NJRC NJM2295A Fm if ic for remote keyless entry system Datasheet

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.
■ 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
■ PACKAGE OUTLINE
NJM2295AV
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
(Ta=25°C)
SYMBOL
RATINGS
UNIT
Supply Voltage
+
V
9.0
V
Power Dissipation
PD
300
mW
Operating Temperature Range
Topr
-40 to +85
°C
Storage Temperature Range
Tstg
-40 to +125
°C
(V+=5.0V, Ta=25°C, fmod=1kHz, fmix=320MHz, fIF=10.7MHz, fdev=±10kHz)
■ ELECTRICAL CHARACTERS
PARAMETER
SYMBOL
TEST CONDITION
+
MIN.
TYP.
MAX.
UNIT
Supply Voltage
V
2.7
-
7.0
V
No signal Operating Current
ICCq
-
5.0
7.5
mA
Battery saving Operating Current
ICCS
-
-
10
µA
13.5
18.5
22.5
dB
-
1
3
dB
-
103
-
dBµVEMF
Mixer Gain 1
Gmix1
RL=No Connect.
Mixer Gain 2
Gmix2
320MHz Gain - 450MHz Gain
Mixer Sept Point
IP
Mixer Input Resistance
RinM
f=320MHz
-
1
-
kΩ
Mixer Input Capacity
CinM
f=320kHz
-
2
-
pF
Mixer Output Resistance
ROM
-
330
-
Ω
If amplifier Input Resistance
RinIF
-
330
-
Ω
Signal to Noise Ratio 1
S / N1
Mixer Input, VIN=80dBµVEMF
-
60
-
dB
Signal to Noise Ratio 2
S / N2
IF input, VIN=80dBµVEMF
-
60
-
dB
Signal to Noise Ratio 3
S / N3
IF input, VIN=35dBµVEMF
-
25
-
dB
-3dB limiting sensitivity
Slim
Mixer Input
-
22
27
dBµVEMF
Demodulated Output Level
Vod
IF input, VIN=60dBµVEMF
80
150
-
mVrms
AM Rejection Ratio
AMR
IF input, VIN=80dBµVEMF, AM=30%
-
50
-
dB
Duty ratio of Wave Shaped Output
DR
IF input, VIN=60dBµVEMF
40
50
60
%
RSSI Output Voltage 1
RSSI1
IF input, VIN=20dBµVEMF
0.35
0.55
0.70
V
RSSI Output Voltage 2
RSSI2
IF input, VIN=60dBµVEMF
0.7
1.00
1.3
V
RSSI Output Voltage 3
RSSI3
IF input, VIN=100dBµVEMF
1.30
1.75
2.15
V
RSSI Output Resistance
RSSIR
-
48
-
kΩ
Ich
35
70
120
µA
-
0.1
0.4
V
-
-
2
µA
Quick Charge / discharge current
Low Level Output Voltage of
FSK-OUT
VfskL
High Level Leak Current of
FSK-OUT Terminal
IfskH
-2-
IL=100µA
Ver.2003-12-09
NJM2295A
■ APPLICATION CIRCUIT
Ver.2003-12-09
-3-
NJM2295A
■ TERMINAL FUNCTION
PIN No.
SYMBOL
1
OSC IN
2
OSC OUT
Oscillation Output Terminal.
19
MIX IN
Mixer input terminal.
Input impedance :
Parallel resistance : 1kΩ
Parallel capacity : 2pF
4
MIX OUT
6
IF IN
Limiter input terminal.
Input resistance is 330Ω at typical.
7
DEC
Decoupling terminal for bias.
-4-
FUNCTION
EQUIVALENT CIRCUIT
SAW is oscillation input terminal.
Output terminal for mixer.
Output resistance is 330Ω at typical.
Ver.2003-12-09
NJM2295A
■ TERMINAL FUNCTION
PIN No.
SYMBOL
FUNCTION
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.
LPF IN
Input terminal of a low pass filter.
This terminal is biased from the
AF-OUT terminal (11pin) through an
external RC filter.
12
Ver.2003-12-09
EQUIVALENT CIRCUIT
-5-
NJM2295A
■ TERMINAL FUNCTION
PIN No.
SYMBOL
13
LPF OUT
Output terminal of a low pass filter.
8
FSK REF
Reference input terminal of a wave
shaping comparator. Connected
with an external capacitor.
FSK OUT
Output terminal of a wave shaping
circuit. The Wave shaped signal
inverted for the LPF output comes
out.
BS
Control terminal of a battery saving
circuit.
H : This circuit is ON.
L : This circuit is OFF.
16
CHARGE
Control terminal of a quick charge /
discharge circuit.
H : This circuit is ON.
L : This circuit is OFF.
5
V1
3
GND1
20
V2
18
GND2
17
15
+
+
FUNCTION
EQUIVALENT CIRCUIT
On and ;after IF supply voltage.
-
On and after IF ground.
-
Supply voltage for mixer and OSC.
-
Ground for mixer and OSC
-
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
-6-
Ver.2003-12-09
Similar pages