NJM2592 Datasheet, PDF (1/3 Pages) New Japan Radio – 470MHz INPUT 455kHz FM IF DEMODULATOR

NJM2592
Under Development
470MHz INPUT 455kHz FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2592 is a low-voltage, low-current FM IFdemodulator IC
with 455kHz(standard) IF frequency. It includes an oscillator, mixer,
limiting amplifier, quadrature detector,active filter, and FSK comparator.
The NJM2592 also has a RSSI circuit and RSSI comparator for
carrier sense.
FEATURES
Low Operating Voltage 1.8V to 5.5V
Low Operating Current 3.5mA at V⁺ =2.0V
Operating Frequency
up to 470MHz (reference value)
IF Input Frequency
455kHz (standard)
Ceramic Discriminator or LC resonant Circuit
FSK Comparator with Open-collector Output
Quick Charge /Discharge Circuit for FSK Reference Voltage
Bipolar Technology
Package Outline
SSOP20
PACKAGE OUTLINE
NJM2592V
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
RSSI COMP ^{FSK COMP}
FILTER AMP
RSSI
CHARGE
IIFFAAMMPP
QUAD
DET
1
2
3
4
OSC OSC MIX V+
(B) (E) OUT
5
6
7
8
9
10
IF DEC FSK NC IF QUAD
IN
REF
OUT IN
Ver.2003-05-15
-1 -