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 Telephone Line Interface and Speakerphone Circuit DATA SHEET AS2523, AS2524, AS2524B Key Features General Description - Line/Speakerphone circuit on a 28-pin CMOS-IC, simple AS2523/24 is a CMOS integrated circuit that incorporates inventory: same die for AS2523/24 and AS2523/24B DC and AC line adaptation (DC-mask and synthesized AC- - Serial I/F on AS2523, parallel I/F on AS2524 impedance of 1000 ) as well as a speech circuit with - Enhanced voice switching softclipping, line loss compensation and Rx-volume control - Background noise monitoring for handset and handsfree operation. It shall act as an a/b- - Tx- and Rx-gain programmable on AS2523 only line powered device, which is controlled by a CPU via a - Digital volume control of Rx signals on AS2523 only serial interface on AS2523 or a standard dialler via a - DC characteristic programmable on AS2523 only parallel interface on AS2524 and AS2524B. - Dual softclipping in handset mode on AS2523 only - Dual softclipping in handsfree mode on AS2523 only - Loudspeaker amplifier for loudhearing and handsfree Applications - Supply voltage generation for external circuitry Enhanced handsfree feature phones with CallerID and - Automatic line loss compensation on AS2523 / 24B only extended displays. The AS2524 and AS2524B are - Real and complex impedance selectable by external developed to interface with common Taiwanese dialers. components - Side tone adaptation selectable by external components - Unique EMC performance Package - Operating range from 15mA to 100mA (down to 5mA Available in 28-pin SOIC or die with reduced performance) - Few external components Block Diagram Revision 1.13 Page 1 of 19 ams AG Technical content still valid