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PDF NJM2590 Data sheet ( Hoja de datos )

Número de pieza NJM2590
Descripción (NJM2590 / NJM2597) FM IF Demodulator IC / SSOP14
Fabricantes JRC 
Logotipo JRC Logotipo



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NJM2590/97
455kHz INPUT FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2590 and NJM2597 are low current FM IF demodulator
ICs with 455kHz IF input, which operate from 1.6V supply.
The NJM2590/97 contain the minimum functions required to
FM IF demodulator, that is, IF amplifier, quadrature detector,
LPF amplifier, FSK comparator, RSSI, and RSSI comparator.
It offers unmatched design flexibility.
PACKAGE OUTLINE
NJM2590V/97V
FEATURES
Low Operating Voltage 1.6V to 5.5V
Low Operating Current 550uA at V+ =1.8V
IF Input Frequency
455kHz (standard)
RSSI Comparator
The Range of Linear Area on RSSI Output versus IF Input Characteristics
NJN2590
IF Input level=25 to 60 dBuVEMF (reference value)
NJM2597
IF Input level=35 to 85 dBuVEMF (reference value)
Bipolar Technology
Package Outline
SSOP14
BLOCK DIAGRAM
V+ CARRIER SENSE RSSI
SENSE LEVEL OUT
14 13 12 11
FSK CHARGE LPF
OUT
OUT
10 9
8
RSSI
COMP
RSSI
IF AMP
FSK
COMP
CHARGE
QUAD DET
LPF
1
IF IN
23
GND DEC
45 6
FSK QUAD AF
REF IN OUT
7
LPF
IN
Ver.2004-08-25
-1-

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NJM2590 pdf
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Test Circuit 7
IfskH
Test Circuit 8
IcryH
10
100k V
V+
IfskH = V/100k
NJM2590/97
13
100k V
V+
IcryH = V/100k
Test Circuit 9
VcryL
100uA
13 V+
V
VcryL
Test Circuit 10
Ilevel
12
A
Ilevel
SENSE
LEVEL
0.8V
Ver.2004-08-25
-5-

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NJM2590 arduino
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NJM2590/97
3. Carrier sense
The result of comparator is output to pin13 by comparing the output voltage of pin11 with external reference voltage
of pin 12. Because pin13 is an open-collector terminal, an external resistor can be connected to another power
supply within the limit of absolute maximum ratings.
-
11
1000pF
+
12
SENSE
LEVEL
13
V+
100k
4. RSSI circuit (RSSI)
A DC voltage corresponding to the input level of pin1 is output to pin11. The internal resistance of pin11 is around 48
k. The RSSI characteristics can be changed by adding an external resistor,. In such a case, note that the
temperature characteristics of pin 11 may alter due to a disparity between the temperature coefficient of the external
resistor and the internal resistor of pin 11.
V+
500
300
11
48k
1000pF Rext
5. Low pass filter (LPF)
This is a 3rd-order multiple feedback filter.
The cut-off frequency Fc is obtained by ;
Fc
= 2π
3
1
RaRbRcCaCb
Cc
[ Hz ]
where Ra=Rb=Rc or Ca=Cb=Cc
Each of pin7(LPF IN) and pin8(LPF OUT) has a built-in ESD protective resistor 300.
300
+
-
300
6
Ra
68k
Rb
68k
Ca
3300pF
7
Rc
68k
Cc
0.01uF
Cb
560pF
8
Ver.2004-08-25
- 11 -

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