austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com austriamicrosystems Multi-Standard CMOS Telephone IC for Basic Telephones DATA SHEET AS2533-36 - Rx and Tx soft clipping to avoid harsh distortion General Description - Real or complex impedance (EU compliant) The AS253x is a CMOS integrated circuit that contains all - Stabilized supply for dialler and peripherals the functions needed to build a high performance electronic - Automatic line loss compensation telephone set with basic features. - Operating range from 13 to 100 mA (down to 5 mA with reduced performance) The AS253x incorporates a line interface, a speech circuit, - Unique EMI performance (EU compliant) a dialler and ringer. It is a real single-chip / single-die IC with 28 pins. It allows either package mounting or chip-on- Dialler board mounting. - LD/MF dialing and mixed-mode dialing The device is available in 4 versions (pin-compatible) with - 31 digit last number redial (LNR) different features ranging from LNR only (last number - 4 direct/10 indirect (AS2533/36), 12 direct (AS2535) redial) to 4 direct (one-touch) memories and 10 indirect - Repeat dialing by busy or engaged (not AS2535) (two-touch) memories. The sliding cursor procedure makes - Confidence tone during memory programming and mute the LNR function easy to use under various PABX systems. - Notepad memory function The versatility of the circuit is provided by pin options and a - Pause key for access pause or wait function few external components. This allows fast time-to-market - 3 flash timings, 100 ms, 280 ms and 375/600 ms and easy adaptation to different PTT requirements. A - Sliding cursor protocol with comparison unique EMI performance has been achieved due to the consequent use of CMOS amplifiers. Ringer - Ring frequency discrimination Key Features - 3-tone melody generator - Ring melody selection via keyboard Line Interface and Speech Circuit - Ring volume selection via keyboard - Version available with fixed ring melody and ring volume - Electronic Rx volume control - Electronic microphone mute Package - Microphone amplifier with symmetrical input - SOIC 28 or DIE Block Diagram Figure 1 Block Diagram Revision 8.10 Page 1 of 25 ams AG Technical content still valid