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AS2521 Datenblatt(PDF) 4 Page - ams AG

Teilenummer AS2521
Bauteilbeschribung  Telephone Speech Circuit with Loudhearing and Handsfree
PDF  14 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS2521 Datenblatt(HTML) 4 Page - ams AG

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Preliminary
AS2520/21/20B/21B
Rev. 5.1
Page 4
May 1999
Functional Description
The AS252x contains all the voice circuits needed in
a high feature telephone instrument, i .e.:
• line adaptation (ac impedance, dc characteristics,
2/4-wire conversion, power extraction)
• handset speech circuit
• loudhearing with enhanced anti-Larsen
• handsfree with dynamic loop gain control
• switching converter
The
line
adaptation
includes
line
driver,
ac
impedance (return loss), 2 to 4 wire converter, dc
mask and power extraction circuit for extracting the
maximum dc power from the line to supply the whole
device and peripheral circuits.
The handset speech circuit consists of a transmit and
a receive path with mute, dual soft clipping and line
regulation (pin option). A volume control is provided
with squelch and loop gain compensation to improve
signal-to-noise ratio and to assure acoustic stability.
Loudhearing
and
handsfree
functions
are
also
provided. The loudhearing function includes an anti-
Larsen circuit to prevent acoustic howling.
The handsfree circuit has a novel voice control
system
which
is
virtually
independent
of
any
background noise and works in a dynamic half
duplex mode as close to full duplex as the acoustic
loop gain allows.
The switching converter is used to extract the
available power from the ring signal and provides a
4V supply voltage. This allows the same loudspeaker
to be used for loudhearing/handsfree and tone
ringing.
LINE DRIVER
IMPEDANCE
SYNTESIZER
POWER
EXTRACTION
DC
CONTROL
VOICE
&
POWER
CONTROL
VDD
TX-AGC
RX-AGC
VDD
LE
HS
TI
LO
RO
AGND
RTH
M2
M1
CI
LI
CS
LS
VDD
Vss
RI
STB
AGND
MT
MT or PD
30
Ω
L +
ZB
AS2520/21/20B/21B
MT
VPP
VPP
PD
PD
LEVEL
DETECTOR
300
Ω
SS
SWITCHING
CONVERTER
CM
VssP
LSI
VOL
LOGIC
INTERFACE
LLC
LEVEL
DETECTOR
ST-AMP
RO-AMP
LO-AMP
MI-AMP
M3
MI-AMP
HS
M4
A
PDM
INPUT
RING
Figure 2: Block Diagramme



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