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參數(shù)資料
| 型號： | AS2523 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 英文描述： | ECONOLINE: REC3-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 3W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
| 中文描述： | 電話線接口電路和揚聲器 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AS2523 |
Data Sheet AS2523, AS2524, AS2524B
austria
micro
systems
Revision 1.12, Preliminary
Page 5 of 19
Functional Description
DC conditions
The normal operating mode is from 15mA to 100mA. An
operating mode with reduced performance is from 5mA to
15mA. In the line hold range from 0mA to 5mA the device
is in a power down mode.
The DC characteristic is determined by the voltage at LI-
pin and a 30
resistor between LI- and LS-pin. It can be
calculated by the following equation: V
LS
= V
LI
+ I
Line
*
30
. V
LI
can be programmed to be 3.5V or 4.5V.
2/4 wire conversion
AS2523/24 has built in two Wheatstone bridges with one
common ground. This provides a maximum of
independence of AC-impedance and side tone from each
other. One can adapt side tone without changing the AC-
impedance.
AC-impedance
The AC-impedance of AS2523/24 is set to t.m. 1000
.
With the external capacitor at CI-pin it can be programmed
complex. With an external resistor of approx. 1.5k
connected to the LS-pin it can be programmed to 600
.
Side Tone
A good side tone cancellation can be achieved by using the
following equation:
Z
BAL
/Z
LINE
= 10
Transmit path
The gain of the M1/M2
→
LS is set to +37dB. This gain
can be changed by programming on AS2523 from +30dB to
+45dB in 1dB steps (Register
Txgain
), on AS2524 / 24B it
is set to +37dB per default. The input is differential with an
impedance of 10k
. The soft clip circuit limits the output
voltage at LS to 2V
p.
There is LLC for this path.
The gain of the M3/M4
→
LS is set to +46dB.
This gain can be changed by programming from +39dB to
+54dB in 1dB steps on AS2523. The input is differential
with an impedance of 10k
. The soft clip circuit limits the
output voltage at LS to 2V
p
. There is no LLC for this path.
Receive path
The gain of the LS
→
RO receive path is set to +7.5dB.
This gain can be changed by programming from –7.5dB to
+7.5dB in 1dB steps (Register
Rxgain
). The receive input
is the differential signal of RI and STB. The soft clip circuit
limits the output voltage at RO to 1V
p.
It prevents harsh
distortion and acoustic shock. There is LLC for this path.
The gain of the LS
→
LO receive path is set to +32dB.
This gain can be changed by programming from +19dB to -
34dB in 1dB steps. The user can also change the gain via
Register
Handsfree receive end gain
(See section
"Handsfree"). The receive input is the differential signal of
RI and STB. The soft clip circuit limits the output voltage at
LO to 1.1V
p.
It prevents harsh distortion and acoustic
shock. There is optional LLC for this path.
Line Loss Compensation (AS2523, AS2524B)
-
-
-
When it is activated, the transmit and receive gains for
both I/O’s are decreased by 6dB at line currents from
20mA to 50mA or from 45mA to 75mA.
programmable on AS2523
not activated at AS2524
permanently activated at AS2524B
Handsfree
The handsfree function allows voice communication without
using the handset (full 2-way speaker phone). Two voice
controlled attenuators prevent acoustic coupling between
the loudspeaker and the microphone. The voice switching
circuit has three states, namely idle, transmit or receive. In
receive mode the attenuation of the receive path and the
transmit path can be controlled by Register
Handsfree
receive end gain
between 0dB and -20dB. The following
table shows how voice switching is controlled
TX_atten
Backgnd
noise
monitor
Voice
switching
speech
RX
voice switching circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS2524 | Telephone Line Interface and Speakerphone Circuit |
| AS2524B | Telephone Line Interface and Speakerphone Circuit |
| AS2525B | Single Chip Speaker Phone |
| AS2525 | Single-Chip Handsfree Phone CMOS Integrated Circuit |
| AS2534ET | Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS2523_1 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Line Interface and Speakerphone Circuit |
| AS2523_13 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Line Interface and Speakerphone Circuit |
| AS25230FLF | 制造商:TT Electronics / IRC 功能描述:AS25230FLF |
| AS25230HLF | 制造商:TT Electronics / IRC 功能描述:AS25230HLF |
| AS25230JLF | 制造商:TT Electronics / IRC 功能描述:AS25230JLF |
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