제품소개

Features
▷ The following specifications are typical at 25 °C, unless otherwise noted. For more
    information about the NI PCI-6221 (37-pin), refer to the M Series User Manual available at

Specification & Introduction
 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 
    DMA (scatter-gather), interrupts,
    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
 Settling Time for Multichannel Measurements
▷ Accuracy, full-scale step, all ranges
    ±90 ppm of step (±6 LSB) 
        4 μs convert interval
    ±30 ppm of step (±2 LSB) 
        5 μs convert interval
    ±15 ppm of step (±1 LSB) 
        7 μs convert interval

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