TA1231 データシートの表示（PDF） - Toshiba

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TA1231

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

Toshiba 

BLOCK DIAGRAM

TA1231F,TA1231FN

TERMINAL FUNCTION

PIN No.

PIN NAME

FUNCTION

1

16

VHF oscillator

2

3

4

UHF oscillator

5

VHF oscillator.

To prevent abnormal oscillation,

connect a resistor between pin 16 and

the external capacitor.

UHF oscillator.

Pin 5 uses both as band

switch.Connecting pin 5 to VCC via

22kΩ sets to UHF ; connecting pin 12

to GND sets to VHF.

To use VHF SW voltage OPEN rather

than GND, connect a resistor of

around 10kΩ. Changing capacitor of

6pF connected to pins 2 and 5 of test

circuit 2 varies the oscillation

frequency range.

Be careful not to set the constant too

large, because abnormal oscillation

may occur.

INTERFACE

2001-02-23 2/12

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