NJM2591

Ver.2004-08-25

-7-

EVALUATION BOARD

The evaluation PC board is useful for your design and is intended to have more understanding of the usage and

performance of this device. The circuit of this board is the same as TEST CIRCUIT. For other electrical conditions, it

should be necessary to reconsider each value of external components.

Note that this board is not prepared to show the recommendation of pattern and parts layout.

Circuit Diagram

Note

R8 : open

R9 : chip resistor of 0Ω

For the case of IF-input type, please change the position of the chip resistor of 0Ω as follows ;

R8 : chip resistor of 0Ω

R9 : open

2.

External components

CF=CFWCA450KGFA-R0 (Murata)

CD=CDBCB450KCAY70-R0 (Murata)

16

15

14

13

12

11

10

9

1

2

4

3

5

6

7

8

OSC

RSSI

IF AMP

QUAD

DET

LPF

NOISE

COMP

NOISE

AMP

FILTER

AMP

BUFFER

MIXER

V

+

V

+

NOISE

REC

LOCAL

IN

NOISE

DET

RSSI

R4

2.7k

C11

10u

C9

33p

C6

1000p

C7

0.1u

21.7MHz

C8

1000p

R7

51

31kHz

R2

5.6k

C2

0.1u

450kHz

R9

Short

or

Open

C5

0.1u

C10

10u

C1

1000p

0.3 to 3kHz

AUDIO

OUT

CF

NOISE DET

CD

AF

OUT

MIX

IN

R6

100

R8

Open

or

Short

R5

51

IF IN

C3

220

C4

220

R1

150

R3

10k

NOISE IN

21.25MHz