Features

• Detects 16 DTMF signals.

• Includes on-chip all filters required in a DTMF receiver

— Dial-tone filter

— High-frequency group bandpass filter

— Low-frequency group bandpass filter

• Serial data output

• Supports microprocessor-controlled guard times.

• Wide operating power-supply voltage range: 2.7 to 5.5 V

• Supports a low power mode that allows current dissipation to be reduced.

Applications

• Remote controllers for telephone answering machines

and other telephone products