NJM2232A 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJM2232A

FM IF WITH LOG AMPLIFIER

Japan Radio Corporation  

NJM2232A

■ TERMINAL EXPLANATION

(1) Supply Voltage

The supply voltage is to be delivered at each block, such as limitter

Amplifier block ((1), (12) pin), Mixer bolck (23) pin, FM Discrimination

block (14) pin and so on. When applying the voltage, proceed it

supplying from the latter bolck to front in order of the block structure.

When the mixer block and FM block are not required the IC is not

operation, no functioning as long as the power supply is off.

(2) Mixer Input

Mixer input impedance (20) pin is designed to be set at 1.5kΩ

(standard) on voltage. It is advisable to input after DC cutting for

desired matched circuit.

(3) Oscillator

As far as the local oscillator ionput goes, there are 2 methods as

shown below.

1. Input after setting the crystal oscillating circuit, on (21), (22) pins.

2. Connect (21) pin directly on supply voltage, and then input the

external local oscillator output directly to pin 22.

(4) Filter (to be used between Mixer and Limitter Amp.)

Mixer output impedance (24) pin is 2kΩ (standard), Limitter Amp.

Impedance (2) pin is 18kΩ (standard) are desired.

Input harmonizing to the filter to be used for adequate matched

circuit.

(5) Limitter Amp. Input

Limitter amp. impedance is designed to be 18kΩ (standard). Be sure

to input after DC cutting.

(6) Decoupling Capacitance

(4), (5), (9) pins capacitor are AC decoupling capacitor, Which are set

as a part of amplifier feed back circuit of Limmitter amp. block. Please

apply about 0.1µF capacitance.

(7) Reference Capacitor

(6), (8), (18) pins capacitor are AC decoupling capacitor which are to

be connected to the internal reference. Please apply 0.1µF

capacitance.

NJM2232A

‹Supply Voltage›

‹Oscillator›

‹Limitter Amp. Input›

‹Decoupling Capacitor›

-4-

Ver.2003-12-09

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