AFLX-408A Flexible ADC (Full or ½-bridge, ICP, RTD, Thermocouple, FIR/IIR, 12.5 kHz b/w) – 8 Channels at 50 ksps

The AFLX-408A is used to condition and digitize up to eight analog channels. Each channel can be configured for use in differential ended or single ended voltage measurement, AC coupled single ended voltage, ICP sensor, RTD sensor (2/4 or 3-wire configurations), thermocouple, full-bridge, half-bridge, or potentiometer mode.

For each thermocouple channel, it is necessary to select the Junction Compensation Channel setting. Internally, the AFLX-408A performs linearization for RTD and thermocouple modes.

At the heart of the AFLX-408A is a hard-wired state-machine that oversamples all channels at a rate between 100 ksps and 200 ksps and digitally filters any noise above the user-programmable cut-off frequency. This is achieved using cascaded, 15-tap FIR filters with output rate decimation, followed by a final FIR or IIR filter. If IIR filtering mode is selected, the last digital filter in the filtering chain is an 8th or 16th order (selectable) Butterworth filter. If FIR mode is selected, the last digital filter in the filtering chain is a 49-tap Kaiser window, Beta 6 filter.

There are three independently configurable output streams per channel, allowing different sample rate, cut-off, and filter type to be selected for each output stream.

All signals are sampled simultaneously. When several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels are aligned.