NJM2593 Datasheet, PDF (1/16 Pages) New Japan Radio – 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC

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.
PACKAGE OUTLINE
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
FEATURES
Wide Operating Voltage
Low Operating Current
1.8V to 9.0V
1.2mA type. at V⁺ =2.0V, external local oscillator input
Maximum Mixer Input Signal
Frequency
50MHz (reference value)
Mixer Input Resistance
4.5kΩ (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
SENSE RSSI CARRIER FSK CHARGE LPF LPF AF
IN GND LEVEL OUT SENSE OUT SW OUT IN OUT
20 19 18 17 16 15 14 13 12 11
MIXER
BUFFER
OSC
1
OSC
(B)
2
OSC
(E)
3
MIX
OUT
+
-
-
+
RSSI COMP FSK COMP
+
-
FILTER AMP
RSSI
+
-
IF AMP
CHARGE
QUAD
DET
4
5
6
7
8
9
10
V+
IF DEC FSK FSK IF QUAD
IN
VREF1 VREF2 OUT IN
Ver.2004-08-25
-1-