Introduction; About The Pci-445X - National Instruments DAQ PCI-4451 User Manual

Introduction

About the PCI-445X

© National Instruments Corporation
This chapter describes the PCI-4451/4452/4453/4454 (PCI-445X) devices,
lists what you need to get started, explains how to unpack your devices, and
describes the optional software and accessories.
The PCI-445X devices are high-performance, high-accuracy analog I/O
devices for the PCI bus. These devices are members of the Dynamic Signal
Acquisition/Analysis (DSA) product family and are specifically designed
for demanding dynamic signal acquisition applications. The PCI-445X
family features 16-bit simultaneously sampled input with a maximum rate
from 51.2 kS/s to 204.8 kS/s, optional 24-bit simultaneously updated
output at up to 51.2 kS/s, an optional eight lines of TTL-compatible digital
I/O, two 24-bit counter/timers for timing I/O, and multiple triggering
modes including external digital trigger. See Appendix A, Specifications,
for details about your PCI-445X.
The analog input and analog output circuitry both use oversampling
delta-sigma modulating converters. Delta-sigma converters are inherently
linear, provide built-in brick-wall anti-aliasing/imaging filters, and have
specifications that exceed other conventional technology for this
application with regard to total harmonic distortion (THD),
signal-to-noise ratio (SNR), and amplitude flatness. You can use these
high-quality specifications and features to acquire or generate signals with
high accuracy and fidelity without introducing noise or out-of-band aliases.
Applications for PCI-445X devices include audio signal processing and
analysis, acoustics and speech research, sonar, audio frequency test and
measurement, vibration and modal analysis, or any application requiring
high-fidelity signal acquisition or generation.
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