AS2521B Datasheet PDF | austriamicrosystems AG

austriamicrosystems AG AS2521B

The AS2520/21/20B/21B are CMOS integrated circuits that contain all the audio functions needed to form a high comfort, line-powered telephone. The devices incorporate line adaptation, speech circuit, loudhearing and handsfree - all supervised by the novel voice and power control circuit. The interface to a dialler/controller is made very simple to allow easy adaptation to a telecom microcontroller.

Part No.	AS2521B
Datasheet	AS2521B Download
Manufacturer	austriamicrosystems AG
Description	Telephone Speech Circuit with Loudhearing and Handsfree
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FEATURES

u Line/speech circuit, loudhearing, handsfree and dc/dc converter on one 28 pin CMOS chip u Operating range from 13 to 100 mA (down to 5 mA with reduced performance) u Soft clipping control eliminating harsh distortion u Volume control of receive signal with squelch and automatic loop gain compensation u Line loss compensation pin selectable u Low noise (max. - 72 dBmp) u Real or complex impedance adjustable u NET 4 compatible u Dynamically controlled voice switching u Same monitor amplifier for loudhearing, handsfree and tone ringer u Very few external components u Power derived from ring signal by switching converter during ringing

GENERAL DESCRIPTION

A switching converter is also provided for converting the ring signal. The AS2520 series incorporate volume control for the earpiece and the loudspeaker (AS2520 digital with +/keys and AS2521 analogue with potentiometer). The volume control circuit automatically compensates the loop gain to ensure acoustic stability. Typical Application La Package Available in 28 pin SOP and DIP.