NJM2292
NARROW BAND FM IF IC
■
GENERAL DESCRIPTION
The
NJM2292
is a narrow band FM IF IC designed for use in cordless
telephones and amature radios, etc...It contains almost all blocks of the
narrow band FM IF system-a mixer, an IF amplifier, an RSSI and a
Quadrature detector, for example. It features low supply current to make
a sharp reduction of total power consumption possible.
■
PACKAGE OUTLINE
NJM2292V
■
FEATURES
●
Low Operating Voltage
●
Low Operating Current
●
Maximum input frequency
●
A ceramic discriminator is available
●
Package Outline
●
Bipolar Technology
(1.8 to 7.0V)
(20mA typ. @V
+
=2.4V)
(100MHz)
SSOP20
■
APPLICATIONS
●
Amature radios
●
Cordless telephones, etc.
■
PIN CONFIGURATION
NJM2292V
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
(T
a
=25°C)
RATINGS
10
300
-30 to +85
-40 to +125
UNIT
V
mW
°C
°C
P
d
T
opr
T
stg
Ver.2003-12-09
-1-
NJM2292
■
ELECTRICAL CHARACTERISTICS
PARAMETER
Operating Current
Mixer
Gain
Input resistance
Limiting sensitivity
Audio output voltage
Filter amplifier gain
Filter amplifier output voltage
RSSI maximum output voltage
RSSI minimum output voltage
Squelch Hysteresis
Squelch output voltage High level
Low level
Squelch inverted output voltage High level
Low level
SYMBOL
I
CC
G
MIX
R
MIX
LIMIT
V
OUT
A
f
V
ref
V
RMAX
V
RMIN
Hys
S
PHI
S
PLO
S
NHI
S
NLO
(V
+
=2.4V, f
C
=21.7MHz, fmod=1kHz 1mV, fdev=±3kHz, T
a
=25°C)
TEST CONDITION
No signal, Squelch off
20
2.7
-3dB limiting
V
I
=1mVrmsy, 1kHz
R
rs
=18kΩ, IF
in
=100mVrms
R
rs
=18kΩ, No signal
R
hys
=4.7kΩ
50
45
0.75
0.65
30
1.0
2.2
0.2
MIN.
TYP.
2.0
25
3.6
3.0
70
48
0.9
0.9
80
1.4
MAX.
2.7
UNIT
mA
dB
kΩ
µVrms
mVrms
dB
V
V
V
mV
V
V
V
V
4.5
1.05
1.2
0.5
105
1.8
0,2
30kΩ pull up
30kΩ pull up
■
TEST CIRCUIT
-2-
Ver.2003-12-09
NJM2292
■
TERMINAL FUNCTION
(V
+
=2.4V)
PIN NO.
SYMBOL
PIN VOL-
TAGE(typ.)
FUNCTION
These terminals are connected with a
crystal resonator to construct a colpitts
circuit.
EQUIVALENT CIRCUIT
1
OSC IN
2.4V
2
OSC OUT
1.7V
3
NC
No connection.
Amixer output.
4
MIX OUT
1.47V
5
V
+
2.4V
Supply voltage
A limiter input and decoupling terminals.
The 7 and 8 pins are connected with
about 100µF capacitors.
(ESD protection diodes are connected
internally with each terminal.)
6
LIM IN
1.59V
7
DEC1
1.59V
8
DEC2
1.59V
A limiter output
9
LIM OUT
-
Ver.2003-12-09
-3-
NJM2292
■
TERMINAL FUNCTION
(V
+
=2.4V)
PIN NO.
SYMBOL
PIN VOL-
TAGE(typ.)
FUNCTION
A quadrature detector input
EQUIVALENT CIRCUIT
10
QUAD COIL
-
The output of the FM demodulated
signal.
11
AF OUT
1.18V
An RSSI output.
The output current signal is in
logarithmic proportion to the input
signal.
12
RSSI
-
An operational amplifier inverted input.
13
AMP IN
-
-4-
Ver.2003-12-09
NJM2292
■
TERMINAL FUNCTION
(V
+
=2.4V)
PIN NO.
SYMBOL
PIN VOL-
TAGE(typ.)
FUNCTION
An operational amplifier output.
EQUIVALENT CIRCUIT
14
AMP OUT
-
A squelch amplifier input.
(ESD protection diodes are connected
internally with this terminal.)
15
SQ IN
-
A squelch amplifier input.
(ESD protection diodes are connected
internally with this terminal.)
16
SQ OUT
-
A squelch amplifier inverted output.
(ESD protection diodes are connected
internally with this terminal.)
17
SQ OUT
-
Ver.2003-12-09
-5-
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