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PDF NJM2593 Data sheet ( Hoja de datos )
| Número de pieza | NJM2593 | |
| Descripción | FM IF Demodulator IC / SSOP20 | |
| Fabricantes | JRC | |
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NJM2593
50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC
GENERAL DESCRIPTION
The NJM2593 is a wide-operating voltage, low-current
FM IF demodulator IC with 450kHz(standard) IF frequency.
PACKAGE OUTLINE
It includes an oscillator, mixer, limiting amplifier, quadrature
detector, active filter, and FSK comparator.
The NJM2593 also has a RSSI circuit and RSSI comparator
for carrier sense.
NJM2593V
FEATURES
Wide Operating Voltage
Low Operating Current
1.8V to 9.0V
1.2mA type. at V+ =2.0V, external local oscillator input
Maximum Mixer Input Signal
Frequency
50MHz (reference value)
Mixer Input Resistance
4.5kΩ (reference value)
IF Frequency
450kHz (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  
www.DataSheet4U.com
NJM2593
External components
C D : Ceramic discriminator, CDBCB450KCAY70-R0 (Murata Manufacturing Co., Ltd, Japan)
IF FILTER : Ceramic filter, CFWCA450KGFA-R0 (Murata Manufacturing Co., Ltd., Japan)
Measurement condition
“Condition1” is the condition for the case of IF input :
IF SW
: in the A position.
IF IN input signal : input frequency(fif) = 450kHz, input level(VinIF)= 60dBuVEMF,
modulation frequency(fmod)=600Hz, deviation fdev=±2kHz
“Condition 2” is the condition for the case of Mixer Input :
IF SW
: in the B position
MIX IN input signal: input frequency(fmix)=21.7MHz, input level(VinMIX)=60dBuVEMF,
modulation frequency(fmod)=600Hz, deviation fdev=±2kHz
OSC(E)input signal: input frequency(fosc)=21.25MHz, input level(VinOSC)=105dBuVEMF
CERAMIC DISCRIMINATOR (especially designed for NJM2592)
To optimize some important performance, the following ceramic discriminator CD is available. For more information
on this CD and 450kHz CD, please contact the CD supplier.
CDBKB450KCAY75-R0 (Murata Manufacturing Co., Ltd., Japan)
Ver.2004-08-25
-5-
5 Page 
NJM2593
www.DataSheet4U.com
EVALUATION PC BOARD
The evaluation board is useful for your design and to have more understanding of the usage and performance of
this device. This circuit is the same as TEST CIRCUIT. Note that this board is not prepared to show the
recommendation of pattern and parts layout.
Circuit Diagram
RF IN
SENSE RSSI CARRIER FSK CHARGE AF
LEVEL OUT SENSE OUT SW OUT
Hi Lo
R4
V+ C6 68k
R11 C10
51 1000p
C9
1000
R6
100k
R5
100k
0.01
C7
560p
R2
68k
R3 C8
68k 3300p
20 19 18 17 16 15 14 13 12 11
LO IN
MIXER
+
-
-+
+-
BUFFER
OSC
RSSI COMP FSK COMP
RSSI
FILTER AMP
CHARGE
+
-
IF AMP
QUAD
DET
12
C1 NC
1000p
R8
51
3 C3 4
1000p
5
V+
C13
10u C2
0.1u
IF FILTER
BA
C2
Position
6
C4
0.1u
R9
51
78
+C12
10u
NC
IF IN
9 10
C5
22p
CD
V+
R1
3.3k
Note:
1. This board is designed for mixer-input type and C2 is factory-configured as follows:
C2 : in the B position
For the case of IF-input type, the position of C2 is necessary to change as follows:
C2 : in the A position
The actual position of C2 is shown in the next page.
2. External components
CF=CFWCA450KGFA-R0 (Murata manufacturing Co., Ltd.)
CD=CDBKB450KCAY75-R0 (Murata manufacturing Co., Ltd.)
Ver.2004-08-25
- 11 -
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NJM2593.PDF ] | |
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