NJM2294
FM IF IC FOR PAGER
■
GENERAL DESCRIPTION
NJM2294
is a super low current FM IF IC for pagers. It includes
almost all functions of the paging IF system. In those functions, the
RSSI function can be used for automatic gain control. When the
electric field strength is high, the RSSI output signal can control the
attenuation of an RF amplifier to improve the received condition.
■
PACKAGE OUTLINE
NJM2294V
■
FEATURES
●
Low Operating Voltage
(V
+
=1.1 to 4.0V)
●
Super low Operating Current (600µA, V
+
=1.4V)
●
RSSI (Received Signal Strength Indicator)
●
FSK wave shaper
●
Battery check alarm function (Alarm Voltage=1.1V typ.)
●
Battery saving function
●
A high output current voltage regurator with an external transistor (Vreg=1.0V typ.)
●
A ceramic discriminator is available.
●
Package Outline
SSOP16
●
Bipolar Technology
■
RECOMMENDED OPERATIONAL CONDITION
●
Operating Voltage
V
+
1.1 to 4.0V
■
PIN CONFIGURATION
NJM2294V
Ver.2003-12-09
-1-
NJM2294
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V+
P
D
T
opr
T
stg
RATINGS
5
300
-20 to +75
-40 to +125
(T
a
=25°C)
UNIT
V
mW
°C
°C
■
ELECTRICAL CHARACTERISTICS
PARAMETER
No signal Operating Current
Battery saving Operating Current
IF amplifier input resistance
S/N1
S/N2
-3dB limitting sensitivity
Demodulated output level
AM rejection ratio
Duty ratio of wave shaped output
RSSI output voltage
RSSI output resistance
Quick charge / discharge current
Alarm voltage
Regulator output voltage
Low level output voltage of VALM
terminal
High level leak current of VALM terminal
Low level output voltage of FSK-OUT
terminal
High level leak current of FSK-OUT
terminal
Low level output voltage of REG-CONT
terminal
SYMBOL
I
CCq
I
CCs
R
IN
S/N1
S/N2
V
IN
(lim)
V
OD
AMR
DR
V
RSSI
R
RSSI
Ich
V
alm
V
reg
V
alm
L
I
alm
H
V
fsk
L
I
fsk
H
V
reg
L
TEST
CIRCUIT
11
12
-
1
1
1
1
1
2
10
-
13
3
8
4
5
6
7
9
(V
+
=14V, f
i
=455kHz, fmod=600Hz, fdev=±4kHz,T
a
=25°C)
TEST CONDITION
V
I
=0, 10pin=V
+
MIN.
-
-
-
TYP.
600
0
2
62
35
22
46
50
50
0.62
62
65
1.10
1.00
0.1
0
0.1
0
-
MAX.
900
5
-
-
-
27
65
-
60
0.76
-
110
1.15
1.05
0.4
2
0.4
2
0.6
UNIT
µA
µA
kΩ
dB
dB
dBµEMF
mVrms
dB
%
V
kΩ
µA
V
V
V
µA
V
µA
V
V
I
=0, 10pin=GND
V
I
=60dBµEMF
V
I
=25dBµEMF
-
-
-
V
I
=60dBµEMF
V
I
=60dBµEMF, AM=30%
V
I
=60dBµEMF
V
I
=80dBµEMF
30
-
40
0.48
-
4pin=GND, 8pin=0.18V
35
1.05
RL=430Ω
IL=100µA
0.95
-
-
IL=100µA
-
-
IL=100µA
-
-2-
Ver.2003-12-09
工业自动化与控制
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