AS2533

Data Sheet AS2533...6 ® Austria Mikro Systeme International AG Multi-Standard CMOS Single Chip Telephone IC with Dual Soft Clipping General Description The AS253x is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. The device incorporates LD/MF repertory dialling, melody generation, ring frequency discrimination and a high quality line/speech circuit. A RAM is on chip for a 31 digit last number redial and memories (not AS2534) each containing up to 21 digits/ data. The sliding cursor procedure makes the LNR function easy to use under various PABX systems. Also centrex keys (not AS2535) are provided. The device incorporate a volume control for the earpiece. The volume can be controlled by the VOL key (+ 5.4 dB) or by the –/+ keys (+8.1 dB/-5.4 dB in 5 steps). The versatility of the circuit is provided by pin options and a few external components. This allows easy adaptation to different PTT requirements. Key Features u Line/speech circuit, LD/MF repertory dialler and tone ringer on one 28 pin CMOS chip u Operating range from 13 to 100 mA (down to 5 mA with reduced performance) u Soft clipping to avoid harsh distortion u Volume control of receive signal u Line loss compensation selectable by pin option u Low noise (max. - 72 dBmp) u Real or complex impedance u NET 4 compatible u LD/MF switchable dialling u Pacifier tone during programming u 31 digit last number redial u Repertory memories (not AS2534), 4 direc...