NJM2550 JRC, NJM2550 Datasheet - Page 9

• Manufacturer Part Number: NJM2550
• Description: FM IF Demodulator IC / SSOP16
• Manufacturer: JRC

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Ver.2006-02-24
EVALUATION BOARD
performance of this device. The circuit diagram and test condition of this board is the same as TEST CIRCUIT. Note
that this board is not prepared to show you the recommendation of pattern and parts layout.
This evaluation board may be useful for your design and to have more understanding of the usage and
Circuit Diagram
Note:
1. This board is designed for f i f =10.7MHz. For f i f =50MHz, please change T9 ,R10, and R50 as follows.
2. This board is designed for fdev=±100kHz. For fdev=±10kHz, please refer to the values shown below.
V
+
7.5k
R21
33k
R2
RSSI
OUT
1000p
f i f =10.7 MHz (factory-configured)
T9
R10
R50
f i f =50MHz
T9
R10
R50
fdev=±100kHz (factory-configured)
Tquard related values : L=4400nH, Q=80
C22
30p
C1
16
1
RSSI
RSSI
REF
CHARGE
SWITCH
: IF transformer for detection, 4165-T070 (Sumida corporation)
: IF transformer for detection, 2261-T080 (Sumida corporation)
: 1kΩ
: open
: 1kΩ
: 7.5 kΩ
SW1
15
2
to V
100k
R20
R4
51
14
+
3
0.01u
C3
IF IN
COMP
OUT
+
+
+
-
-
-
13
4
COMP
100k
R18
0.01u
CHARGE
C5
+
C19
10u
IF AMP
12
5
+
10u
100k
C6
R17
to V
0.1u
C7
+
11
6
Rquad=1kΩ
NJM2550
R50
IC1
T9 : 4165-T070
C8
2p
10
7
AMP
OUT
QUAD DET
330p
C16
R10
1k
3300p
C15
9
8
to V
BUFF
AMP
R14
68k
+
R13
68k
NJM2550
1000p
OUT
AF
C12
R11
68k
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