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ST5080A データシート(PDF) 4 Page - STMicroelectronics

部品番号 ST5080A
部品情報  PIAFE PROGRAMMABLE ISDN AUDIO FRONT END
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST5080A データシート(HTML) 4 Page - STMicroelectronics

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GENERAL DESCRIPTION
ST5080A PIAFE is a combined PCM CODEC/FIL-
TER device optimized for ISDN Terminals and Digi-
tal Telephone applications. This device is A-law
and Mu-law selectable and offers a number of pro-
grammable functions accessed through a serial
control channel.
Depending on mode selected, channel control is
provided by means of a separate serial channel
control MICROWIRE compatible or multiplexed
with the PCM voice data channel in a GCI com-
patible format requiring only 4 digital interface
pins. When separate serial control interface is se-
lected, PCM interface is compatible with Combo I
and Combo II families of devices such as
ETC5057/54, TS5070/71.
PIAFE is built using SGS-THOMSON’s advanced
HCMOS process.
Transmit section of PIAFE consists of an amplifier
with switchable high impedance inputs followed
by a programmable gain amplifier, an active RC
antialiasing pre-filter to provide attenuationof high
frequency noise, an 8th order switched capacitor
band pass transmit filter and an A-law/Mu-law se-
lectable compandig encoder.
Receive section consist of an A-law/Mu-law se-
lectable expanding decoder which reconstructs
the analog sampled data signal, a 3400 Hz low
pass filter with sin X/X correction followed by two
separate programmable attenuation blocks and
two power amplifiers: One can be used to drive
an earpiece, and the other to drive a 50
Ω loud-
speaker.
Programmable functions on PIAFE include a
Ring/Tone generator which provides one or two
tones and can be directed to earpiece or to loud-
speaker or alternatively a piezo transducer up to
600nF.
A separate programmable gain amplifier allows
gain control of the signal injected. Ring/Tone gen-
erator provides sinewave or squarewave signal
with precise frequencies which may be also di-
rected to the input of the Transmit amplifier for
DTMF tone generation.
An auxiliary analog input (EAIN) is also provided
to enable for example the output of an external
band limited Ring signal to the Loudspeaker.
Transmit signal may be fed back into the receive
ampifier with a programmable attenuation to pro-
vide a sidetone circuitry.
A switchable anti-accoustic feed-back system
cancels the larsen effect in speech monitoring ap-
plication.
Two additional pins are provided for insertion of
an external Handfree function in the Loudspeaker
receive path.
An output latch controlled by register program-
ming permits external device control.
PIN FUNCTIONS
Pin
Name
Description
1,2
HFI, HFO
Hands free I/Os:
These two pins can be used to insert an external Handfree
circuit such as the TEA 7540 in the receive path. HFO is an
output which provides the signal issued from output of the
receive low pass filter while HFI is a high impendance input
which is connected directly to one of the inputs of the
Loudspeaker amplifier.
3,4
VFr+,VFr–
Receive analog earpiece amplifier complementary outputs,
capable of driving load impedances between 100 and 400
Ω or
a piezo up to 150nF. These outputs can drive directly earpiece
transductor. The signal at this output can drive be the summ of:
- Receive Speech signal from DR,
- Internal Tone Generator,
- Sidetone signal.
5VCC
Positive power supply input for the digital section.
+5 V + 10%.
6,7
LS-,LS+
Receive analog loudspeaker amplifier complementary outputs,
intended for driving a Loudspeaker: 80 mW on 50
Ω load
impedance can be provided at low distorsion meeting
specifications.
Alternatively this stage can drive a piezo transducer up to
600nF. The signal at these outputs can be the sum of:
- Receive Speech signal from DR,
- Internal Tone generator,
- External input signal from EAIN input.
ST5080A
4/32


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