Mikroelektronika d.o.o.
GainAMP Click Board
GainAMP Click Board
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Overview
The GainAMP Click Board™ is based on the LTC6912 dual-channel, low noise, digitally programmable gain amplifier (PGA).
The GainAMP Click Board™ is designed to work on a 3.3V or 5V power supply. It communicates with the target MCU over the SPI interface, with additional functionality provided by the following pins on the mikroBUS line: AN, RST.
The GainAMP Click Board™ carries the LTC6912 dual-channel, low noise, digitally programmable gain amplifier (PGA), from Analog Devices. The click is designed to work on either a 3.3V or 5V power supply. It communicates with the target MCU over the SPI interface, with additional functionality provided by the following pins on the mikroBUS™ line: AN, RST.
The GainAMP Click Board™ also features three pairs of screw terminals and a power indication LED.
How Does The GainAMP Click Board™ Work?
The gains for both channels are independently programmable, using a 3-wire SPI interface to select voltage gains of 0, 1, 2, 5, 10, 20, 50, and 100V/V (LTC6912-1). All gains are inverting.
The LTC®6912 consists of 2 matched amplifiers with rail-to-rail outputs. When operated with unity gain, they will also process rail-to-rail input signals.
A half-supply reference generated internally at the AGND pin supports single power supply applications. Operating from single or split supplies from 2.7V to 10.5V total.
Programmable Gain Amplifier
A programmable gain amplifier (PGA) is an electronic amplifier whose gain can be controlled externally (by analogue or digital signals).
Specifications
| Type | Amplifier |
| Applications | Data Acquisition Systems, Dynamic Gain Changing, Automatic Ranging Circuits, Automatic Gain Control. |
| On-board modules | LTC®6912 dual-channel gain amplifier |
| Key Features | Rail-to-Rail Output Swing, Rail-to-Rail Input Range, 2 Channels with Independent Gain Control, Three pairs of screw terminals, 3-wire SPI interface |
| Interface | Analog,GPIO,SPI |
| Compatibility | mikroBUS |
| Click board size | S (28.6 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
Pinout Diagram
This table shows how the pinout on GainAMP click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| Analog input | AN_IN | 1 | AN | PWM | 16 | NC | |
| Shut down | SHDN | 2 | RST | INT | 15 | NC | |
| Chip select | SPI_CS | 3 | CS | TX | 14 | NC | |
| SPI Clock Input | SPI_CLK | 4 | SCK | RX | 13 | NC | |
| NC | 5 | MISO | SCL | 12 | NC | ||
| SPI Master Output Slave Input | SPI_MOSI | 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 |
Maximum Ratings
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Total Supply Voltage (V+ to V–) | 11V | V | ||
| Input Current | ±10 | mA | ||
| Operating Temperature Range | –40°C | 85°C |
Jumpers and settings
| Designator | Name | Default Position | Default Option | Description |
|---|---|---|---|---|
| JP1 | AN_sel | ON | AN | Analog input jumper. |
| JP2 | V+ | Left | VCC | V+ selection. |
| JP3 | V- | Left | GND | V- selection. |
Software Support
Code examples for the GainAMP Click Board™, written for MikroElektronika hardware and compilers are available on Libstock.
The gains for both channels are independently programmable using an SPI interface to select voltage gains. The example controls channel A, increasing and decreasing gain with input buttons.
Code Snippet
The code snippet demonstrates a simple usage of the helper function.
01 void main()
02 {
03 system_init();
04
05 gain_amp_set(GAIN_AMP_NOMINAL_0, GAIN_AMP_SW_SHUTDOWN);
06
07 while( 1 )
08 {
09 if(Button(&GPIOE_IDR, 9, 100, 1))
10 {
11 byte = gain_amp_set(++gain & 0x07, GAIN_AMP_SW_SHUTDOWN);
12 GPIOD_ODR = (GPIOD_ODR & 0xFF00) | byte;
13 }
14 if(Button(&GPIOE_IDR, 8, 100, 1))
15 {
16 byte = gain_amp_set(--gain & 0x07, GAIN_AMP_SW_SHUTDOWN);
17 GPIOD_ODR = (GPIOD_ODR & 0xFF00) | byte;
18 }
19 }
20 }
Software Support
Code examples for the GainAMP Click Board™, written for MikroElektronika hardware and compilers are available on Libstock.
The gains for both channels are independently programmable using an SPI interface to select voltage gains. The example controls channel A, increasing and decreasing gain with input buttons.
Code Snippet
The code snippet demonstrates a simple usage of the helper function.
01 void main()
02 {
03 system_init();
04
05 gain_amp_set(GAIN_AMP_NOMINAL_0, GAIN_AMP_SW_SHUTDOWN);
06
07 while( 1 )
08 {
09 if(Button(&GPIOE_IDR, 9, 100, 1))
10 {
11 byte = gain_amp_set(++gain & 0x07, GAIN_AMP_SW_SHUTDOWN);
12 GPIOD_ODR = (GPIOD_ODR & 0xFF00) | byte;
13 }
14 if(Button(&GPIOE_IDR, 8, 100, 1))
15 {
16 byte = gain_amp_set(--gain & 0x07, GAIN_AMP_SW_SHUTDOWN);
17 GPIOD_ODR = (GPIOD_ODR & 0xFF00) | byte;
18 }
19 }
20 }
Frequently Asked Questions
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