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NXP Semiconductors |
INTEGRATED CIRCUITS
DATA SHEET
TEA1098
Speech and handsfree IC
Product specification
Supersedes data of 1999 May 20
File under Integrated Circuits, IC03
1999 Oct 14
Philips Semiconductors
Speech and handsfree IC
Product specification
TEA1098
FEATURES
Line interface
• Low DC line voltage
• Voltage regulator with adjustable DC voltage
• Symmetrical high impedance inputs (70 kΩ) for
dynamic, magnetic or electret microphones
• 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
microcontrollers or diallers
• Provides filtered power supply, optimized according to
line current
• Filtered 2.0 V power supply output for electret
microphone
• PD logic input for power-down.
Handsfree
• Asymmetrical high input impedance 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).
APPLICATIONS
• Line powered telephone sets.
GENERAL DESCRIPTION
The TEA1098 is an analog bipolar circuit dedicated to
telephony applications. It includes a line interface, handset
(HS) microphone and earpiece amplifiers, handsfree (HF)
microphone and loudspeaker amplifiers and a duplex
controller with signal and noise monitors on both channels.
This IC provides a 3.35 V supply for a microcontroller or
dialler and a 2.0 V filtered voltage supply for an electret
microphone.
ORDERING INFORMATION
TYPE
NUMBER
TEA1098TV
TEA1098H
NAME
VSO40
QFP44
TEA1098UH
−
PACKAGE
DESCRIPTION
plastic very small outline package; 40 leads
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10 × 10 × 1.75 mm
bare die; on foil
VERSION
SOT158-1
SOT307-2
−
1999 Oct 14
2
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