ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS2525 Single Chip Phone

Single-chip speakerphone IC with a serial interface to a EEPROM

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The AS2525 is a single-chip IC for feature phones, answering machines and fax machines. It contains an analog line interface and speech circuit for a/b terminals, loudhearing, handsfree, enhanced LD/MF dialler, tone ringer with DC-DC converter and serial interface to EEPROM. The circuit is fully line powered and  uses an external EEPROM for a 32 digit last number redial storage and memories for 28 numbers each containing up to 24 digits/data.

Key Features

  • Line/Speakerphone circuit, LD/MF repertory dialler, and tone ringer on one 44 pin CMOS chip
  • All significant parameters programmable with external EEPROM
  • Handsfree function with enhanced voice switching
  • Serial interface for EEPROM and LCD driver
  • Operating range from 15mA to 100mA (down to 5mA with reduced performance)

Key Benefits

  • The programming of all parameters through an external EEPROM allows easy adaptation to various PTT requirements worldwide
  • Unique EMC performance
  • No external power supply (line powered)

Product Facts

Supply voltage [V] 3.0 to 5.0
Operating range [mA] 15 to 100
Temperature range [°C] -25 to 70
Last number + memory dialing 29
Tone ringer
Handsfree function
Package TQFP-44,
die on foil

Additional Information


Enhanced handsfree feature phones answering machines fax machines.