AS2523

Overview

The AS2523 is a CMOS integrated circuit designed as a telephone line interface and speakerphone circuit. It incorporates DC and AC line adaptation, synthesized AC-impedance of 1000Ω, and speech processing with softclipping and line loss compensation for handset and handsfree operation. The device operates as an A/B-line powered unit controlled via a serial interface. Key electrical parameters include a recommended operating supply voltage range of 3V to 5V and an operating temperature range of -25°C to +70°C. In speech mode, the typical operating current is 6mA, increasing to 10mA in handsfree mode.

Feature Summary

• Integrated serial interface for CPU control enabling programmable transmit and receive gain adjustments
• Built-in line loss compensation functionality with selectable activation thresholds
• Dual softclipping circuits for both handset and handsfree modes to prevent acoustic shock
• Background noise monitoring capability to optimize voice switching performance

Applications

• Enhanced handsfree feature phones with CallerID support
• Telecommunication devices requiring extended display interfaces
• A/B-line powered telephony equipment

Procurement Notes

Verify component authenticity by checking the marking code on the package against the datasheet specifications. Confirm the suffix 'T' indicates the SOIC-28 plastic surface-mounted package. Ensure the ordering information matches the specific variant requirements for your design implementation.

Selection Notes

Select the AS2523 when a serial interface is required for flexible gain programming and line loss compensation configuration. This model is distinct from the parallel interface variants (AS2524/24B). Verify that the system architecture supports the necessary serial clock and data lines for register configuration.

Part Context

The AS2523 shares the same silicon die as the AS2524 and AS2524B models. The primary differentiation lies in the control interface; the AS2523 utilizes a serial interface, whereas the other variants use a parallel interface. All three models offer identical core analog performance and voice switching capabilities within the same 28-pin package family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer for current availability or alternative solutions if this obsolete component is no longer sourced.