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PDF NJM2591 Data sheet ( Hoja de datos )
| Número de pieza | NJM2591 | |
| Descripción | FM IF Demodulator IC / SSOP16 | |
| Fabricantes | JRC | |
| Logotipo |  |
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www.DataSheet4U.com
NJM2591
100MHz INPUT 450kHz FM IF DEMODULATOR IC FOR VOICE
GENERAL DESCRIPTION
The NJM2591 is a wide - operating voltage, low – current
FM IF demodulator IC for voice application. It includes an
oscillator, mixer, limiting amplifier, quadrature detector, and
active filter.
The NJM2591 also has a noise detector and noise comparator
with hysteresis range.
PACKAGE OUTLINE
NJM2591V
FEATURES
Wide Operating Voltage
Low Operating Current
Maximum Input Frequency
IF Frequency
Bipolar Technology
Package Outline
1.8V to 9.0V
2.5mA type. at V+ =2.0V
100MHz ( reference value )
450kHz ( standard )
SSOP16
BLOCK DIAGRAM
MIX NOISE NOISE
IF
AF
IN GND REC DET RSSI OUT QUAD OUT
16 15 14 13 12 11 10
9
MIXER
BUFFER
OSC
NOISE RSSI
COMP
NOISE DET
IF AMP
LPF
QUAD
DET
NOISE
AMP
FILTER
AMP
123 45678
OSC OSC MIX
V+ IF IN DEC FIL
FIL
IN OUT OUT
OUT IN
Ver.2004-08-25
-1-
1 page  
www.DataSheet4U.com
Pin No.
SYMBOL
9 AF OUT
EQUIVARENT CIRCUIT
V+
100uA
9
NJM2591
VOLTAGE
FUNCTION
Demodulated Signal
Output.
780mV
10 QUAD
11 IF OUT
12 RSSI
400
10
GND
V+
15k 15k 400
10uA
GND
V+
2.0V
Quadrature Detector Input.
Adding a 90 degree-phase
shifter forms a quadrature
detector circuit.
A 90 degree-phase shifter
mainly consists of a dis-
criminator and a resistor.
IF Output.
Output of IF Amplifier
11
60uA
GND
V+
12
45k
GND
1.18V
71.8mV
Received Signal Strength
Indicator (RSSI) Output.
The output signal level is in
logarithmic proportion to
the IF limiter amplifier input
signal of pin5.
Ver.2004-08-25
-5-
5 Page 
www.DataSheet4U.com
S+N,N,AMR versus Mixer Input
fmix=21.7MHz,fmod=1kHz,fdev=±1.5k,AM=30%,flo=21.25MHz,IF SW:B
10
S+N
0
-10
-20
-30
-40 AMR
-50
N
-60
-70
-20
0 20 40 60 80 100 120
Mixer Input VinMIX (dBuVEMF)
RSSI Output Voltage versus Mixer Input
2.5 fmix=21.7MHz,flo=21.7MHz,IF SW:B
2 V+ = 9V
3V
2V
1.5
1
0.5
0
-20
0 20 40 60 80 100 120
Mixer Input Level VinMIX (dBuVEMF)
Noise Comparator Characteristics
2
1.5
1
0.1V
0.5
0
0 0.4 0.8 1.2 1.6 2
NOISE REC Output (V)
Ver.2004-08-25
NJM2591
S+N,N,AMR versus IF Input
fif=450kHz,fdev=±1.5kHz,fmod=1kHz,AM=30%,IF SW:A
10
0 S+N
-10
-20
-30
-40
AMR
-50
-60 N
-70
-20
0 20 40 60 80 100 120
IF Input VinIF (dBuVEMF)
RSSI Output Voltage versus IF Input
fif=450kHz,IF SW:A
2.5
2 V+ = 9V
3V
2V
1.5
1
0.5
0
-20
0 20 40 60 80 100 120
IF Input Level VinIF (dBuVEMF)
Noise Detector Characteristics
1.2 fnoise=31kHz
1.0
0.8
0.6
0.4
0.2
0.0
0
0.1 0.2 0.3 0.4
Filter Amplifier Input (mVrms)
0.5
- 11 -
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet NJM2591.PDF ] | |
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