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Mikroelektronika d.o.o.

MIC 3 Click Board

MIC 3 Click Board

Microphone Pre-amplifier
SKU: MIKROE-4136
Regular price
£15.00 inc VAT
£12.60 exc VAT
Regular price £18.00 GBP Sale price
£15.00 inc VAT
£12.60 exc VAT
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Overview

The MIC 3 Click Board™ features the SSM2167-1RMZ-R7, a Microphone Preamplifier, from Analog Device. This Click Board™ is a low voltage Microphone preamplifier with Variable compression and noise gating. The MIC 3 Click is a very easy solution to work with it, which makes it an ideal solution for using it in desktop, portable or palmtop computers, telephone conferencing, communication headsets, two-way communication, surveillance system where the microphone is needed, stethoscope, karaoke and DJ mixers.

The MIC 3 Click Board™ is supported by a mikroSDK compliant library, which includes functions that simplify software development. This Click Board™ comes as a fully tested product, ready to be used on a system equipped with the mikroBUS™ socket.

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

mic 3 click inner img

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 Mikrobus logo.png 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.

 

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