AS2524TT

Overview

The AS2524TT is a CMOS telephone line interface and speakerphone circuit in a 28-pin SOIC package. It features a parallel interface for CPU control, synthesizing a 1000Ω AC impedance with selectable complex characteristics. The device integrates DC/AC line adaptation, enhanced voice switching, background noise monitoring, and dual softclipping for handset and handsfree modes. It includes a loudspeaker amplifier for external speakers and generates supply voltage for external circuitry. Operating current ranges from 15mA to 100mA, with reduced performance down to 5mA.

Feature Summary

• Parallel interface for standard dialler control
• Integrated loudspeaker amplifier for handsfree operation
• Background noise monitoring and enhanced voice switching
• Dual softclipping for acoustic shock prevention

Applications

• Enhanced handsfree feature phones with CallerID
• Devices with extended displays
• Systems interfacing with common Taiwanese dialers

Procurement Notes

Verify the specific suffix 'TT' against official manufacturer documentation to confirm exact tape-and-reel packaging or variant specifications. Ensure compatibility with the 28-pin SOIC form factor and validate that the parallel interface requirements match the target system design before finalizing procurement.

Selection Notes

Select the AS2524 over the AS2523 when a parallel interface is preferred over serial communication. Choose this model for applications requiring integrated loudspeaker amplification without programmable gain adjustments. Consider the AS2524B if automatic line loss compensation is required, as it is permanently activated in that variant.

Part Context

The AS2524 belongs to the AS2523/24 family of telephone line interface circuits manufactured by austriamicrosystems AG (now ams OSRAM). These ICs are designed for A/B-line powered devices, providing comprehensive speech processing and line adaptation capabilities for traditional telephony applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should consult the manufacturer's official documentation for potential cross-reference options or updated product line replacements.