NJM2550 Datasheet, PDF (10/15 Pages) New Japan Radio – 10.7MHz INPUT FM IF DEMODULATOR

NJM2550
• fdev=±10kHz
Tquard related values :L=4400nH, Q=110
Rquad=30kΩ
3. The external resistors connected to1pin and 16pin have the same thermal coefficient. By changing these
thermal coefficients, RSSI thermal characteristics can be changed.
4. This board is designed to supply voltage to CHARGE SWITCH, the pull-up of COMP OUT, and the
quadrature circuit from the common power source. NJM2550 permits each of CHARGE SWITCH and
pull-up of COMP OUT to have another power source within the limit of the rated power supply voltage.
Note that the voltage supplied to the quadrature circuit should be the same as the voltage supplied to pin5.
5. List of Components
Item
Resistor
Number
R2
R4
R10
R11
R13
R14
R17
R18
R20
R21
R50
value
33k
51
1k
68k
68k
68k
100k
100k
100k
7.5k
open
Item
Capacitor
Number
C1
C3
C5
C6
C7
C8
C12
C15
C16
C19
C11
value
30p
0.01u
0.01u
10u
0.1u
2p
1000p
3300p
330p
10u
1000p
IC
Switch
Transformer
IC1
SW1
T9
NJM2550
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4165-T070
Ver.2006-02-24
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