參數(shù)資料
型號(hào)： AS2540Q
廠商： AUSTRIAMICROSYSTEMS AG
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： Remote Controlled Single-Chip-Telephone
中文描述： TELEPHONE MULTIFUNCTION CKT, UUC
封裝： DIE
文件頁(yè)數(shù)： 5/18頁(yè)
文件大?。?/td> 248K
代理商： AS2540Q
Data Sheet AS2540
austria
micro
systems
Revision 3.1
Page 5 of 18
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
. The t.m. voltage at the LI pin is 4.5V. The calculation
leads to the following DC resistances: 330
to 75
at line
currents from 15mA to 100mA.
2/4 wire conversion
AS2540 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.
A1=3.4/3.5
A2=-0.4
AC impedance
The ac impedance of AS2540 is set to t.m. 1000
. With
the external capacitor at CI pin it can be programmed
complex. With a parallel impedance at the LS pin it can be
programmed to 600
.
Side Tone
A good sidetone cancellation can be achieved by using the
following equation:
Z
BAL
/Z
LINE
= 10
Transmit path
The gain of the M1/M2 —> LS transmit path is set to 38dB
for ac-impedance 1000
. The input is differential with an
impedance of 25k
. The soft clip circuit limits the output
voltage at LS to 2V
p.
The attack time is 30μs/6dB and the
decay time is 20ms/6dB.
The gain of the TIT —> LS transmit path is set to 8dB for
ac-impedance 1000
. The input is single ended with an
impedance of 25k
. The soft clip circuit is not active for
this input. The dynamic range of this path is 2.5Vp at LS.
Receive path
The gain of the LS —> ROH receive path is set to 2dB for
ac-impedance 1000
. The receive input is the differential
signal of RI and STB. During DTMF dialling a MF comfort
tone is applied to ROH which is -30dB relative to the line
level. The soft clip circuit limits the output voltage at ROH
to 1V
p.
It prevents harsh distortion and acoustic shock.
The gain of the LS —> ROT receive path is set to 0dB for
ac-impedance 1000
. The receive input is the differential
signal of RI and STB. The soft clip circuit is not active for
this output.
Modescan
The DTMF-level on the line and the function of the line loss
compensation can be selected with the connection of the
MODE-pin to the keyboard matrix. The MODE-pin is
scanned once after each OFF-Hook transition.
R1
1
4 5 6
7 8 9
* 0 #
c1
C2
PIN
C1
2 3
R2
PIN
C2
PIN
C3
PIN
R1
PIN
R2
PIN
MODE
C3
C3
C2
C1
R2
R1
LLC
Dtmf Level
45mA-75mA
-6dBm
X
X
45mA-75mA
-8dBm
X
45mA-75mA
-10dBm
X
20mA-50mA
-6dBm
X
20mA-50mA
-8dBm
X
X
20mA-50mA
-10dBm
X
X
No LLC
-6dBm
X
X
No LLC
-8dBm
X
X
X
No LLC
-10dBm
X indicates connection to pin mode
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