NJM2592 JRC, NJM2592 Datasheet - Page 5

• Manufacturer Part Number: NJM2592
• Description: FM IF Demodulator IC / SSOP20
• Manufacturer: JRC

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Ver.2004-08-25
Pin No.
TERMINAL FUNCTION (
1
2
3
4
5
6
7
FSK VREF1
SYMBOL
MIX OUT
OSC (B)
OSC (E)
IF IN
DEC
V+
Ta=25°C, V
1
2
6
7
3
5
EQUIVARENT CIRCUIT
1.4k
1k
+
=2.0V
1k
50k
)
20p
V+
V+
V+
V+
VOLTAGE
1.94V
1.94V
0.55V
1.1V
-
-
-
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.
Mixer Output
An external 455kHz ceramic filter is
connected. The typical output
impedance is 2kΩ.
Supply Voltage
IF Limiter Amplifier Input
This is an input to the IF amplifier
after passing through 455kHz
ceramic filter. The typical input
impedance is 2kΩ.
IF Decoupling
An external decoupling capacitor
is connected to enhance stability.
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.
FUNCTION
NJM2592
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