適合新一代智能電話機，辦公電話等。

sop-40/ssop-40封裝。

speech and handsfree

description
the utc tea1098a is designed to 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 for telephony
applications. it also equipped with digital volume control for both
earphone and loudspeaker amplifiers.
features
line interface
*operating voltage down to 1.6 v .
*built-in adjustable dc voltage regulator
*transmitting amplifier usable with dynamic, magnetic , piezo-electric
or electric microphones
*receiving amplifier for dynamic, magnetic or piezo-electric earpieces
with agc for line loss compensation.
*dtmf input for confidence tone
*mute input for pulse or dtmf dialling
supplies
*provides 3.35v regulated supply for microcontrollers or dialers
* optimized power supply that depends on line current
*filtered 2.0v for electric microphone
*pd pin that can have chip power-down.
handsfree
*asymmetrical high input impedance for electreic microphone
*loudspeaker amplifier with single-ended rail-to-rail output and
externally adjustable gain
* loudspeaker amplifier with dynamic limiter and 8 steps digital
volume control
*duplex controller with signal and noise envelope monitors for both
channels and have sensitivities and switch-over and idle mode timing
adjustable.
* voice switch control have adjustable switching range and constant
sum of gain during switching