NJW1191 Ver la hoja de datos (PDF) - Japan Radio Corporation

Número de pieza

componentes Descripción

Fabricante

NJW1191

4-channel Electronic Volume with Input Selector

Japan Radio Corporation  

NJW1191

!APPLICATION CIRCUIT

C25 100µF

+

1

C1 10µF

+2

C2 1µF

3

+

C3 1µF

+4

C4 1µF

+5

C5 1µF

+6

C6 470pF

7

C7 100nF

R1 39kΩ

8

R2 4.7kΩ

C8 4.7nF

9

C9 100nF

10

R3 2.2kΩ

C10 4.7µF

+ 11

GND

VREF

MASTER

VOLUME

& LOUDNESS

TONE

CONTROL

BIAS

V+

MASTER

VOLUME

& LOUDNESS

TONE

CONTROL

32

+9V

31

C2+4 1µF

30

C23 1µF

+

29

C22

+

1µF

28

C2+1 1µF

27

C21 470pF

26

R8 39kΩ C20 100nF

25

R7 4.7kΩ

C19 4.7nF

24

C18 100nF

23

C17 4.7µF

22 +

R6 2.2kΩ

+ 12

C11 1µF

13

C12 10µF

14

+

C13 10µF

+ 15

R4 100Ω

16

FRONT

VOLUME

REAR

VOLUME

SCL

I2C BUS

INTERFACE

FRONT

VOLUME

REAR

VOLUME

SDA

21

+

C16 1µF

20

C+15 10µF

19

C+14 10µF

18

R5 100Ω

17

!APPLICATION NOTES

Pin No.

Function

Note

2

VREF

C1 can be adjusted rise and fall time of reference voltage at power on and off. Take care that the reduced C1makes

sensitive to ripple of power supply.

3 - 6, 27 -30 Inputs

The Input impedance is designed about 48k ohms. The ground line should be inserted between each input lines to

avoid cross talk.

7,8,25,26

Loudness filter

Taps

Loudness frequency can be adjusted with external parts(See page 6) . Especialy, 8 and 25 pins should be kept from

large signal lines such as digital signal lines or the other sound signal lines to avoid digitaly noise or cross talk in

Loudness mode.

9,10,11,22,23, Tone filter

24

terminals

Tone Bass and Treble cut off frequency can be adjusted with external parts(See page6). These pins should be kept

from large signal lines such as digital signal lines or the other sound signal lines to avoid the digitaly noise or cross

talk.

12,21

Tone outputs Output impedance is designed about 50 ohms.

13,20

Balance Fedar

volume inputs

Input impedance is designed about 24k ohms.

14,15,18,19

Balance Fedar

volume

Output impedance is designed about 50 ohms.

outputs

16,17

I2C control

signal ports

These terminals should be inserted resistance about 100 ohms between terminal and signal source to reduce the

digitaly noise. These lines should be kept from analog signal lines and or near by the chip to avoid digitaly noise.

Inserted ground line between analog line and digital line should be recommended.

–5–

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