P104P-16HSDI 8-Channel 16-Bit Sigma-Delta Analog Input PCI Board

The 6-channel PC104P-16HSDI analog input board provides high-density precision 16-bit analog input resources in a single PC104P form factor. Optimized for flexibility and performance, the board is ideal for a wide variety of applications, ranging from precision voltage measurements, to the analysis of complex audio signals and waveforms. Each of the six sigma-delta analog input channels can be controlled by either of two independent sample clocks, and multiple channels can be harmonically locked together. 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 auto calibration networks permit periodic calibration to be performed without removing the board from the system.

Each of the six input channels contains an input buffer, an adaptive digital-image filter, and a dedicated sigma-delta A/D converter (ADC). The inputs can be configured for either differential or single-ended operation, or an internal voltage reference can be applied to all channels to support selftest operations and auto calibration. Gain and offset trimming of the input channels is performed by calibration DAC's that are loaded with channel correction values during auto calibration. The use of calibration DAC's eliminates the missing codes that occur when analog input channels are calibrated exclusively in the digital domain. Each ADC contains a digital antialiasing filter that rejects out-of-band signals above approximately 48 percent of the selected sample rate. Conversion data from all active channels is transferred to the PCI bus through a 64K-sample data buffer that has a software-controlled threshold for generating interrupt requests. Multiple channels can be synchronized to perform synchronous