AS2523

The AS2523 is a CMOS integrated circuit designed for telephone line interface and speakerphone applications. It operates as an a/b-line powered device, controlled via a serial interface. Key features include enhanced voice switching, background noise monitoring, and programmable Tx- and Rx-gain. The circuit supports digital volume control for Rx signals and programmable DC characteristics. It also includes dual softclipping in both handset and handsfree modes, along with a loudspeaker amplifier for loudhearing and handsfree operation. The AS2523 provides supply voltage generation for external circuitry and features automatic line loss compensation. Its impedance can be selected as real or complex using external components, and side tone adaptation is also selectable. The device offers unique EMC performance and operates within a current range of 15mA to 100mA. It is supplied in a 28-pin SOIC package and is suitable for surface mounting.

This IC incorporates DC and AC line adaptation, including a synthesized AC impedance of 1000Ω. It is designed for applications such as enhanced handsfree feature phones with CallerID and extended displays. The AS2523 is part of a family that includes AS2524 and AS2524B, with the AS2523 specifically offering a serial interface for CPU control, while the others use a parallel interface for standard dialers. The package is a 28-SOIC with a width of 7.50mm.