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AS2520 Datasheet(PDF) 1 Page - ams AG |
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AS2520 Datasheet(HTML) 1 Page - ams AG |
1 / 14 page Preliminary AS2520/21/20B/21B Rev. 5.1 Page 1 May 1999 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 Typical Application 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. Package Available in 28 pin SOP and DIP. Lb 3V La AS2520 DIALLER µCONTROLLER LCD DRIVER 1 2 3 4 5 6 7 8 9 * 0 # HSM HFM TELEPHONE SPEECH CIRCUIT WITH LOUDHEARING, HANDSFREE, DC/DC CONVERTER Figure 1: Typical Handsfree Telephone Application Austria Mikro Systeme International AG Telephone Speech Circuit with Loudhearing and Handsfree |
Similar Part No. - AS2520 |
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Similar Description - AS2520 |
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