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1 / 22 page sames SA2532 1/22 sames VERSATILE SINGLE CHIP TELEPHONE 4153 SA2532 A/C/U PDS039-SA2532-001 Rev. C 23-10-1995 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 n Ring frequency discrimination n Operating range from 13 to 100 mA (down to 5 mA with reduced perform- ance) n Low noise (max. -72dBmp) n Real or Complex impedance on chip pro- grammable n LD/MF switchable dialling n On chip MF filter (CEPT CS 203 compat- ible) n 3-tone melody generator with selectable repetition rates 1/22 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 discrimi- nation 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 com- ponents. This allows easy adaption to differ- ent PTT requirements without changing the PCB of the telephone. PACKAGE Available in 28 pin DIP and SOIC SA2532 HS DP DR-00975 OSC C3 C4 RR 14 AGND STB LLC CI MO DD RO2 RO1 LS V 1 R2 15 R4 R3 C1 C2 M2 MODE M1 FCI R1 28 SS V CS RI LI |
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