NJM2550 View Datasheet(PDF) - Japan Radio Corporation
Part Name
Description
MFG CO.
NJM2550 Datasheet PDF : 15 Pages
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NJM2550
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”. This
test circuit includes an electrical switch that should be in the suitable position for the measurement of each
parameter.
Circuit Diagram
RSSI
OUT
CHARGE
SWITCH V+
COMP
OUT
1000p
7.5k
100k
100k 100k
10u
+
16
15
14
13
12
11
++
--
COMP
+
- CHARGE
RSSI
IF AMP
AMP
OUT
3300p
68k
330p
10
9
68k 68k
1000p
BUFF
AMP
QUAD DET
1
2
33k 30p
RSSI
REF
3
0.01u
51
IF
IN
4
0.01u
5
6
7
2p
V+ R50
+
10u 0.1u
Tquad
8
R10
1k
V+
AF
OUT
External Components
• f i f =10.7 MHz
Tquad : IF transformer for detection, 4165-T070 (Sumida corporation)
R10 : 1kΩ
R50 : open
• f i f =50MHz
Tquad : IF transformer for detection, 2261-T080 (Sumida corporation)
R10 : 1kΩ
R50 : 7.5 kΩ
• The external resistors connected to1pin and 16pin should have the same thermal coefficient.
Ver.2006-02-24
-4-
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