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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
+
(Ta=25C)
RATINGS 10 300 -30 to +85 -40 to +125 UNIT V mW C C
Pd Topr Tstg
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 ICC GMIX RMIX LIMIT VOUT Af Vref VRMAX VRMIN Hys SPHI SPLO SNHI SNLO
(V+=2.4V, fC=21.7MHz, fmod=1kHz 1mV, fdev=3kHz, Ta=25C)
TEST CONDITION No signal, Squelch off 20 2.7 -3dB limiting VI=1mVrmsy, 1kHz Rrs=18k, IFin=100mVrms Rrs=18k, No signal Rhys=4.7k 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 k Vrms mVrms dB V V V mV V V V V
4.5
1.05 1.2 0.5 105 1.8 0,2
30k pull up 30k pull up
TEST CIRCUIT
-2-
Ver.2003-12-09
NJM2292
TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOLTAGE(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 100F 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 VOLTAGE(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 VOLTAGE(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-
NJM2292
TERMINAL FUNCTION (V+=2.4V)
PIN NO. SYMBOL PIN VOLTAGE(typ.) FUNCTION A hysteresis control terminal. (ESD protection diodes are connected internally with this terminal.) EQUIVALENT CIRCUIT
18
HYSTERESIS CONTROL
-
19
GND
0V
Ground A mixer input
20
MIX IN
2.4V
[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

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