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PDF NJM2592 Data sheet ( Hoja de datos )
| Número de pieza | NJM2592 | |
| Descripción | FM IF Demodulator IC / SSOP20 | |
| Fabricantes | JRC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJM2592 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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www.DataSheet4U.com
NJM2592
470MHz INPUT MIXER AND 455kHz FM IF DEMODULATOR IC
GENERAL DESCRIPTION
The NJM2592 is a wide-operating voltage, low-current
FM IF demodulator IC with 455kHz(standard) IF frequency.
PACKAGE OUTLINE
It includes an oscillator, mixer, limiting amplifier, quadrature
detector, active filter, and FSK comparator.
The NJM2592 also has a RSSI circuit and RSSI comparator
for carrier sense.
NJM2592V
FEATURES
Wide Operating Voltage
Low Operating Current
1.8V to 9.0V
2.2mA type. at V+ =2.0V, external local oscillator input
Maximum Mixer Input Signal
Frequency
470MHz (reference value)
Level
0dBm
Mixer Input Resistance
50Ω
IF Frequency
455kHz (standard)
Conventional Quadrature Detector
External Phase-shifting Capacitor
External Discriminator or LC Resonant Circuit
RSSI Comparator with Open-Collector Output
Quick Charge/Discharge Circuit for FSK Reference Voltage
Bipolar Technology
Package Outline
SSOP20
BLOCK DIAGRAM
MIX SENSE RSSI CARRIER FSK CHARGE LPF LPF AF
IN GND LEVEL OUT SENSE OUT SW OUT IN OUT
20 19 18 17 16 15 14 13 12 11
MIXER
BUFFER
OSC
1
OSC
(B)
2
OSC
(E)
3
MIX
OUT
+-
-+
RSSI COMP FSK COMP
+
-
FILTER AMP
RSSI
+
-
IF AMP
CHARGE
QUAD
DET
4 5 6 7 8 9 10
V+ IF DEC FSK FSK IF QUAD
IN VREF1 VREF2 OUT IN
Ver.2004-08-25
-1-
1 page  
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TERMINAL FUNCTION (Ta=25°C, V+=2.0V)
Pin No. SYMBOL
EQUIVARENT CIRCUIT
1 OSC (B)
2 OSC (E)
1
2
V+
20p
NJM2592
VOLTAGE
FUNCTION
Base / Emitter Terminal
Colpitts - type oscillator is formed
with an external oscillator element
- of crystal unit or SAW resonator.
Output of an external oscillator
circuit can also input to pin1 or
pin2.
-
3 MIX OUT
1.4k
3
Mixer Output
V+
An external 455kHz ceramic filter is
connected. The typical output
impedance is 2kΩ.
1.1V
4 V+
5 IF IN
6 DEC
7 FSK VREF1
V+
50k
1k 1k
5
6
V+
7
-
1.94V
Supply Voltage
IF Limiter Amplifier Input
This is an input to the IF amplifier
after passing through 455kHz
ceramic filter. The typical input
impedance is 2kΩ.
1.94V
IF Decoupling
An external decoupling capacitor
is connected to enhance stability.
0.55V
FSK Reference Input
This pin is an input of reference
voltage for FSK comparator. An
external capacitor is connected to
create an average DC level of FM
demodulated signal. The choice of
this capacitor is dependent on the
speed of data signal.
A quick charge/discharge circuit
offers the voltage of pin 7 comes
the same voltage of pin 11 quickly.
Ver.2004-08-25
-5-
5 Page 
www.DataSheet4U.com
Circuit Side View
Position of C2
for the case of IF-input Local IN
RF IN
NJM2592
R8 C1
IF IN
CF
CF
R9
C4
C12
CD
IC1
NJM2592
R7
R2
C8
R3
SW
SW
R5
SENSE
LEVEL
RSSI
R6
CARRIER
SENSE
FSK OUT
Ground Side View
V+ AF OUT
Vcc : Charge ON
GND: Charge OFF
Note:
1. External Components
C1, C3, C9,C10=1000pF C2,C4=0.1uF C5=33pF C6=0.01uF C7=560p
C11=0.47uF C12,C13=10uF
R1=3.3kΩ R2,R3,R4=68kΩ R5,R6=100kΩ R7,R10=0Ω R8,R9=51Ω
CF=CFWLB455KEFA004-B0 CD=CDBCB455KCAY71-B0
C8=3300pF
Ver.2004-08-25
- 11 -
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NJM2592.PDF ] | |
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