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NJW1124

Voice Switched Speakerphone circuit

Japan Radio Corporation  

NJW1124

Voice Switched Speakerphone circuit

! GENERAL DESCRIPTION

The NJW1124 is a Voice Switched Speakerphone Circuit.

NJW1124 includes all of functions processing a high quality hands–free

speakerphone system, such as the necessary amplifiers ( Microphone ,

Receive ,Line), attenuators, level detectors functions.

All external capacitors are sufficient small so that ceramic capacitors are

applied.

! APPLICATION

•Video Door Phone

•Conference System

•Wireless Application

•Security System

! FEATURES

• Operating voltage range

• Force to Receive, Transmit, or Idle modes

• Mode –watching monitor

• Attenuator gain range between Transmit and Receive

• Microphone amplifier with mute function

• Background noise monitor for each path

• Volume control range

• 4-point signal sensing

• Microphone and Receive Amplifiers pinned out for flexibility

• Package Outline

2.9 to 4.5V

52dB

40dB

SSOP32

! PACKAGE OUTLINE

NJW1124V

! BLOCK DIAGRAM

Microphone

C6 R2

100n 5.1k

R3

C7

51k

100n

M CI

MCO

R4

51k

TLI2

C8 C9 R6

100n 100n 5.1k

R5

10k

TLI1 TXO

LII

R7

51k

C10

LiO-

LiO+

Line Out

V+

V+

R1

300k

C1

1µ

C3

470n

C4

470n

C2

1u

M UT

TLO2

RLO2

CPT

C23

1µ

VREF

VREF2

VREF

Mic

Amplifier

Tx Attenuator

Lev el

Detector

Background

NoiseMonitor

Attenuator

Control

VREF

-1

Line Amplifier

Background

NoiseMonitor

Lev el

Detector

C11

V+

1µ

M onit or

CT

RTSW

C5

1µ

V+

C22

CPR

1µ

TLO1

RLO1

C20

470n

C21

470n

BIAS

IC1

NJW1124

Rx Attenuator

1.2µ A

Receive

Amplifier

GND

VREF

V+

R10

15k

C15

1µ

Speaker

IC2

NJU7084

Power Amplifier

5.0V

+ C16

10µ C13

1µ

RXO RLI2

R11

C17 10k

100n

C14 1 µ

R9

22k

R8 C12

11k 100n

VLC

R12

51k

RVLC

RLI1 FO

C18

100n

R13

5. 1k

FI

R14 C19

5.1k 100n

Recive In

–1–

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