MIC 3 Click Board™

Product Code: MIKROE-4136

The MIC 3 Click Board™ is based on the SSM2167-1RMZ-R7 from Analog Devices is a complete and flexible solution for conditioning microphone inputs in personal electronics and computer audio systems. The Click board™ is also excellent for improving vocal clarity in communications and public address systems. A low noise voltage-controlled amplifier (VCA) provides a gain that is dynamically adjusted by a control loop to maintain a set compression characteristic. The MIC 3 Click provides two operation settings, these settings are selectable with NOISE G. COMPR. jumpers. How Does The MIC 3 Click Board™ Work? The MIC 3 Click Board™ provides four different preset values of the noise gate threshold. Experiment with these values by varying the gate. The noise gate threshold is a programmable point using an external resistor. The downward expansion threshold may be set between −40 dBV and −55 dBV, as shown in Table. Noise Gate (dBV) Value of RGATE -40 0 Ω -48 1 Ω -54 2 Ω -55 3 Ω The MIC 3 Click Board™ provides four different preset values of the compression ratio.

Changing the scaling of the control signal fed to the VCA causes a change in the circuit compression ratio. Lowering RCOMP gives smaller compression ratios as indicated in Table. Automatic Gain Control (AGC) performance is achieved with compression ratios between 2:1 and 10:1, and is dependent on the application. Shorting RCOMP disables the AGC function, setting the compression equal to 1:1. Compression Ratio Value of RCOMP 1:1 0 Ω 2:1 15 Ω 5:1 75 Ω 10:1 174 Ω The MIC 3 Click Board™ is designed to work with either 3.3V or 5V power supply. It communicates with the target MCU over GPIO pin on the mikroBUS™. The supply current of the SSM2167 can be reduced to under 10 μA by applying an active low. SPECIFICATIONS Type Microphone Applications Karaoke and DJ mixers,Desktop, portable, or palmtop computers,Telephone conferencing. On-board modules SSM2167-1RMZ-R7, Low Voltage Microphone Preamplifier from Analog Device. Key Features Adjustable noise gate threshold,Adjustable compression ratio. Interface GPIO Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the MIC 3 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 NC Shutdown SHD 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator - NOISE G. COMPR 1:1, -40 Select noise gate threshold and compression ratio.