AXM-
A75 User’s Manual
Multifunction I/O Mezzanine Board
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GENERAL INFORMATION
The AXM-A75 is a high speed analog input/output mezzanine board
compatible with
Acromag’s line of re
-configurable PMC and XMC
FPGA modules. The AXM-A75 has 16 differential analog inputs, 8
analog outputs and 16 digital inputs/outputs.
KEY FEATURES
High Speed Analog Input
-
sixteen independent 16-bit Analog to
Digital Converter (ADC) channels provide simultaneous sampling at a
maximum rate of 500 KHz. The digitized output of each ADC is
simultaneously input to the Field Programmable Gate Array (FPGA)
for data collection and processing.
Programmable Input Voltage Range
- four gain selections are
available that allow a bipolar input voltage range from ± 1.28 Volts to
± 10.24 Volts.
Analog Output
–
eight 16-bit Digital to Analog Converter (DAC)
channels provide simultaneous update with a maximum rate of
100 KHz.
Programmable Output Voltage Range
–
three gain selections are
available that allow a bipolar output voltage range from ± 10 Volts to
± 10.5263 Volts.
Calibration Constants
–
factory calibration constants used to correct
gain and offset errors are stored in on-board FLASH memory.
Correction constants are stored for each channel and gain selection
combination. Gain and offset correction are supported for both
analog input and analog output.
General Purpose Digital Input or Output
–
sixteen general purpose
I/O signals are provided. The outputs are pulled high via pull-up
resistors.
Example Design
–
the example VHDL design provided in the base
board EDK provides the following features:
•
Control of ADC sample rate and gain selection.
•
Gain and offset error correction is applied in FPGA hardware
for analog inputs and on-chip for analog outputs.
•
Each ADC channel includes a FIFO capable of storing 2050
samples.
•
All enabled ADC channels are sampled simultaneously. ADC
sample rate can range from 1/34 Hz to 500 KHz.
•
Control of DAC gain selection.
