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TEA1099H

Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC with auxiliary

inputs/outputs and analog multiplexer

Product specification

TEA1099H

FEATURES

Line interface

• Low DC line voltage

• Voltage regulator with adjustable DC voltage

• Symmetrical high impedance inputs (70 kΩ) for

dynamic, magnetic or electret 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)

• AGC: Automatic Gain Control 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 2.0 V power supply output for electret

microphone

• Compatible with a ringer mode

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

Handsfree

• Asymmetrical high-impedance input for electret

microphone

• Loudspeaker amplifier with single-ended rail-to-rail

output and externally adjustable gain

• Dynamic limiter on loudspeaker amplifier to prevent

distortion

• Logarithmic volume control on loudspeaker amplifier via

linear potentiometer

• Duplex controller consisting of:

– Signal and noise envelope monitors for both

channels (with adjustable sensitivities and timing)

– Decision logic (with adjustable switch-over and Idle

mode timing)

– Voice switch control (with adjustable switching range

and constant sum of gain during switching).

Auxiliary interfaces

• General auxiliary output for transmit and receive

purposes

• 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

• Line powered telephone sets

• Cordless telephones

• Fax machines

• Answering machines.

GENERAL DESCRIPTION

The TEA1099H is an analog bipolar circuit dedicated for

telephone applications. It includes a line interface, handset

(HS) microphone and earpiece amplifiers, handsfree (HF)

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 circuit which

decodes four logic inputs provided by a microcontroller.

Thirteen different application modes have been defined

and can be accessed by selecting the right logic inputs.

An application mode is a special combination of transmit

and receive channels required by telephone applications.

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

available (in a cordless telephone or an answering

machine for example). It provides a 3.35 V supply for a

microcontroller or dialler and a 2.0 V filtered voltage supply

for an electret microphone. The IC is designed to facilitate

the use of the loudspeaker amplifier during ringing phase.

1999 Apr 08

2

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