PRODUCTS & TECHNOLOGY
I/O Extension Module Adds Analog and Digital I/O to FPGA Boards
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A multi-function I/O extension module adds A/D, D/A and digital I/O signal processing functions to a FPGA processor board. The AXM-A75extension I/O module from Acromag plugs directly onto the company’s PMC and XMC reconfigurable FPGA cards equipped with an AXM mezzanine connector. Engineers can interface a number of high-level analog voltage signals to and from the FPGA. TTL-level digital I/O channels can monitor and control discrete devices. A 68-pin VHDCI receptacle provides easy field I/O connections. The operating range is -40° to 85°C. Typical uses include hardware simulation, in-circuit diagnostics, machine control, signal intelligence and image processing. List price is $1,700. AXM extension modules like the AXM-A75 provide a convenient method to interface real-world signals to and from the FPGA for high-speed measurement and control operations.
There are 16 differential analog input channels on the AXM-A75. Each input has its own high-speed, 16-bit 250 kHz A/D converter, offering the ability to simultaneously sample all channels. A low-pass filter removes unwanted EMI. The input range is ±10 volts with programmable gain of 1x, 2x, 4x or 8x. Serial FLASH memory stores the factory calibration constants. Two quad DAC devices drive eight analog output channels with a range of ±10V. Each channel has its own high-speed 16-bit D/A converter, which allows updating of individual channels or all outputs simultaneously. The D/A settling time is 10µS.
Sixteen bi-directional digital I/O channels provide the ability to read or write 5V logic levels on TTL devices. Each I/O channel is individually configurable as an input or output for great flexibility to match your requirements. The open drain outputs are pulled high via a pull-up resistor.