Analog-to-Digital (A/D)

For Multi-function Embedded Boards, Modules C1 to C4 provide up to 10 distinct Analog-to-Digital (A/D) channels, featuring one 16-bit A/D converter for each individual channel. A/D converter has a 200 kHz sampling rate per channel. The input range and gain is field programmable for each channel. Each of these differential channels includes a second order anti-aliasing filter and a post filter that has a digitally programmable break point that enables user to field adjust the filtering for each channel. All A/D channels are self-calibrating because each channel, on a rotating basis, is automatically calibrated to eliminate offset and gain errors. The ability to set lower voltages for Full Scale Input assures the utilization of the full resolution (does not apply to Current Measurement Module C3 which is fixed unipolar, 0-25mA FS). Open inputs cannot be sensed because scaling input resistor networks are used. All inputs are double buffered for immediate availability. The “Latch” feature permits the user to read all A/D channels at the same time. The module includes A/D FIFO Buffering for greater control of the incoming signal (data) for analysis and display. The A/D buffer will accept and/or manipulate the data based on the setting of the base A/D rate. The data can be “stored” in the buffer at the same rate as the Base A/D rate or by a divided multiple as set in the Sample Rate Register. The thresholds of the buffer can be utilized for data flow control.