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AS2520B

Part Number	AS2520B
Manufacturer	austriamicrosystems AG
Description	Telephone Speech Circuit with Loudhearing and Handsfree
Published	Mar 24, 2005
Detailed Description	Preliminary AS2520/21/20B/21B Telephone Speech Circuit with Loudhearing and Handsfree Austria Mikro Systeme Internatio...
Datasheet	AS2520B PDF File

Overview

Preliminary AS2520/21/20B/21B Telephone Speech Circuit with Loudhearing and Handsfree Austria Mikro Systeme International AG Key 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 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 circu...

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