NJM2590V-TE1 Datasheet, PDF (1/16 Pages) New Japan Radio – 455kHz INPUT FM IF DEMODULATOR

NJM2590/97
455kHz INPUT FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2590 and NJM2597 are low current FM IF demodulator
ICs with 455kHz IF input, which operate from 1.6V supply.
The NJM2590/97 contain the minimum functions required to
FM IF demodulator, that is, IF amplifier, quadrature detector,
LPF amplifier, FSK comparator, RSSI, and RSSI comparator.
It offers unmatched design flexibility.
PACKAGE OUTLINE
NJM2590V/97V
FEATURES
Low Operating Voltage 1.6V to 5.5V
Low Operating Current 550uA at V⁺ =1.8V
IF Input Frequency
455kHz (standard)
RSSI Comparator
The Range of Linear Area on RSSI Output versus IF Input Characteristics
NJN2590
IF Input level=25 to 60 dBuVEMF (reference value)
NJM2597
IF Input level=35 to 85 dBuVEMF (reference value)
Bipolar Technology
Package Outline
SSOP14
BLOCK DIAGRAM
V^{+ CARRIER} SENSE RSSI
SENSE LEVEL OUT
14
13
12
11
FSK CHARGE ^LPF
OUT
OUT
10
9
8
RSSI
COMP
RSSI
IF AMP
FSK
COMP
CHARGE
QUAD DET
LPF
1
2
3
4
5
6
7
IF IN GND DEC FSK QUAD AF
LPF
REF IN OUT IN
Ver.2004-08-25
-1-