tea1097h NXP Semiconductors, tea1097h Datasheet - Page 2

• Manufacturer Part Number: tea1097h
• Description: Speech And Loudspeaker Amplifier Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
Line interface
Supplies
Loudspeaker amplifier
Auxiliary interfaces
ORDERING INFORMATION
1999 Apr 08
TEA1097TV
TEA1097H
Low DC line voltage
Voltage regulator with adjustable DC voltage
Symmetrical high-impedance inputs (70 k ) 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.
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 V power supply output for electret microphone
Compatible with a ringer mode
Power-Down (PD) logic input for power-down.
Single-ended rail-to-rail output
Externally adjustable gain
Dynamic limiter to prevent distortion
Logarithmic volume control via linear potentiometer.
Asymmetrical high-impedance input for electret
microphone.
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
NUMBER
TYPE
VSO40
QFP44
NAME
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
plastic very small outline package; 40 leads
10
1.75 mm
2
DESCRIPTION
APPLICATIONS
GENERAL 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.
PACKAGE
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.
Telephone answering machines
Telephones with digital handsfree
Line powered telephone sets
Cordless telephones
Fax machines.
Product specification
TEA1097
SOT158-1
SOT307-2
VERSION