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AS2522B Single Chip Phone

Speakerphone IC with a Serial Interface to Standard CPU

The AS2522B is speaker phone IC for enhanced handsfree feature phones with CallerID and extended displays and incorporates a DTMF, FSK transmitter, single tone and ringer tone generator.

The AS2522 allows for use of an off-the-shelf microprocessor without special blocks and functions for telephone applications. The DTMF, FSK transmitter, single tone and ringer tone generator can be controlled via the serial interface as well as the gain settings in handset and handsfree mode.

A2522B Single Chip Speakerphone Circuit Block Diagram

(Click to Enlarge)

Key Features

  • Line/Speech circuit, DTMF dialer, FSK transmitter and tone ringere on a 32-pin CMOS-IC
  • Handsfree function with enhanced voice switching
  • Digital volume control of Rx signals
  • 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)

AS2522B Applications

Enhanced handsfree feature phones with caller ID and extended displays.

AS2522B 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 TQFP-32,
die on foil