National Instruments NI 9229, NI 9239 - page 11

© National Instruments Corp. 11 NI 9229/9239
The NI 9229/9239 analog input channels are floating with respect
to earth ground and each other. The incoming analog signal on each
channel is conditioned, buffered, and then sampled by a 24-bit
Delta-Sigma ADC.
Each channel provides an independent signal path and ADC,
enabling you to sample all four channels simultaneously. Refer to
Figure5 for an illustration of the circuitry for one channel.
Figure 5. Input Circuitry for One Channel of the NI 9229/9239
NI 9229/9239
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
Prefilter