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© National Instruments Corporation 7 SCC-LP Series Lowpass Filter Modules User Guide
Input bias current ................................... ±2 nA typ
±5 nA max
1
Nonlinearity ........................................... 0.004% of full scale
Filter Characteristics
Filter type ............................................... Fourth-order Butterworth
lowpass
Rolloff rate ............................................. 80 dB/decade
–3 dB cutoff frequency (fc)
SCC-LP01....................................... 25 Hz
SCC-LP02....................................... 50 Hz
SCC-LP03....................................... 150 Hz
SCC-LP04....................................... 1 kHz
Passband ripple
System Noise
Total harmonic distortion (THD) at fc ... < –90 dB
Wide-band noise
(DC to 1 MHz, RTI)............................... 100 µV
rms
Narrow-band noise
(DC to 33 kHz, RTI) .............................. 6 µV
rms
1
Applicable at 25 °C.
Input Signal Typical Maximum
DC to 1/3 fc ±0.04 dB 0 ± 0.1 dB
DC to 1/2 fc ±0.06 dB 0 ± 0.2 dB
DC to 2/3 fc –0.2 ± 0.25 dB –0.2 ± 0.4 dB
DC to fc –3 ± 0.3 dB –3 ± 0.5 dB