The PCI66-18AISS8AO8 is a precision 18-Bit analog I/O product that provides eight simultaneously sampled input channels and eight simultaneously clocked output channels, Inputs and outputs can be clocked synchronously or independently at rates up to 500 KSPS per channel, and are supported by independent 512K-Sample FIFO data buffers. Both continuous and burst clocking modes are supported, and voltage ranges are independently software-selectable as ±10V, ±5V, ±2.5V, 0 to +10V or 0 to +5V for inputs and outputs. Clocking and triggering rates can be derived from internal rate generators, or from external clock and trigger sources to support the synchronous operation of multiple boards.
Input sampling employs successive-approximation (SAR) conversion, which avoids the high latency or minimum-rate limitations of delta-sigma and pipelined conversion schemes. Each analog input channel can be individually programmed to provide termination for current-loop instrumentation. The analog outputs use a weighted-DAC R-2R configuration which, like the analog inputs, minimizes latency and has no minimum clocking rate. The outputs can be software-configured for either single-ended or 3-wire differential operation.
On-demand autocalibration determines and applies error correction for all input and output channels, and a selftest input switching network permits board integrity to be verified by the host. Eight bidirectional digital I/O lines are programmable as inputs or outputs.