PCI-6221 M Series Data Acquisition Equipment

PCI-6221 M Series Data Acquisition Equipment

Analog Input
Number of channels 8 differential or 16 single ended
ADC resolution 16 bits
DNL No missing codes guaranteed
INL Refer to the AI Absolute Accuracy section
Sample rate
Single channel maximum 250 kS/s
Multichannel maximum (aggregate) 250 kS/s
Minimum No minimum
Timing accuracy 50 ppm of sample rate
Timing resolution 50 ns
Input coupling DC
Input range ±0.2 V, ±1 V, ±5 V, ±10 V
Maximum working voltage for analog
inputs (signal + common mode)
±11 V of AI GND
CMRR (DC to 60 Hz) 92 dB
Input impedance
Device on
AI+ to AI GND >10 GΩ in parallel with 100 pF
AI- to AI GND >10 GΩ in parallel with 100 pF

Device off
AI+ to AI GND 820 Ω
AI- to AI GND 820 Ω
Input bias current ±100 pA
Crosstalk (at 100 kHz)
Adjacent channels -75 dB
Non-adjacent channels -90 dB
Small signal bandwidth (-3 dB) 700 kHz
Input FIFO size 4,095 samples
Scan list memory 4,095 entries
Data Transfers
PCI/PXI DMA (scatter-gather), interrupts,
programmed I/O
USB USB Signal Stream, programmed I/O
Overvoltage protection for all analog input and sense channels
Device on ±25 V for up to two AI pins
Device off ±15 V for up to two AI pins
Input current during overvoltage condition ±20 mA maximum/AI pin