MIC 2 Click Board™

The small omnidirectional electret microphone features a reasonably flat frequency response, and it can be used within the frequency range between 100 Hz and 20 kHz. This range is perfectly suited for audio and/or speech applications. Due to its small size, programmable gain, low power supply, and reasonably good signal-to-noise ratio, the MIC 2 Click Board™ can be used for development of various audio and speech-related applications: speech or audio digitizing, digital audio monitoring and surveillance, digital "bugs", etc.

How Does The MIC 2 Click Board™ Work?

The MIC 2 Click Board™ is designed around a small omnidirectional electret microphone, accompanied by a digitally controlled pre-amp section. The pre-amp consists of the MCP6022, a dual, rail-to-rail, low noise operational amplifier from Microchip. This op-amp has a wide bandwidth of 10MHz, very low noise, and extremely low total harmonic distortion (THD). These features make it perfectly suitable to be used to build a microphone pre-amplifier (pre-amp). By adding a digital potentiometer IC in the feedback loop, it is possible to set the gain ratio by the host MCU.

The AD5171, a digital potentiometer IC with 64 positions from Analog Devices is used in the feedback loop to digitally control the gain ratio. This device contains an OTP memory (a fuse) which can be used to lock the wiper in a permanent position. The wiper data can be changed indefinitely until the internal protection fuse is blown. This can be done by a special command. However, the Click board™ must be operated at 5V in order to successfully blow up the fuse and lock down the wiper position permanently. Please consult the AD5171 for more details about the OTP memory programming and permanent lock-down of the wiper position.

The AD5171 uses the I2C interface to communicate with the host MCU. The slave I2C address of this device can be changed using the SMD jumper, labelled as ADDR SEL. This jumper sets the LSB of the address, allowing it to be selected between 0b0101100x, and 0b0101101x, where (x) represents the R/W bit. The datasheet of the AD5171 offers a comprehensive explanation of its operation. However, it is supported by a mikroSDK compatible set of libraries. These functions greatly simplify the use, ensuring that the accidental lock-down is avoided if not wanted.

One half of the MCP6022 is configured as a non-inverting amplifier, with the digital potentiometer connected as a rheostat in its feedback loop. The digital rheostat affects the feedback loop gain, allowing the host MCU to control it over the I2C interface. The input of the op-amp is biased by a voltage divider, so it stays at half the power supply voltage when there is no signal. This way when the signal appears at the input, it can swing both down to 0V and up to VCC. A minimum gain of the op-amp is 23. It can be increased as the AD5171 is moved away from the 0 position. After power ON, the wiper of the AD5171 is in the middle position (i.e. 25K, if it is not locked down to some other value).

The second op-amp of the MCP6022 serves as a unity-gain buffer, allowing the host MCU to sample the output over the AN pin of the mikroBUS™. Depending on the applied gain ratio, the output voltage may peak up to VCC. Therefore, care should be taken when selecting the voltage for the Click board™.

The power supply voltage for the MIC 2 Click Board™ can be selected using the VCC SEL jumper on the Click board™. As already mentioned, please avoid programming the OTP bit, if the supply voltage is set to 3.3V.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the MIC 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Amplifier OUT	AN	1	AN	PWM	16	NC
NC	2	RST	INT	15	NC
NC	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	SCL	I2C Clock
NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3V3	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

MIC 2 CLICK ELECTRICAL SPECIFICATIONS

ONBOARD SETTINGS AND INDICATORS