Datasheet > NJW1128

NJW1128

更新时间： 2024-11-06 06:00:59

品牌	Logo	应用领域
NJRC		放大器
页数	文件大小	规格书
13页	252K
描述
Voice Switched Speakerphone Circuit with Speaker Amplifier

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NJW1128 数据手册

NJW1128

Voice Switched Speakerphone Circuit

with Speaker Amplifier

! GENERAL DESCRIPTION

! PACKAGE OUTLINE

The NJW1128 is a Voice Switched Speakerphone Circuit. It includes all of functions

processing a high quality hands–free speakerphone system, such as the necessary

amplifiers ( Mic , Receive ,Line, Speaker ), attenuators, level detectors functions.

The NJW1128 is controllable independently power-down of the speaker amplifier and

the entire IC excluding the speaker amplifier.

All external capacitors are sufficient small so that ceramic capacitors are applied.

NJW1128FR3

! APPLICATION

•Video Door Phone

•Conference System

•Wireless Application

•Security System

! FEATURES

● Operating voltage range

● Attenuator gain range between Transmit and Receive

● Speaker amplifier

3.9 to 5.5V

52dB

● Microphone amplifier with mute function

● Force to Receive, Transmit, or Idle modes

● Mode –watching monitor

● Background noise monitor for each path

● 4-point signal sensing

● Chip disable Pin powers down the entire IC excluding

the speaker amplifier

● Speaker switch Pin power down the speaker amplifier

● Microphone and Receive Amplifiers pinned out for flexibility

● Package Outline

LQFP48-R3

! BLOCK DIAGRAM

C10 C11

100n 100n 5.1k

C8 R4

100n 3k

300k

10 0n

51k

Microphone

Line Out

5.1k

CfL

MICOUT

M ICIN

TLI2

TLI1 TXO

LII

LiO-

LiO+

SPV⁺

C22

MUT

V+

GND :ACTIVE

3 00k

SPV⁺

V⁺

:MUTE

C12

Tx Atten uato r

-1

M ic

VREF

V⁺

VREF

Am plif ier

L ine Amplifier

Monitor

M UT

100n

V⁺

:Recive

Level

Detector

TLO2

RL O2

GND :Trensmit

Open :idle

V⁺

100n

RTSW

CPR

Background

Attenuator

Control

Backgrou nd

No iseM onitor

C21

NoiseMon itor

CPT

C20

100 n

C20

L evel

TLO1

RLO1

BIAS

Detector

VREF

C19

100 n

Speaker Ampl ifier

V+ :ACTIVE

GND :Power Down

300 k

Receiv e

Ampli fier

SPGND

GND

V⁺

SPS

Rx Attenuator

-1

VREF

1.2

SPSW

V+ :ACTIVE

GND :Power Down

V⁺

300 k

RLI1

SPO+

SPO-

CfS

SPI

RL I2

VLC

RX O

R13

5.1k

C16

C15

R15

5. 1k

R14

5.1 k

R12

5.1k

10 0n

100n

R_VLC

Recive In

R10

51 k

R11 C13 C14

5.1k 10 0n 100n

CfR

Speaker

Ver.1.4

– 1 –

12 3 4 5 6 7...13

中文翻译

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