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NJM2593V Datasheet

  • NJM2593V

  • 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC

  • 16頁

  • NJRC

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NJM2593
50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC
GENERAL DESCRIPTION
The NJM2593
is a wide-operating voltage, low-current
FM IF demodulator IC with 450kHz(standard) IF frequency.
It includes an oscillator, mixer, limiting amplifier, quadrature
detector, active filter, and FSK comparator.
The NJM2593
also has a RSSI circuit and RSSI comparator
for carrier sense.
NJM2593V
PACKAGE OUTLINE
FEATURES
Wide Operating Voltage
1.8V to 9.0V
Low Operating Current
1.2mA type. at V
+
=2.0V, external local oscillator input
Maximum Mixer Input Signal
Frequency
50MHz (reference value)
Mixer Input Resistance
4.5k鈩?(reference value)
IF Frequency
450kHz (standard)
Conventional Quadrature Detector
External Phase-shifting Capacitor
External Discriminator or LC Resonant Circuit
RSSI Comparator with Open-Collector Output
Quick Charge/Discharge Circuit for FSK Reference Voltage
Bipolar Technology
Package Outline
SSOP20
BLOCK DIAGRAM
MIX
IN
20
SENSE RSSI
CARRIER
FSK
CHARGE
LPF
SW
OUT
GND LEVEL OUT SENSE OUT
19
18
17
+
-
16
15
-
+
14
13
+
-
FILTER AMP
LPF
IN
12
AF
OUT
11
MIXER
RSSI COMP FSK COMP
BUFFER
RSSI
+
-
IF AMP
CHARGE
QUAD
DET
OSC
1
OSC
(B)
2
OSC
(E)
3
MIX
OUT
4
V+
5
IF
IN
6
DEC
7
8
9
10
QUAD
IN
IF
FSK
FSK
VREF1 VREF2 OUT
Ver.2004-08-25
-1-

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