The 8-channel PCI-16HSDI analog input board provides high-density precision 16-bit analog input resources on a standard PCI expansion board. Optimized for flexibility and performance, the board is ideal for a wide variety of applications, ranging from simple precision voltage measurements, to the analysis of complex audio signals and waveforms. Each of the eight sigma-delta analog input channels can be controlled by any one of four independent sample clocks, and multiple channels can be harmonically locked together. A/D conversions on multiple boards can be synchronized and phase-locked. Sample rates are adjustable from 30 KSPS to 1.1 MSPS, and the input range is software selectable as ±1.25V, ±2.5V, ±5V or ±10V.
Internal autocalibration networks permit periodic calibration to be performed without removing the board from the system. Each ADC contains a digital antialiasing filter that rejects out-of-band signals above approximately 48 percent of the selected sample rate. Lowpass analog input filters remove those interference signals that fall within the harmonic images of the digital filter, the first of which occurs at 16-32 times the sample rate. Multiple channels can be synchronized to perform sampling in “lockstep”, either by a software command, or by external hardware sync and clock input signals. Hardware sync and clock input/output signals permit multiple boards to be daisy-chained together for phase-locked operation from a common clock.