Analog Input
Input Characteristics
Number of channels ........................ 4 pseudodifferential
Type of ADC
Resolution
NI 6115 .................................. 12 bits, 1 in 4,096
NI 6120 .................................. 16 bits, 1 in 65,536
Pipeline
NI 6115 .................................. 2
NI 6120 .................................. 0
Sampling rate
Maximum
NI 6115 .................................. 10 million S/s
NI 6120 .................................. 800 kS/s
Minimum
NI 6115 .................................. 20 kS/s
NI 6120 .................................. No minimum
Input impedance
AI + to AI –
Range ≤ ±10 V....................... 1 MΩ in parallel with
100 pF
Range > ±10 V....................... 10 kΩ in parallel with
40 pF
AI – to AI GND
NI 6115 .................................. 100 GΩ in parallel with
10 nF
NI 6120 .................................. 100 GΩ in parallel with
100 pF
AI + to AI GND
NI 6115...................................100 GΩ in parallel with
100 pF
NI 6120...................................100 GΩ in parallel with
100 pF
Input bias current.............................±300 pA
Input offset current ..........................±200 pA
Input coupling .................................DC/AC
Max working voltage for all analog input channels
Positive input (AI +) ...................±42 V for ±20 V and
±42 V ranges;
±11 V for other ranges
Negative input (AI –)..................±2.5 V
Overvoltage protection
(AI +, AI –)......................................±42 V
Input current during
overvoltage conditions ....................±20 mA max
Input FIFO size................................16 or 32 MS
Data transfers...................................DMA, interrupts,
programmed I/O
DMA mode......................................Scatter-gather
