MIKROE-3445, Audio IC Development Tools MIC 2 Click

MIKROE-3445 MIC 2 Click Mikroe MIKROE-3445 MIC 2 Click features a small electret microphone and a suitable pre-amplifying circuit. The Mikroe MIC 2 has a small electret microphone without sufficient line-level output. Therefore, a pre-amp has to be used. The pre-amp circuit comprises a dual op-amp and a digitally controlled potentiometer IC. The AD5171 makes it possible to control the feedback loop gain of the MCP6022 op-amp over the I2C interface in 64 discrete steps. The AD5171 digital potentiometer IC can lock out its wiper using an OTP fuse bit. Once locked, it will permanently retain the programmed value.