Today, most telephone equipment use a DTMF receiver IC. One common DTMF receiver IC is the Motorola MT8870 that is widely used in electronic communications circuits. The MT8870 is an 18-pin IC. It is ...

The AK2363 is a radio signaling LSI device into which an MSK modem and a DTMF Receiver are integrated on a single chip. The internal operation is controlled by the three-wire serial method in which ...