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Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
A/D converter type Successive approximation
Resolution 16 bits
Number of channels 16 single-ended/8 differential, software-selectable.
Up to 48 additional analog inputs per module are available with the optional AI-EXP48
module. Expansion channel features are the same as those of the main channels.
Input ranges (software and
sequencer programmable)
Bipolar: ±10 V, ±5 V, ±2 V, ±1 V , ±0.5 V, ±0.2 V, ±0.1 V
Maximum sample rate 1 MHz
Nonlinearity (integral) ±2 LSB maximum
Nonlinearity (differential) ±1 LSB maximum
A/D pacing
Onboard input scan clock, external source (APR)
Trigger sources and modes
See Table 8
Acquisition data buffer
1 MSample
Data transfer DMA
Configuration memory
Programmable I/O
Range: ±10 V, ±5 V, ±2 V, ±1 V, ±0.5 V 10.5 V maximum
Maximum usable input
voltage + common mode
voltage (CMV + V
in
)
Range: ±0.2 V, ±0.1 V 2.1 V maximum
Signal to noise and distortion 72 dB typical for ±10 V range, 1 kHz fundamental
Total harmonic distortion -80 dB typical for ±10 V range, 1 kHz fundamental
Calibration Auto-calibration, calibration factors for each range stored onboard in non-volatile RAM.
CMRR @ 60 Hz -70 dB typical DC to 1 kHz
Bias current 40 pA typical (0 °C to 35°C)
Crosstalk -75 dB typical DC to 60 Hz; -65 dB typical @ 10 kHz
Input impedance 10 M single-ended, 20 M differential
Absolute maximum input
voltage
±30 V
Accuracy
Table 2. Analog input accuracy specifications
Voltage range Accuracy
±(% of reading + %
range)
23°C ±10 °C, 1 year
Temperature coefficient
±(ppm of reading + ppm range)/°C
Noise (cts
RMS)
-10 V to 10 V 0.031% + 0.008% 14 + 8 2.0
-5 V to 5 V
0.031% + 0.009% 14 + 9
3.0
-2 V to 2 V
0.031% + 0.010% 14 +10
2.0
-1 V to 1 V
0.031% + 0.02% 14 + 12
3.5
-500 mV to 500 mV
0.031% + 0.04% 14 +18
5.5
-200 mV to 200 mV
0.036% + 0.075% 14 +12
8.0
-100 mV to 100 mV
Note 1
0.042% + 0.15% 14 +18
14.0
Note 2