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UBA1707

Cordless telephone, answering machine line interface

Philips Electronics 

Philips Semiconductors

Cordless telephone, answering machine

line interface

Product specification

UBA1707

FEATURES

Line interface

• Low DC line voltage; operates down to 1.2 V (excluding

polarity guard)

• Voltage regulator with adjustable DC voltage

• DC mask for voltage or current regulation (CTR 21)

• Line current limitation for protection

• Electronic hook switch control input

• Transmit amplifier with:

– Symmetrical inputs

– Fixed gain

– Large signals handling capability.

• Receive amplifier with fixed gain

• Transmit and receive amplifiers AGC for line loss

compensation.

• AGC:

– On/off

– Slope

– Istart line current.

• Auxiliary amplifier mute function

• Loudspeaker channel:

– Input selection

– Volume setting

– Dynamic limiter inhibition

– Power-down mode.

• General purpose switches state

• Global power-down mode.

Supply

Operates with external supply voltage from 3.0 to 5.5 V.

Auxiliary amplifier

• Fixed gain.

Loudspeaker channel

• Dual inputs

• Rail-to-rail output stage for single-ended load drive

• High output current capability

• Dynamic limiter to prevent distortion

• Digital volume control

• Fixed maximum gain.

General purpose switches

• Three switches with open-collector.

3-wires serial bus interface

Allows to control:

• DC mask (voltage or current regulation)

• Receive amplifier mute function

APPLICATIONS

• Cordless base stations

• Answering machines

• Mains or battery-powered telephone sets.

GENERAL DESCRIPTION

The UBA1707 is a BiCMOS integrated circuit intended for

use in mains-powered telecom terminals. It performs all

speech and line interface functions, DC mask for voltage

or current regulation and electronic hook switch control.

The device includes an auxiliary amplifier, a loudspeaker

channel and general purpose switches.

Most of the characteristics are programmable via a 3-wire

serial bus interface.

ORDERING INFORMATION

TYPE

NUMBER

UBA1707T

UBA1707TS

PACKAGE

NAME

DESCRIPTION

SO28 plastic small outline package; 28 leads; body width 7.5 mm

SSOP28 plastic shrink small outline package; 28 leads; body width 5.3 mm

VERSION

SOT136-1

SOT341-1

1999 Feb 17

2

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