NJM2550 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJM2550

10.7MHz INPUT FM IF DEMODULATOR

Japan Radio Corporation  

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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