TM8000 Mobile Radio Accessories Manual TMAA02-02 DTMF Microphone 49
March 2004 © Tait Electronics Limited
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4.5 Circuit Description
The microphone has a standard 12-key telephone keypad. When one of the
keypad keys is pressed, a DTMF tone specific to that key is generated on the
MIC_AUD line (pin 5). For the duration of the tone, the tone generator
activates the PTT, so that the user is not required to press the PTT key to
transmit each tone.
Figure 4.2 DTMF microphone to radio interface
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