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NJU7087

PRELIMINARY

Sound Enhancement Processor For Telephone

s

GENERAL DESCRIPTION

The

NJU7087

is a Sound Enhancement Processor for

telephone, using a low power C-MOS technology. Sound

enhancement and LPF circuit improve quality of conversation

without increasing noise.

The

NJU7087

is suitable for limited band-width application,

such as telephone, and answer phone.

s

PACKAGE OUTLINE

s

FEATURES

qOperating

Voltage

qLow

Operating Current

qLow

Output Noise

qBypass

Gain

qAdjustable

Boost Level(High)

qPackage

Outline

s

PIN CONFIGURATION

NJU7087

(V

DD

=2.4 to 5.5V)

(2mA typ.at VDD=3V)

(31.6碌Vrms typ. at BBE ON)

(0dB typ.)

(SSOP16)

VDD

INPUT

(NC)

HPF

CR1

BPF

CR2

LPF

GND

VREF

BBE

OUTPUT

CR5

CR4

BBEOUT

CR3

No.

1

2

3

4

5

6

7

8

SYMBOL

VDD

INPUT

(NC)

HPF

CR1

BPF

CR2

LPF

FUNCTION

Power Supply

Signal Input

(No Connected)

HPF Output

Filter

BPF Output

Filter

LPF Output

No.

9

10

11

12

13

14

15

16

SYMBOL

CR3

BBEOUT

CR4

CR5

OUTPUT

BBE

VREF

GND

FUNCTION

Filter

BBE Output

Filter

Filter

Signal Output

BBE ON/OFF

Reference Voltage

GND

s

BLOCK DIAGRAM

NJU7087

VDD

HPF

CR1

BPF

CR2

LPF CR3 BBEOUT CR4 CR5

INPUT

OUTPUT

GND

BBE

VREF

-1-

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