SA2532

SA2532 sames FEATURES n Speech circuit, LD/MF Dialler and Tone Ringer on one 28 pin CMOS chip n Soft clip to avoid harsh distortion n Line Loss Compensation selectable by pin option n Power down mode n Versatile applications for different PTT demands n 31 digit last number redial n Sliding Cursor protocol with comparison n 2 Flash keys, 100 ms and 280 ms (option 600 ms) n Pause key for 3 sec Auto Pause or Wait Function GENERAL DESCRIPTION The SA2532 is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. The device incorporates LD/MF dialling, melody generation, ring frequency discrimination and a high quality speech circuit. A RAM is on chip for a 31 digit last number redial. The sliding cursor procedure makes Last Number Redial easy behind a PABX. The versatility of the circuit is provided by on chip programmability and a few external components. This allows easy adaption to different PTT requirements without changing the PCB of the telephone. n n SA2532 A/C/U VERSATILE SINGLE CHIP TELEPHONE Ring frequency discrimination Operating range from 13 to 100 mA (down to 5 mA with reduced performance) Low noise (max. -72dBmp) Real or Complex impedance on chip programmable LD/MF switchable dialling On chip MF filter (CEPT CS 203 compatible) 3-tone melody generator with selectable repetition rates n n n n n PACKAGE Available in 28 pin DIP and SOIC LS RO2 RO1 V DD A GND STB CI MO LLC HS DP OSC RR C4 C3 1 28 RI LI V ...