NJU72014RB2 查看數據表（PDF） - Japan Radio Corporation

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NJU72014RB2

2Vrms Ground Referenced Stereo Line Amplifier with LPF

Japan Radio Corporation  

NJU72014

„ APPLICATION NOTE

The NJU72014 is an audio line amplifier that eliminates the need for external dc-blocking output capacitors.

The NJU72014 has built-in pop suppression circuitry to eliminate disturbing pop noise during power-on,

power-off and mute-control.

1. Operating Principle

The NJU72014 has the built-in non-inverted input operational amplifiers, voltage inverter, and pop noise

suppression circuitry (Fig.1).

The voltage inverter for NJU72014 eliminates the need for external dc-blocking output capacitors. The pop

suppression circuitry for NJU72014 eliminates the pop noise during power-on, power-off and mute-control.

R1

1uF 1kΩ

C2

820pF

C3

V+

10uF

C11

INL

1

INR

10

2 OUTL

Mute-Tr

Mute-Tr

OUTR 9

3 V+

Pop Noise

Suppression

GND 8

R3

1kΩ 1uF

820pF C8

C9

4 CP

Bias

1uF

Charge

C4

Pump

5 CN

MUTE 7

V-

6

10uF

C6

*1)

*1) Connect a zener diode between V- terminal[6pin] and GND terminal[8pin] to prevent connecting V- terminal[6pin] and V+

terminal[3pin].

Fig.1 The NJU72014 functional block diagram

–4–

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