Datasheet > NJW1124

NJW1124

更新时间： 2024-11-18 06:00:55

品牌	Logo	应用领域
NJRC		/
页数	文件大小	规格书
29页	477K
描述
Voice Switched Speakerphone circuit

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中文翻译

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数据手册

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NJW1124 数据手册

NJW1124

Voice Switched Speakerphone circuit

! GENERAL DESCRIPTION

! PACKAGE OUTLINE

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.

NJW1124V

! APPLICATION

•Video Door Phone

•Conference System

•Wireless Application

•Security System

! FEATURES

• Operating voltage range

2.9 to 4.5V

• 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

52dB

40dB

• 4-point signal sensing

• Microphone and Receive Amplifiers pinned out for flexibility

• Package Outline

SSOP32

! BLOCK DIAGRAM

C6 R2

100n 5.1k

51k

100n

5.1k

51k

100n 100n

Microphone

Line Out

51k

TLI2

C10

10k

MCO

MCI

TLI1 TXO

LII

LiO-

LiO+

V⁺

300k

V⁺

C11

Tx Attenuator

-1

Mic

Amplifier

VREF

V⁺

VREF

Line Amplifier

Monitor

MUT

470n

Level

Detector

TLO2

RLO2

V⁺

470n

RTSW

CPR

Background

NoiseMonitor

Attenuator

Control

Background

NoiseMonitor

C22

CPT

C20

470n

Level

Detector

TLO1

RLO1

C21

470n

C23

BIAS

VREF

Receive

Amplifier

IC1

NJW1124

VREF2

Rx Attenuator

1.2

GND

VREF

VLC

RLI1 FO

RXO RLI2

R11

C17

100n

R12

51k

5.0V

R10

15k

V⁺

C18

R13

5.1k

R14 C19

5.1k 100n

100n

C16

R_VLC

10k

Recive In

C15

C13

1 µ

Speaker

C14

IC2

1 µ

NJU7084

22k

C12

Power Amplifier

11k 100n

– 1 –

12 3 4 5 6 7...29

中文翻译

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