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AN5637

SECAM decoder IC

Panasonic Corporation 

AN5637

ICs for TV

s Terminal Equivalent Circuits

Pin No.

Equivalent circuit

1

VCC

150µA 100µA 200µA

To AN5192/95

200Ω

1

SECAM

/Non-SECAM

discrimination

1.5kΩ 1.5kΩ

Mode

changeover

3.7V

20kΩ

0/175µA

0/175µA

2

VCC

Description

Reference frequency signal/

Ident input Pin :

• Input and output pin for interfacing

with AN5192/95.

• The circuit becomes non-SECAM mode

if DC voltage of Pin1 becomes 3 V

or less.

• Current of 175 µA sinks into Pin1

in SECAM.

Voltage

AC + DC

DC

1.1 V or 4.4 V

AC

350 mV[p-p]

or 0

Bell filter output monitor pin

AC + DC

2

200Ω

DC

4.3 V

200µA 200µA

AC

200 mV[p-p]

3



Power supply pin

DC : 9 V

4

VCC

Black level adjustment voltage input pin :

DC

• Monitoring −(B−Y) Out (Pin10), 1.45 V to 2.75 V

adjust Pin4 voltage so that pedestal

step difference becomes 0.

(using external volume)

5

6.8kΩ

10kΩ

15kΩ

4

0.01µF

Black level

adjustment

100µA 200µA

• Pin4 voltage is generated by resistor

dividing Pin5 voltage so as not to be

affected by VCC and temperature

fluctuation.

5

VCC

Black level adjustment reference voltage

output pin

DC : 3.2V

3.2V

5

100µA 100µA 400µA

8

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