SI3220 Datasheet | Silicon Labs

.. S i 3 2 2 0/25 DUAL PROSLIC® PROGRAMMABLE CMOS SLIC/CODEC Features Performs all BORSCHT functions Ideal for applications up to 18 kft Internal balanced ringing to 65 Vrms (Si3220) External bulk ringer support (Si3225) Software-programmable parameters: Ringing frequency, amplitude, cadence, and waveshape (Si3220) Two-wire ac impedance Transhybrid balance DC current loop feed (18- 45 mA) Loop closure and ring trip thresholds Ground key detect threshold Automatic switching of up to three battery supplies On-hook transmission Loop or ground start operation with smooth/abrupt polarity reversal Modem/fax tone detection DTMF generation/decoding Dual tone generators...