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Information as of 2000-01-10
 Latest information online
TEA1097; Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer
| 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.
| 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 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 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.
| 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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TEA1097 links to the similar products page containing an overview of products that are similar in function or related to the part number(s) as listed on this page. The similar products page includes products from the same catalog tree(s) , relevant selection guides and products from the same functional category.
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