求叫：模拟语音信号在电话线中传输的参数？...

要求摘机后，在电话线中传输模拟语音。 请教，在电话线中，对语音模拟信号电平、功率一般有什么要求？

Absolute Maximum Ratings (Note 1) Thermal Information Supply Voltage (VB-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-60 to 0.5V (VB+) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5 to 15V (VB+ - VB-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75V Relay Drive Voltage (VRD) . . . . . . . . . . . . . . . . . . . . . . . .-0.5 to 15V Operating Conditions Relay Driver Voltage (VRD) . . . . . . . . . . . . . . . . . . . . . . . . .5V to 12V Positive Supply Voltage (VB+) . . . 4.75V to 5.25V or 10.8V to 13.2V Negative Supply Voltage (VB-) . . . . . . . . . . . . . . . . . . . -42V to -58V High Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4V Low Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6V Loop Resistance (RL) . . . . . . . . . . . . . . . . . . . . . . . . . .200 to 1200W Operating Temperature Range HC-5502B-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 75oC HC-5502B-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC Thermal Resistance (Typical, Note 1) qJA (oC/W) qJC (oC/W) CERDIP Package . . . . . . . . . . . . . . . . 52 15 PDIP Package . . . . . . . . . . . . . . . . . . . 65 N/A SOIC Package . . . . . . . . . . . . . . . . . . . 75 N/A PLCC Package . . . . . . . . . . . . . . . . . . 65 N/A Maximum Junction Temperature (Hermetic Package). . . . . . . 175oC Maximum Junction Temperature (Plastic Package) . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC (PLCC and SOIC - Lead Tips Only) Die Characteristics Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 Diode Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Die Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 137 mils x 102 mils Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VBProcess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar-DI CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

搜索“Subscriber Line Interface Circuit”就会找到。

thanks a lot