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參數(shù)資料
| 型號： | 935264471518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE SPEECH CKT, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數(shù)： | 12/39頁 |
| 文件大?。?/td> | 205K |
| 代理商： | 935264471518 |
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1999 Apr 08
2
Philips Semiconductors
Product specication
Speech and loudspeaker amplier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
FEATURES
Line interface
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.
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 V power supply output for electret microphone
Compatible with a ringer mode
Power-Down (PD) logic input for power-down.
Loudspeaker amplier
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.
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
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.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TEA1097TV
VSO40
plastic very small outline package; 40 leads
SOT158-1
TEA1097H
QFP44
plastic quad at package; 44 leads (lead length 1.3 mm);
body 10
× 10 × 1.75 mm
SOT307-2
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