NJM2550 JRC, NJM2550 Datasheet - Page 4

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

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