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Texas Instruments CD326x Audio Interface Transmitter is compatible with specially enabled audio interfaces and supports two operating modes: button mode and tone mode. The audio interface transmitter features a 3µA low quiescent current in button mode and a 110µA low quiescent current in tone mode. The button mode doesn't support a microphone, and it passes the DC voltage from an external switch-resistor network to the MIC pin to externally measure the voltage. The tone mode offers microphone support and senses button presses based on an external switch-resistor network. The CD326x audio interface transmitter is in a miniature DSBGA (YZP) package. The audio interface transmitter is ideal for a wired headset signaling transmitter that is compatible with systems with a specially enabled audio interface.
