Hands-free
Description
INTEGRATED CIRCUITS
DATA SHEET
TEA1094; TEA1094A Hands free IC
Product specification Supersedes data of 1996 Mar 11 File under Integrated Circuits, IC03 1996 Jul 15
Philips Semiconductors
Product specification
Hands free IC
FEATURES • Low power consumption • Power-down function (TEA1094A only) • Microphone channel with: – externally adjustable gain – microphone mute function.
• Loudspeaker channel with: – externally adjustable gain – dynamic limiter to prevent distortion – rail-to-rail output stage for single-ended load drive – logarithmic volume control via linear potentiometer – loudspeaker mute function.
• Duplex controller consisting of: – signal envelope and noise envelope monitors for both channels with: externally adjustable sensitivity externally adjustable signal envelope time constant externally adjustable noise envelope time constant – decision logic with: externally adjustable switch-over timing externally adjustable idle mode timing externally adjustable dial tone detector in receive channel – voice switch control with: adjustable switching range constant sum of gain during switching constant sum of gain at different volume settings.
ORDERING INFORMATION PACKAGE TYPE NUMBER NAME TEA1094 TEA1094A TEA1094T TEA1094AT TEA1094AM DIP28 DIP24 SO28 SO24 SSOP24 DESCRIPTION plastic dual in-line package; 28 leads (600 mil) plastic dual in-line package; 24 leads (600 mil) APPLICATIONS
TEA1094; TEA1094A
• Mains, battery or line-powered telephone sets with hands-free/listening-in functions • Cordless telephones • Answering machines • Fax machines.
GENERAL DESCRIPTION The TEA1094 and TEA1094A are bipolar circuits intended for use in mains, battery or line-powered telephone sets, cordless telephones, answering machines and Fax machines.
In conjunction with a member of the TEA106X, TEA111X families of transmission circuits, the devices offer a hands-free function.
They incorporate a microphone amplifier, a loudspeaker amplifier and a duplex controller with signal a...
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