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PDF NJM2550 Data sheet ( Hoja de datos )
| Número de pieza | NJM2550 | |
| Descripción | FM IF Demodulator IC / SSOP16 | |
| Fabricantes | JRC | |
| Logotipo |  |
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10.7MHz INPUT FM IF DEMODULATOR
NJM2550
GENERAL DESCRIPTION
The NJM2550 is a wide-operating voltage, low-current FM IF
demodulator IC with 10.7MHz(standard) IF frequency.
It includes a limiting amplifier, quadrature detector, filter amplifier,
FSK/ASK(OOK) comparator, RSSI thermal characteristics correction,
and quick charge circuit
The NJM2550 is suitable for low power, narrow band receiver for
short range data/voice transmission by using IF=10.7MHz or IF/carrier
frequency of up to 50MHz.
PACKAGE OUTLINE
NJM2550V
FEATURES
Wide Range Operating Voltage
2V to 9V
Low Operating Current
4.4mA at V+ =3V
Wide Range IF Input Frequency
10.7MHz (standard)
5MHz to 50MHz (reference value)
Wide Band FM Detector Circuit
1MHz (reference value)
High-speed Transmission Rate
2Mbps (reference value)
FSK/ASK (OOS) Comparator
Two External Resistors to Adjust RSSI ‘s Thermal Characteristics
Bipolar Technology
Package Outline
SSOP16
BLOCK DIAGRAM
RSSI CHARGE COMP
OUT SWITCH OUT
16 15
14
COMP
REF
13
COMP
IN
12
FSK
VREF
11
AMP
OUT
10
AMP
IN
9
+
-- COMP
+ CHARGE
-
BUFF
AMP
RSSI
IF AMP
QUAD DET
1234 5678
RSSI GND
IF DEC V+
IF QUAD AF
REF
IN
OUT
IN
OUT
Ver.2006-02-24
-1-
1 page  
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TERMINAL FUNCTION (Ta=25°C, V+=3 V)
Pin No. SYMBOL
EQUIVARENT CIRCUIT
V+
1 RSSI REF
1
50k
2 GND
3 IF IN
4 DEC
--
64k
165 165
3
4
GND
V+
GND
NJM2550
VOLTAGE
FUNCTION
1.12V
RSSI Reference Current
Control
To control RSSI reference current,
a resistor is connected to pin1 and
pin6, respectively.
The recommended value is 33kΩ.
By choosing the different thermal
coefficient of these two resisters,
RSSI thermal characteristics can
be changed.
-- Ground
IF Limiter Amplifier Input
The typical input impedance is
2.46 330Ω.
2.46V
IF Decoupling
An external decoupling capacitor
is connected to enhance stability.
Supply Voltage
5 V+
5
V+
--
GND
6 IF OUT
6
Ver.2006-02-24
V+
140uA
GND
IF Limiter Amplifier Output
An external phase-shifting coil or
discriminator is connected
between pin6 and pin7.
2.06V
-5-
5 Page 
www.DataSheet4U.com
Pattern Layout
NJM2550
RSSI
OUT
RSSI
REF
OFF
CHARGE
SW
ON
COMP
OUT
20 100kΩ
21 22
7.5kΩ1000pF
12
30pF 33kΩ
51Ω
4
3
0.01uF
IF IN
GND
10uF
19 18 100kΩ
17 100kΩ
330pF
0.01uF
NJM2550
5
8
68kΩ 16
14
15
12 1000pF
3300pF
13
68kΩ 11
68kΩ
2pF
4165-T070
9 (Sumida Corportion)
10
1kΩ
V+
7
0.1uF
AMP
OUT
AF
OUT
Ver.2006-02-24
10uF
6
- 11 -
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet NJM2550.PDF ] | |
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