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AS2521B

Part Number	AS2521B
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	AS2521B 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 circuit, loudhearing and handsfree - all supervised by the novel voice and power control circuit.
A switching converter is also provided for converting the ring signal.
The interface to a dialler/controller is made very simple to allow easy adaptation to a telecom microcontroller.
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.
Lb 3V 1 4 7 2 5 8 0 3 6 9 # DIALLER µCONTROLLER LCD DRIVER TELEPHONE SPEECH CIRCUIT WITH LOUDHEARING, HANDSFREE, DC/DC CONVERTER HSM * HFM AS2520 Figure 1: Typical Handsfree Telephone Application Rev.
5.
1 Page 1 May 1999 Preliminary Pin Description Pin # 1 2 3 Name LS CI RO Type AI AI AO Description Line Current Sense Input This input is used for sensing the line current.
Complex Impedance Inpu...

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