NJM2593 datasheet(6/16 Pages) NJRC

6 / 16 page

NJM2593

Ver.2004-08-25

- 6 -

TERMINAL FUNCTION (Ta=25°C, V

+=2.0V)

Pin No.

SYMBOL

EQUIVARENT CIRCUIT

VOLTAGE

FUNCTION

OSC (B)

1.98V

OSC (E)

1.28V

Base / Emitter Terminal

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

1.18V

Mixer Output

An external 455kHz ceramic filter is

connected. The typical output

impedance is 2kΩ.

V+

Supply Voltage

IF IN

1.96V

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.

DEC

1.96V

IF Decoupling

An external decoupling capacitor

is connected to enhance stability.

FSK VREF1

0.46V

FSK Reference Input

This pin is an input of reference

voltage for FSK comparator. An

external capacitor is connected to

create an average DC level of FM

demodulated signal. The choice of

this capacitor is dependent on the

speed of data signal.

A quick charge/discharge circuit

offers the voltage of pin 7 comes

the same voltage of pin 11 quickly.

V+

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