Line/speech circuit, LD/MF repertory dialler and tone ringer on one 28 pin CMOS chip

Operating range from 13 to 100 mA (down to 5mA with reduced performance)

Soft clipping to avoid harsh distortion
Volume control of receive signal
Line loss compensation selectable by pin option Low noise (max. - 72 dBmp)
Real or complex impedance
NET 4 compatible.
LD/MF switchable dialling
Pacifier tone during programming
31 digit last number redial
Sliding cursor protocol with comparison
Pause key for access pause or wait function
3 flash keys, 100 ms, 280 ms and 375/600 ms On chip MF filter (CEPT CS 203 compatible) Ring frequency discrimination
3-tone melody generator
Oscillator Frequency (Resonator: Murata CSA

3.58MG312AM)-3.58 MHz 4 4...4 8 Keyboard 

PIN TO PIN AS2533