AS2522B

AS2522 is a flexible CMOS integrated circuit that incorporates DC and AC line adaptation (DC-mask and synthesized AC-impedance of 100^) as well as a speech circuit with softclipping, line loss compensation and Rxvolume control for handset and handsfree operation. It shall act as an a/b-line powered device, which is controlled by a CPU via a serial interface. Furthermore the AS2522 incorporates a DTMF, FSK transmitter, single tone and ringer tone generator.

AS2522 allows to use an off-the-shelf microprocessor without special blocks and functions for telephone applications. DTMF, FSK transmitter, single tone and ringer tone generator can be controlled via the serial interface as well as the gain settings in handset and handsfree mode.