NJM2552
100MHz INPUT MIXER AND 450kHz FM/AM IF DEMODULATOR IC
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! PACKAGE OUTLINE
GENERAL DESCRIPTION
The NJM2552 is a FM IF demodulator IC with 450kHz (standard)
IF input, which operates from 2.2V to 9.0V supply. It includes an oscillator,
mixer, limiting amplifier, FM/AM detectors, and RSSI circuit.
The NJM2552 is suitable for FM /AM receivers for data / voice radio
systems.
NJM2552V
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FEATURES
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Wide Operating Voltage
Low Operating Current
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Maximum Mixer Input Frequency
IF Frequency
AM/FM detector circuits selectable
AM SW= HIGH
Simultaneous operation of AM/FM sections
AM SW= LOW
FM section only
Built-in AGC circuit in AM section
Wide Range RSSI (Received Signal Strength Indication)
Bipolar Technology
Package Outline
SSOP20
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2.2V to 9.0V
FM: 2.5mA at V+ =2.7V, AM SW =LOW
AM and FM: 5mA at V+ =2.7V, AM SW =HIGH
100MHz (reference value)
450kHz (standard)
BLOCK DIAGRAM
MIX
IN
V+
20
19
AM AGC RF AGC
IN
OUT
18
17
RSSI
OUT
16
AM
SW
15
AM AF
OUT
14
AMP
OUT
13
AM
DET
AMP
IN
12
FM AF
OUT
11
AMP
-A
RSSI
MIXER
OSC
AMP
AGC
AM AMP
+ -
FM AMP
+
-
FM
DET
1
3
4
5
6
7
8
9
10
OSC
(B)
Ver.2007-10-24
2
OSC
(E)
MIX
OUT
GND
AM IF
IN
AM
DEC
FM IF IN
FM
DEC
FM IF
OUT
QUAD
IN
-1-
