Appendix A
Specifications
©
National Instruments Corporation
A-3
Transfer Characteristics
Relative accuracy ................................... ±1.5 LSB typ, ±3.0 LSB max
DNL ....................................................... ±0.5 LSB typ, ±1.0 LSB max
No missing codes ................................... 16 bits, guaranteed
Offset error
Pregain error after calibration ......... ±1.0
µ
V max
Pregain error before calibration ...... ±2.92 mV max
Postgain error after calibration ....... ±305
µ
V max
Postgain error before calibration..... ±70.3 mV max
Gain error (relative to calibration reference)
After calibration (gain = 1) ............. ±74 ppm of reading max
Before calibration ........................... ±18,900 ppm of reading max
Gain
≠
1 with gain error
adjusted to 0 at gain = 1 ................. ±300 ppm of reading max
Amplifier Characteristics
Input impedance
Normal powered on ........................ 100 G
Ω
in parallel with 100 pF
Powered off..................................... 820
Ω
Overload.......................................... 820
Ω
Input bias current ................................... ±200 pA
Input offset current................................. ±100 pA
CMRR (DC to 60 Hz)
Gain 0.5, 1.0.................................... 85 dB
Gain 10, 100.................................... 96 dB