BGP period)

• Detection sensitivity becomes large

APC

det.

circuit

3.3 V

1V

0.047 µF

6

40

kΩ

SW 2.2 µF

R

2.5 V 7.5 kΩ

when external R → large (Tends to

pull-in easily. Tends to be affected

by noise)

β curve

BGP

max. 1 mA

VCO

circuit

270 Ω

fC

V6

• At SECAM, APC circuit is stopped

by short circuiting 40 kΩ

resistor

7

Pin 7: Chroma oscillation pin (4.43 MHz):

AC

8

Pin 8: Chroma oscillation pin (3.58 MHz):

f = fC

• Oscillation pin for chroma. Either approx. 0.7 V[p-p]

IP2

IP1

DC

2.7 V

7

4.43

MHz

C7

12 pF

one of 4.43 MHz or 3.58 MHz is

oscillated

• Oscillation frequency changeover is

performed by 08−D7 bit of I2C bus

• At 08−D7= 0

100 µA 500 µA

DC

2.7V

8

3.58

MHz

IP1 and IP2 turn-on and at 4.43 MHz,

oscillation starts

IN2

100 µA100 µA

IN1

500 µA

C8

15 pF

At 08−D7=1

IN1 and IN2 turn-on and at 3.58

MHz, oscillation starts

• Pattern design of pin and oscillator

element should be as short as possi-

ble.

15

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