AS2524 T

Overview

The AS2524 T is a CMOS integrated circuit designed for enhanced line and speakerphone applications. It incorporates DC and AC line adaptation, speech circuits with softclipping, and loudspeaker amplification. The device operates in handset or handsfree modes and features a parallel interface controlled by standard dialers. Key electrical parameters include an operating current of 3 to 10 mA depending on the mode, a transmit gain of +36.5 dB (handset) or +45.0 dB (handsfree), and a receive gain of +7.5 dB (RO) or +34 dB (LO). The supply voltage range supports operation from 15 mA to 100 mA, with reduced performance down to 5 mA.

Feature Summary

• Integrated speech circuitry with dual softclipping for acoustic shock prevention
• Parallel interface compatibility with common Taiwanese dialers
• Built-in voice switching circuitry for full two-way speakerphone operation
• Loudspeaker amplifier support for handsfree and loudhearing modes

Applications

• Enhanced handsfree feature phones with CallerID capabilities
• Telephones equipped with extended displays
• Devices interfacing with standard parallel dialers

Procurement Notes

Verify the specific suffix 'T' corresponds to the SOIC-28 plastic surface-mounted package variant as listed in the ordering information. Confirm that the parallel interface requirement aligns with the AS2524 architecture rather than the serial interface found on the AS2523. Ensure external components for impedance synthesis and side tone balancing are selected according to the datasheet specifications.

Selection Notes

Select the AS2524 T when a parallel interface is required instead of the serial interface available on the AS2523. This model lacks programmable Tx/Rx gain and digital volume control, which are exclusive to the AS2523. Consider the AS2524B if Line Loss Compensation is needed without serial programming. Verify that the application supports the fixed gain settings defined for the parallel interface version.

Part Context

The AS2524 belongs to the AS2523/24 family developed by austriamicrosystems AG (now ams AG). These ICs share the same silicon die but differ in interface type and feature availability. The AS2524 specifically targets markets requiring simple parallel control via standard dialers, distinguishing it from the fully programmable AS2523 and the LLC-enabled AS2524B.

Replacement Considerations

Public confirmed substitute part numbers: AS2524B T.