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NJU7087

Sound Enhancement Processor For Telephone

Japan Radio Corporation  

NJU7087

PRELIMINARY

Sound Enhancement Processor For Telephone

sGENERAL 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.

sPACKAGE OUTLINE

sFEATURES

qOperating Voltage

qLow Operating Current

qLow Output Noise

qBypass Gain

qAdjustable Boost Level(High)

qPackage Outline

sPIN CONFIGURATION

(VDD=2.4 to 5.5V)

(2mA typ.at VDD=3V)

(31.6µVrms typ. at BBE ON)

(0dB typ.)

(SSOP16)

NJU7087

VDD

INPUT

(NC)

HPF

CR1

BPF

CR2

LPF

GND

VREF

BBE

OUTPUT

CR5

CR4

BBEOUT

CR3

No. SYMBOL FUNCTION

1 VDD

Power Supply

2 INPUT Signal Input

3 (NC)

(No Connected)

4 HPF

HPF Output

5 CR1

Filter

6 BPF

BPF Output

7 CR2

Filter

8 LPF

LPF Output

No. SYMBOL FUNCTION

9 CR3

Filter

10 BBEOUT BBE Output

11 CR4

Filter

12 CR5

Filter

13 OUTPUT Signal Output

14 BBE

BBE ON/OFF

15 VREF

Reference Voltage

16 GND

GND

sBLOCK DIAGRAM

VDD

HPF CR1 BPF CR2 LPF CR3 BBEOUT CR4 CR5

INPUT

OUTPUT

GND BBE

VREF

-1-

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