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參數(shù)資料
| 型號： | AS2522B-T |
| 廠商： | ams |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE INTERFACE TELEPH 32-TQFP |
| 標準包裝： | 2,000 |
| 系列： | * |
Data Sheet AS2522B
austriamicrosystems
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: VLS = VLI + ILine *
30
. VLI 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:
ZBAL/ZLINE = 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 2Vp. 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 2Vp. 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 1Vp. 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
1Vp. 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
ams
AG
Technical
content
still
valid
相關PDF資料 |
PDF描述 |
|---|---|
| AS2522B | IC LINE INTERFACE TELEPH 32-TQFP |
| AS2524-T | IC LINE INTERFACE/SPKRPH 28-SOIC |
| AS2524 | IC LINE INTERFACE/SPKRPH 28-SOIC |
| AS2533 | IC TELEPHONE CMOS MULTIFU 28SOIC |
| AS2536 | IC TELEPHONE CMOS MULTIFU 28SOIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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)品培訓模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標準包裝: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 |
| 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 |
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