NJM2550 Datasheet, PDF (1/15 Pages) New Japan Radio – 10.7MHz INPUT FM IF DEMODULATOR

NJM2550
10.7MHz INPUT FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2550 is a wide-operating voltage, low-current FM IF
demodulator IC with 10.7MHz(standard) IF frequency.
It includes a limiting amplifier, quadrature detector, filter amplifier,
FSK/ASK(OOK) comparator, RSSI thermal characteristics correction,
and quick charge circuit
The NJM2550 is suitable for low power, narrow band receiver for
short range data/voice transmission by using IF=10.7MHz or IF/carrier
frequency of up to 50MHz.
PACKAGE OUTLINE
NJM2550V
FEATURES
Wide Range Operating Voltage
2V to 9V
Low Operating Current
4.4mA at V⁺ =3V
Wide Range IF Input Frequency
10.7MHz (standard)
5MHz to 50MHz (reference value)
Wide Band FM Detector Circuit
1MHz (reference value)
High-speed Transmission Rate
2Mbps (reference value)
FSK/ASK (OOS) Comparator
Two External Resistors to Adjust RSSI ‘s Thermal Characteristics
Bipolar Technology
Package Outline
SSOP16
BLOCK DIAGRAM
RSSI ^CHARGE COMP
OUT ^SWITCH OUT
16
15
14
COMP
REF
13
COMP
IN
12
FSK
VREF
11
AMP
OUT
10
AMP
IN
9
+
-^{- COMP}
+ _CHARGE
-
BUFF
AMP
RSSI
IF AMP
QUAD DET
1
2
3
4
5
6
7
8
RSSI ^GND
IF
DEC
V+
IF QUAD AF
REF
IN
OUT
IN
OUT
Ver.2006-02-24
-1-