NJM2775A

PRELIMINARY

- 1 -

PRE&HI-POWER AMPLIFIER with ALC for PORTABLE TAPE RECORDER

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s GENERAL DESCRIPTION

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s PACKAGE OUTLINE

The NJM2775A is a pre&power amplifier with ALC

designed for micro and compact cassette recorders.

It contains pre-amplifier, ALC circuit, power amplifiers,

and ripple filter. The pre-amplifier amplifies the signal

come from magnetic head. The ALC circuit limits the

input signal to optimize level in recording. The power

amplifiers drive a speaker in play back and the magnetic

head in recording. The ripple filter stabilizing the supply

voltage to the internal pre-amplifier and an external

condenser microphone.

The NJM2775A improves high output power compared

with the NJM2128.

It is suitable for portable tape recorder, and other

portable playing back and recording recorder items.

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s FEATURES

qOperating Voltage

V

qOperating Current

9mA typ.

qOutput Power

350mW typ. at V

Ω,THD=10%

qAutomatic Level Control

200mVrms typ., at f=1kHz

(ALC) Limit Level

qRipple Filter R.R.

47dB typ., at f=200Hz,C=47

µF

(Ripple Rejection)

qBipolar Technology

qPackage Outline

DMP16

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s PIN CONFIGURATION

1

2

3

4

16

15

14

13

POW-INA

POW+INA

PREOUT

PGND

PRE-IN

12

PRE

AMP

5

11

PRE+IN

10

V

+

POW-INB

ALCIN

POWOUTA

POWOUTB

SGND

8

9

POWER

AMPA

RIPPLE

FILTER

ALC

POWER

AMPB

RFIN

TC

NJM2775AM

PIN FUNCTION

1.PRE +IN

2.SGND

3.POW +1NA

4.POW -INA

5.POW -INB

6.POW +INB

7.REFOUT

8.REFIN

9.ALCIN

10.TC

11.POW OUTB

12.PGND

13. V

+

14.POW OUTA

15.PREOUT

16.PRE -IN