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NJM2593V Datasheet(PDF) 6 Page - New Japan Radio

Part # NJM2593V
Description  50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.jrc.co.jp/eng/index.html
Logo NJRC - New Japan Radio

NJM2593V Datasheet(HTML) 6 Page - New Japan Radio

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NJM2593
Ver.2004-08-25
- 6 -
TERMINAL FUNCTION (Ta=25°C, V
+=2.0V)
Pin No.
SYMBOL
EQUIVARENT CIRCUIT
VOLTAGE
FUNCTION
1
OSC (B)
1.98V
2
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.
3
MIX OUT
1.18V
Mixer Output
An external 455kHz ceramic filter is
connected. The typical output
impedance is 2kΩ.
4
V+
-
-
Supply Voltage
5
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.
6
DEC
1.96V
IF Decoupling
An external decoupling capacitor
is connected to enhance stability.
7
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.
7
V+
2
1
V+
V+
3
6
V+
5


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