The 16-channel PCI-16SDI analog input board provides high-density precision 16-bit analog input resources on a standard PCI expansion board, and requires no external filters for antialiasing. 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 16 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 deep FIFO buffer holds up to 256K channel-tagged input samples. A/ D conversions on multiple boards can be synchronized and phase-locked. Sample rates from 5 to 220 KHz per channel.