NJM2550 查看數據表（PDF） - Japan Radio Corporation
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产品描述 (功能)
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NJM2550 Datasheet PDF : 15 Pages
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NJM2550
EVALUATION BOARD
This evaluation board may be useful for your design and to have more understanding of the usage and
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.
Circuit Diagram
RSSI
OUT
R21 C22
7.5k 1000p
16
SW1
CHARGE
SWITCH
to V+
COMP
OUT
R20
R18
R17
100k
100k
100k
C19
+10u
15
14
13
12
11
AMP
OUT
C15
C136300pR14 R13
R11
68k
330p 68k 68k C12
10
9
1000p
++
--
COMP
+
- CHARGE
BUFF
AMP
IC1
NJM2550
RSSI
IF AMP
QUAD DET
1
2
3
4
5
6
7
8
C3
C5
to V+
C8
R2 C1
0.01u 0.01u
R50 2p
33k 30p
RSSI
V+
REF
R4
51
IF IN
+C6 C7
10u 0.1u
R10
1k
to
V+
AF
T9 : 4165-T070
OUT
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.
• f i f =10.7 MHz (factory-configured)
T9
: IF transformer for detection, 4165-T070 (Sumida corporation)
R10 : 1kΩ
R50 : open
• f i f =50MHz
T9
: IF transformer for detection, 2261-T080 (Sumida corporation)
R10 : 1kΩ
R50 : 7.5 kΩ
2. This board is designed for fdev=±100kHz. For fdev=±10kHz, please refer to the values shown below.
• fdev=±100kHz (factory-configured)
Tquard related values : L=4400nH, Q=80
Rquad=1kΩ
Ver.2006-02-24
-9-
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