Analog Input Module User Guide and Specifications

© National Instruments Corporation 19 NI USB-9234 User Guide and Specifications
Phase nonlinearity
(f
s
= 51.2 kS/s) ................................ ±0.45° max
Stopband
Frequency........................................ 0.55 · f
s
Rejection ......................................... 100 dB
Alias-free bandwidth.............................. 0.45 · f
s
Oversample rate ..................................... 64 · f
s
Crosstalk (1 kHz) ................................... –110 dB
CMRR (f
in
≤ 1 kHz)
Minimum ........................................ 40 dB
Typical ............................................ 47 dB
SFDR (f
in
= 1 kHz, –60 dBFS) .............. 120 dB
Idle channel noise and noise density
Input impedance
Differential...................................... 305 kΩ
AI– (shield) to chassis ground ........ 50 Ω
Total harmonic distortion (THD)
Intermodulation distortion (–1 dBFS)
DIN 250 Hz/8 kHz
4:1 amplitude ratio .......................... –80 dB
CCIF 11 kHz/12 kHz
1:1 amplitude ratio .......................... –93 dB
Idle Channel 51.2 kS/s 25.6 kS/s 2.048 kS/s
Noise 97 dBFS 99 dBFS 103 dBFS
50 μV
rms
40 μV
rms
25 μV
rms
Noise density 310 nV/√Hz 350 nV/√Hz 780 nV/√Hz
Input
Amplitude
1 kHz,
–40 to 70 °C
8 kHz,
–40 to 70 °C
–1 dBFS –95 dB –87 dB
–20 dBFS –95 dB –80 dB