NJM2292
-1-
Ver.2003-12-09
NARROW BAND FM IF IC
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
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.
■ FEATURES
● Low Operating Voltage (1.8 to 7.0V)
● Low Operating Current (20mA typ. @V+=2.4V)
● Maximum input frequency (100MHz)
● A ceramic discriminator is available
● Package Outline SSOP20
● Bipolar Technology
■ APPLICATIONS
● Amature radios
● Cordless telephones, etc.
■ PIN CONFIGURATION
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage V+ 10 V
Power Dissipation Pd 300 mW
Operating Temperature Range Topr -30 to +85 °C
Storage Temperature Range Tstg -40 to +125 °C
NJM2292V
NJM2292V
NJM2292
- 2 - Ver.2003-12-09
■ ELECTRICAL CHARACTERISTICS (V+=2.4V, fC=21.7MHz, fmod=1kHz 1mV, fdev=±3kHz, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Operating Current ICC No signal, Squelch off 2.0 2.7 mA
Mixer
Gain GMIX 20 25 dB
Input resistance RMIX 2.7 3.6 4.5 kΩ
Limiting sensitivity LIMIT -3dB limiting 3.0 µVrms
Audio output voltage VOUT 50 70 mVrms
Filter amplifier gain Af V
I=1mVrmsy, 1kHz 45 48 dB
Filter amplifier output voltage Vref 0.75 0.9 1.05 V
RSSI maximum output voltage VRMAX R
rs=18kΩ, IFin=100mVrms 0.65 0.9 1.2 V
RSSI minimum output voltage VRMIN R
rs=18kΩ, No signal 0.5 V
Squelch Hysteresis Hys Rhys=4.7kΩ 30 80 105 mV
Squelch output voltage High level SPHI 1.0 1.4 1.8 V
Low level SPLO 0,2 V
Squelch inverted output voltage High level SNHI 30kΩ pull up 2.2 V
Low level SNLO 30kΩ pull up 0.2 V
■ TEST CIRCUIT
NJM2292
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3
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Ver.2003-12-09
■ TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOL-
TAGE(typ.) FUNCTION EQUIVALENT CIRCUIT
1 OSC IN 2.4V
2 OSC OUT 1.7V
These terminals are connected with a
crystal resonator to construct a colpitts
circuit.
3 NC No connection.
4 MIX OUT 1.47V
Amixer output.
5 V+ 2.4V Supply voltage
6 LIM IN 1.59V
7 DEC1 1.59V
8 DEC2 1.59V
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.)
9 LIM OUT -
A limiter output
NJM2292
- 4 - Ver.2003-12-09
■ TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOL-
TAGE(typ.) FUNCTION EQUIVALENT CIRCUIT
10 QUAD COIL -
A quadrature detector input
11 AF OUT 1.18V
The output of the FM demodulated
signal.
12 RSSI -
An RSSI output.
The output current signal is in
logarithmic proportion to the input
signal.
13 AMP IN -
An operational amplifier inverted input.
NJM2292
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5
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Ver.2003-12-09
■ TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOL-
TAGE(typ.) FUNCTION EQUIVALENT CIRCUIT
14 AMP OUT -
An operational amplifier output.
15 SQ IN -
A squelch amplifier input.
(ESD protection diodes are connected
internally with this terminal.)
16 SQ OUT -
A squelch amplifier input.
(ESD protection diodes are connected
internally with this terminal.)
17 OUTSQ -
A squelch amplifier inverted output.
(ESD protection diodes are connected
internally with this terminal.)
NJM2292
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6
- Ver.2003-12-09
■ TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOL-
TAGE(typ.) FUNCTION EQUIVALENT CIRCUIT
18 HYSTERESIS
CONTROL -
A hysteresis control terminal.
(ESD protection diodes are connected
internally with this terminal.)
19 GND 0V Ground
20 MIX IN 2.4V
A mixer input
[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.
