NJM2783

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Version 7.0E

Monaural Microphone Amplifier with ALC

"GENERAL DESCRIPTION

"PACKAGE OUTLINE

The NJM2783 is a monaural microphone amplifier with

auto level control function to avoid distortion due to clipping.

The voltage gain and the limit level are adjustable by

external resistors.

It is suitable for mini component audio system, home

audio system, karaoke and others.

" FEATURES

• Operating Voltage

+2.7 to +13.0V

• Monaural Microphone Amplifier

• Auto level control (ALC) function

(Adjustable the limit level

by external resistors

200mVrms to 2Vrms)

• Adjustable the voltage gain

by external resistors

• Additional Gain Amplifier

0dB/+20dB switchable

• Built-in Buffer Amplifier

• Low Equivalent Input Noise

1

µVrms typ.

• Carefully designed to reject RF noise

• Bipolar Technology

• Package Outline

SSOP14

" BLOCK DIAGRAM

NJM2783V

100k

Detector

Bias

Microphone Amprifier

Buffer Amplifier

Additional Gain

0dB/+20dB

100k

V+

GND

VREF

SENSE

INT

GAIN SW

IN

GAIN1

BUFFIN

BUFFGAIN BUFFOUT

OUT

GAIN2

VCR

DET