Simultaneous Sampled Analog Input
The General Purpose Inverter Controller (GPIC) has 16 simultaneous sampling analog inputs,
which acquire samples at a rate of 180 kS/s per channel. Phase difference between channels is
minimal due to the simultaneous sampling and high bandwidth of these signals. Each GPIC
input is differential with a software-range of ±10 V or ±5 V. These inputs should be used for
signals whose bandwidth and phase information is important for the control algorithm. Phase
current and DC link voltage from inverters can be connected to simultaneous sampled AI.
The sbRIO-9687 has 16 external analog inputs that can be connected to the GPIC
simultaneous sampling analog inputs. Other features of the analog input circuitry include:
• Pads for current-sensing resistor option on each input.
• Low pass filter and gain stage for each input.
• Eight configurable over-range comparators.
The following figure shows depicts a block diagram for simultaneous sampled analog input.
sbRIO-9687 User Manual | © National Instruments | 15
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