GainAMP click

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  • MIKROE-2555
  • MIKROE-2555
GainAMP click  carries the  LTC®6912  dual channel, low noise, digitally... more
Product information "GainAMP click"

GainAMP click carries the LTC®6912 dual channel, low noise, digitally programmable gain amplifier (PGA). The click is designed to work on either 3.3V or 5V power supply. It communicates with the target MCU over SPI interface, with additional functionality provided by the following pins on the mikroBUS™ line: AN, RST.

GainAMP click also features three pairs of screw terminals and a power indication LED.

How it works

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 analog or digital signals).

Specifications

Type Amplifier
Applications Data Acquisition Systems, Dynamic Gain Changing, Automatic Ranging Circuits, Automatic Gain Control.
MCU 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 SPI,Analog,GPIO
Input Voltage 3.3V or 5V
Compatibility mikroBUS
Click board size S (28.6 x 25.4 mm)

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).

NotesPinMikrobus logo.pngPinNotes
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

DescriptionMinTypMaxUnit
Total Supply Voltage (V+ to V–)     11V V
Input Current   ±10   mA
Operating Temperature Range –40°C   85°C  

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
JP1 AN_sel ON AN Analog input jumper.
JP2 V+ Left VCC V+ selection.
JP3 V- Left GND V- selection.

Programming

Code examples for GainAMP click, 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 }

 

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