NJM2552 datasheet(7/21 Pages) NJRC

7 / 21 page

NJM2552

-7-

Ver.2007-10-24

TERMINAL FUNCTION (Ta=25°C , V

+=2.7V , circuit 1)

Pin No.

SYMBOL

EQUIVARENT CIRCUIT

VOLTAGE

FUNCTION

OSC (B)

2.66V

OSC (E)

1.95V

Oscillator Base /

Oscillator Emitter

Colpitts - type oscillator is formed

with an external oscillator element

of crystal unit or SAW resonator.

Output of an external oscillator

circuit can also input to pin1 or

pin2.

MIX OUT

1.75V

Mixer Output

An external 450kHz ceramic filter

is connected. The typical output

impedance is 1.8kΩ.

GND

Ground

AM IF IN

1.35V

AM IF Input

This is an AM IF signal input to

AGC amplifier. The typical input

impedance is 10kΩ.

AM DEC

1.35V

AM IF Decoupling

This is an AM IF decoupling

terminal for AGC amplifier.

An external decoupling capacitor

is connected to enhance stability.

FM IF IN

2.66V

IF Limiter Amplifier Input

This is an input to the IF amplifier

after passing through 450kHz

ceramic filter. The typical input

impedance is 1.8kΩ.

FM DEC

2.66V

IF Decoupling

An external decoupling capacitor

is connected to enhance stability.

22k

170u

V+

GND

200k

1.4k

135u

20p

V+

GND

10k

1.24V

25u

V+

GND

51k

0.9k 0.9k

80u

V+

GND

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