參數(shù)資料
型號(hào)： AS2522BQ
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： 無繩電話/電話
英文描述： Telephone Line Interface and Speakerphone Circuit
中文描述： SPEAKER PHONE CIRCUIT, PQFP32
封裝： 7 X 7 MM, PLASTIC, TQFP-32
文件頁(yè)數(shù)： 5/19頁(yè)
文件大?。?/td> 365K
代理商： AS2522BQ
Data Sheet AS2522B
austria
micro
systems
Revision 3.4
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
AS2522 has a built-in dual Wheatstone bridge 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 AS2522 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 from +30dB to +45dB in
1dB steps (Register
Txgain
). 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. 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 +1dB.
This gain can be changed by programming from -6dB to
+9dB 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
→
LO1/LO2 receive path is set to
+29dB. This gain can be changed by programming from
+22dB to -37dB in 1dB steps. The user can also change
the gain via Register
VOL
(See section "Handsfree"). The
receive input is the differential signal of RI and STB. The
soft clip circuit limits the output voltage at LO1 of LO2 to
1V
p.
It prevents harsh distortion and acoustic shock. There
is optional LLC for this path.
Line Loss Compensation
The line loss compensation is programmable (Register
0x0C
). 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.
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
VOL
between
0dB and -20dB. The following table shows how voice
switching is controlled
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AS2522BT 制造商:ams 功能描述:AS Series 3 to 5 V Telephone Line Interface and Speakerphone Circuit - TQFP-32
AS2522B-T 功能描述:IC LINE INTERFACE TELEPH 32-TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:*
AS2522B-Z 制造商:ams 功能描述:
AS2523 功能描述:IC LINE INTERFACE/SPKRPH 28-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 電信 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:*
AS2523_1 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Telephone Line Interface and Speakerphone Circuit
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