TEA1098 Philips Semiconductors, TEA1098 Datasheet - Page 2

• Manufacturer Part Number: TEA1098
• Description: Speech and handsfree IC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
Line interface
Supplies
Handsfree
ORDERING INFORMATION
1999 Oct 14
TEA1098TV
TEA1098H
TEA1098UH
Low DC line voltage
Voltage regulator with adjustable DC voltage
Symmetrical high impedance inputs (70 k ) 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.
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.
Asymmetrical high input impedance for electret
microphone
Loudspeaker amplifier with single-ended rail-to-rail
output and externally adjustable gain
Speech and handsfree IC
NUMBER
TYPE
VSO40
QFP44
NAME
plastic very small outline package; 40 leads
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
bare die; on foil
10
1.75 mm
2
DESCRIPTION
APPLICATIONS
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.
PACKAGE
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
– Decision logic (with adjustable switch-over and Idle
– Voice switch control (with adjustable switching range
Line powered telephone sets.
channels (with adjustable sensitivities and timing)
mode timing)
and constant sum of gain during switching).
Product specification
TEA1098
SOT158-1
SOT307-2
VERSION