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Appendix A Specifications
©
National Instruments Corporation A-3 PCI-4451/4452 User Manual
Amplifier Characteristics
Input impedance.....................................1 MΩ in parallel with 50 pF
(+ and − each to AIGND)
Frequency response
Gain
0, +10, +20, +30, +40 dB................±0.1 dB, 0 to 95 kHz, 204.8 kS/s,
DC coupling
−20, −10, +50, +60 dB....................±1 dB, 0 to 95 kHz, ±0.1 dB,
0 to 20 kHz
−3 dB bandwidth.................................... 0.493 f
s
Input coupling........................................AC or DC, software-selectable
AC −3 dB cutoff frequency ............3.4 Hz
Common-mode range
Gain ≥0 dB...................................... both + and − should remain within
±12 V of AIGND
Gain < 0 dB.....................................both + and − should remain within
±42.4 V of AIGND
Overvoltage protection........................... ±42.4 V, powered on or off
(±400 V guaranteed by design,
but not tested or certified to
operate beyond ±42.4 V)
Inputs protected...............................ACH0, ACH1, ACH2, ACH3
Common mode rejection ratio
(f
in
< 1 kHz)............................................90 dB, Gain ≥0 dB
60 dB, Gain < 0 dB
User.book Page 3 Tuesday, April 14, 1998 10:20 AM