TEA1097H 查看數據表（PDF） - Philips Electronics

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产品描述 (功能)

比赛名单

TEA1097H

Speech and loudspeaker amplifie IC with auxiliary inputs/outputs and analog multiplexer

Philips Electronics 

Philips Semiconductors

Speech and loudspeaker amplifier IC with

auxiliary inputs/outputs and analog multiplexer

Product specification

TEA1097

FEATURES

Line interface

• Low DC line voltage

• Voltage regulator with adjustable DC voltage

• Symmetrical high-impedance inputs (70 kΩ) for

dynamic, magnetic or electric microphones

• Dual Tone Multi-Frequency (DTMF) input with

confidence tone on earphone and/or loudspeaker

• Receive amplifier for dynamic, magnetic or

piezo-electric earpieces (with externally adjustable gain)

• Automatic Gain Control (AGC) for true line loss

compensation.

Supplies

• Provides a strong 3.35 V regulated supply for

microcontroller or dialler

• Provides filtered power supply, optimized according to

line current and compatible with external voltage or

current sources

• Filtered 2 V power supply output for electret microphone

• Compatible with a ringer mode

• Power-Down (PD) logic input for power-down.

Loudspeaker amplifier

• Single-ended rail-to-rail output

• Externally adjustable gain

• Dynamic limiter to prevent distortion

• Logarithmic volume control via linear potentiometer.

Auxiliary interfaces

• Asymmetrical high-impedance input for electret

microphone.

• General purpose auxiliary output for transmit and

receive

• Auxiliary transmit input with high signal level capability

dedicated to line transmission

• Auxiliary receive input with high signal level capability

• Integrated multiplexer for channels selection.

APPLICATIONS

• Telephone answering machines

• Telephones with digital handsfree

• Line powered telephone sets

• Cordless telephones

• Fax machines.

GENERAL DESCRIPTION

The TEA1097 is an analog bipolar circuit dedicated for

telephone applications. It includes a line interface, handset

microphone and earpiece amplifiers, base microphone

and loudspeaker amplifiers, some specific auxiliary

Inputs/Outputs (I/Os) and an analog multiplexer to enable

the right transmit and/or receive channels. The multiplexer

is controlled by a logic circuitry decoding four logic inputs

provided by a microcontroller. Twelve different application

modes have been defined and can be accessed by

selecting the right logic inputs.

This IC can be supplied by the line and/or by the mains if

available (in a cordless telephone or a telephone

answering machine for example). It provides a 3.35 V

supply for a microcontroller or dialler and a 2 V filtered

voltage supply for electret microphones. The IC is

designed to facilitate the use of the loudspeaker amplifier

during ringing phase.

ORDERING INFORMATION

TYPE

NUMBER

TEA1097TV

TEA1097H

NAME

VSO40

QFP44

PACKAGE

DESCRIPTION

plastic very small outline package; 40 leads

plastic quad flat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

VERSION

SOT158-1

SOT307-2

1999 Apr 08

2

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