发明名称 |
Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with programmable current limiting |
摘要 |
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.
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申请公布号 |
US6498825(B1) |
申请公布日期 |
2002.12.24 |
申请号 |
US19980098489 |
申请日期 |
1998.06.16 |
申请人 |
SILICON LABORATORIES INC. |
发明人 |
DUPUIS TIMOTHY J.;TUTTLE GEORGE TYSON;SCOTT JEFFREY W.;SOOCH NAVDEEP S.;WELLAND DAVID R. |
分类号 |
H04L7/033;H04L25/06;H04M11/06;H04M19/00;(IPC1-7):H04B15/00 |
主分类号 |
H04L7/033 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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