U4082B-MFL

更新时间： 2024-11-28 13:15:07

品牌	Logo	应用领域
爱特美尔 - ATMEL		电信集成电路光电二极管
页数	文件大小	规格书
30页	541K
描述
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数据手册

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U4082B-MFL 数据手册

Features

•

Low-voltage Operation 3V to 6.5V

Attenuator Gain Range Between Transmit and Receive: 52 dB

Four-point Signal Sensing for Improved Sensitivity

Monitoring System for Background Noise Level

Adjustable Microphone Amplifier Gain

Mute Function

Chip Disable for Active/Standby Operation

On-board Filter

Low-voltage

Voice-switched

IC for

Hands-free

Operation

Dial Tone Detector

Compatible with U4083B Speaker Amplifier

Benefits

•

Fast Channel Switching Allows Quasi-duplex Operation

Proper Operation in Noisy Surroundings

1. Description

The low-voltage voice-switched speakerphone circuit, U4082B, incorporates a wide

range of functions. The versatility of the device is further enhanced by giving access to

internal circuit points. The block diagram (see Figure 1-1) shows amplifiers, level

detectors, transmit and receive attenuators operating in complementary functions,

background noise monitors, chip disable, dial tone detector and mute function. Due to

low-voltage operation, the device can be operated either by a low supply or via a tele-

phone line requiring 5.5 mA typically. Stand-alone operation is enabled by a coupling

transformer (Tip and Ring) or in conjunction with a handset speech network, as shown

in Figure 1-2 on page 2.

U4082B

Figure 1-1. Block Diagram

MIC

11 MICO 10 17 TLI2

HTI

HTO-

T Attenuator

V_S

HTO+

V_B

MUTE

V_B

CPR

AGC

Background

Noise Monitor

Background

Noise Monitor

CPT

TLI1

Level

Detectors

Level

Detectors

TLO2

Attenuator

Control

RLO1

TLO1

RLO2

Dial Tone

Detector

V_S

U4082B

V_B

GND

Filter

400Ω

R Attenuator

RLI2

22 21

RLI1

1 PD

V_B

C_T

RECO

VCI

Rev. 4743D–CORD–03/06

12 3 4 5 6 7...30

中文翻译

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