GainAMP Click Board™

Product Code: MIKROE-2555

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.