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AS2523/24 Single Chip Phone

Speakerphone IC with a Serial and Parallel Interface

The AS2523/24 is are speaker phone ICs for enhanced handsfree feature phones with CallerID and extended displays. AS2523 allows to use an off-the-shelf microprocessor without special blocks and functions for telephone applications. The AS2524 and AS2524B are developed to interface with common dialers.

AS2523 & AS2524 Speakerphone Circuit Block Diagram

(Click to Enlarge)

Key Features

  • Line/Speakerphone circuit on a 28-pin CMOS-IC
  • Handsfree function with enhanced voice switching
  • Serial I/F on AS2523, parallel I/F on AS2524
  • Operating range from 15mA to 100mA (down to 5mA with reduced performance)

Key Benefits

  • Unique EMC performance
  • Few external components
  • A off-the-shelf microprocessor without special blocks can be used
  • No external power supply (line powered)

AS2523/24 Applications

Enhanced handsfree feature phones with caller ID and extended displays.

AS2523/24 Product Facts

Supply voltage [V] 3.0 to 5.0
Operating range [mA] 15 to 150
Temperature range [°C] -25 to 70
Last number + memory dialing 0
Tone ringer
Handsfree function
Package SOIC-28,
die on foil