NJM2550 datasheet(7/15 Pages) NJRC

7 / 15 page

NJM2550

Ver.2006-02-24

-7-

Pin No.

SYMBOL

EQUIVARENT CIRCUIT

VOLTAGE

FUNCTION

COMP IN

Comparator Input

This pin is an input of the wave

shaping comparator.

COMP REF

Comparator Reference Input

This pin is an input of reference

voltage for the wave shaping

comparator. A capacitor is

connected to create an average

DC Level of FM demodulated

signal. The value of this capacitor

is dependant on the speed of data

signal. A quick charge /discharge

circuit offers the voltage of pin13

comes the average DC Level of

FM demodulated signal very

quickly.

COMP OUT

Comparator Output

An open-collector output.

The comparator is non-reverse

type. When the frequency of IF

input signal is fif +

∆, the output is

“Low”. When the frequency of IF

input signal is fif -

∆, the output is

“High”.

Instead of V+, another power

source can be used within the limit

of the rated supply voltage.

CHARGE

SWITCH

Quick

Charge

Discharge

Circuit ON / OFF Control

The quick charge/discharge circuit

is in the active stage when pin15

is pulled up to V+. This circuit is in

the stand-by stage when pin15 is

pulled down to GND. Instead of

V+, another power source can be

used within the limit of the rated

power supply voltage.

GND

20uA

V+

GND

V+

GND

10uA

300k

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