NJM2550 View Datasheet(PDF) - Japan Radio Corporation
Part Name
Description
Manufacturer
NJM2550 Datasheet PDF : 15 Pages
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NJM2550
Pin No. SYMBOL
EQUIVARENT CIRCUIT
20uA
12
COMP IN
12
VOLTAGE
FUNCTION
Comparator Input
This pin is an input of the wave
shaping comparator.
--
20uA
13
COMP REF
13
20uA
GND
V+
GND
14
14 COMP OUT
GND
15
CHARGE
SWITCH
300k
15
V+
10uA
GND
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.
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.
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.
Ver.2006-02-24
-7-
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