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Information as of 2000-01-10
 Latest information online
TEA1099H; Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer
| Description |  |
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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.
| Features | |
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Line interface
- Low DC line voltage
- Voltage regulator with adjustable DC voltage
- Symmetrical high impedance inputs (70 kW) 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.
| Datasheet | |
| Products, packages, availability and ordering | |
Please note, devices listed in the "Products, packages, availability and ordering" table marked with "WIT" are discontinued. Devices marked with "DOD" will be in the near future.
Contact your nearest sales or distributor office for the latest information on product status and availability.
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