NJM2295A
FM IF IC FOR REMOTE KEYLESS ENTRY SYSTEM
■
GENERAL DESCRIPTION
The
NJM2295A
is FM IF IC for the remote keyless entry
system (RKE). It includes almost all functions of IF blocks,
from the 1st. Mixer to the wave shaving circuit.
Exclusively designed
NJM2295A
is suited not only for the
RKE, but for other FM signal receivers.
■
PACKAGE OUTLINE
NJM2295AV
■
FEATURES
●
Low Operating Current
●
Low Operating Voltage
●
Local Oscillation Frequency
●
Mixer Active Frequency
●
IF Frequency
●
1st. Mixer Included
●
RSSI Circuit Included
●
FSK Wave Shaping Circuit
●
Bipolar Technology
●
Package Outline
5mA typ. at V
+
=5V
+2.7V to 7.0V
50 to 350MHz
to 450MHz
IF=10.7MHz
SSOP20
■
BLOCK DIAGRAM
Ver.2003-12-09
-1-
NJM2295A
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
(T
a
=25°C)
RATINGS
9.0
300
-40 to +85
-40 to +125
UNIT
V
mW
°C
°C
P
D
T
opr
T
stg
■
ELECTRICAL CHARACTERS
PARAMETER
Supply Voltage
No signal Operating Current
Battery saving Operating Current
Mixer Gain 1
Mixer Gain 2
Mixer Sept Point
Mixer Input Resistance
Mixer Input Capacity
Mixer Output Resistance
If amplifier Input Resistance
Signal to Noise Ratio 1
Signal to Noise Ratio 2
Signal to Noise Ratio 3
-3dB limiting sensitivity
Demodulated Output Level
AM Rejection Ratio
Duty ratio of Wave Shaped Output
RSSI Output Voltage 1
RSSI Output Voltage 2
RSSI Output Voltage 3
RSSI Output Resistance
Quick Charge / discharge current
Low Level Output Voltage of
FSK-OUT
High Level Leak Current of
FSK-OUT Terminal
SYMBOL
V
+
(V
+
=5.0V, T
a
=25°C, fmod=1kHz, fmix=320MHz, fIF=10.7MHz, fdev=±10kHz)
TEST CONDITION
MIN.
2.7
-
-
RL=No Connect.
320MHz Gain - 450MHz Gain
13.5
-
-
f=320MHz
f=320kHz
-
-
-
-
Mixer Input, V
IN
=80dBµVEMF
IF input, V
IN
=80dBµVEMF
IF input, V
IN
=35dBµVEMF
Mixer Input
IF input, V
IN
=60dBµVEMF
IF input, V
IN
=80dBµVEMF, AM=30%
IF input, V
IN
=60dBµVEMF
IF input, V
IN
=20dBµVEMF
IF input, V
IN
=60dBµVEMF
IF input, V
IN
=100dBµVEMF
-
-
-
-
80
-
40
0.35
0.7
1.30
-
35
IL=100µA
-
-
TYP.
-
5.0
-
18.5
1
103
1
2
330
330
60
60
25
22
150
50
50
0.55
1.00
1.75
48
70
0.1
-
MAX.
7.0
7.5
10
22.5
3
-
-
-
-
-
-
-
-
27
-
-
60
0.70
1.3
2.15
-
120
0.4
2
UNIT
V
mA
µA
dB
dB
dBµVEMF
kΩ
pF
Ω
Ω
dB
dB
dB
dBµVEMF
mVrms
dB
%
V
V
V
kΩ
µA
V
µA
I
CCq
I
CCS
Gmix1
Gmix2
IP
R
in
M
C
in
M
R
O
M
R
in
IF
S / N1
S / N2
S / N3
Slim
Vod
AMR
DR
RSSI1
RSSI2
RSSI3
RSSIR
Ich
VfskL
IfskH
-2-
Ver.2003-12-09
NJM2295A
■
APPLICATION CIRCUIT
Ver.2003-12-09
-3-
NJM2295A
■
TERMINAL FUNCTION
PIN No.
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
1
OSC IN
SAW is oscillation input terminal.
2
OSC OUT
Oscillation Output Terminal.
19
MIX IN
Mixer input terminal.
Input impedance :
Parallel resistance : 1kΩ
Parallel capacity : 2pF
4
MIX OUT
Output terminal for mixer.
Output resistance is 330Ω at typical.
6
IF IN
Limiter input terminal.
Input resistance is 330Ω at typical.
7
DEC
Decoupling terminal for bias.
-4-
Ver.2003-12-09
NJM2295A
■
TERMINAL FUNCTION
PIN No.
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
9
LIM OUT
Output terminal for limiter amplifier.
Typical input impedance is 300
ohms.
10
QUAD IN
Input terminal of a quadrature
detection circuit.
Connect with a ceramic
discriminator.
14
RSSI OUT
RSSI output terminal.
11
AF OUT
Demodulated siganl output.
12
LPF IN
Input terminal of a low pass filter.
This terminal is biased from the
AF-OUT terminal (11pin) through an
external RC filter.
Ver.2003-12-09
-5-
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