Parametrics, Noise performance – Measurement Computing PCI-DAS6071 User Manual
Page 38
PCI-DAS6071 User's Guide
Specifications
38
Parametrics
Table 7. Parametric specifications
Parameter
Specification
Max working voltage
(signal + common-mode)
Input must remain within ±11 V of ground
CMRR @ 60 Hz
±10 V:
95 dB
±5 V, 0 to 10 V:
100 dB
All other ranges:
106 dB
Small signal bandwidth, all ranges
1.6 MHz
Large signal bandwidth, all ranges
1.0 MHz
Input coupling
DC
Input impedance
100 GΩ in parallel with 100pF in normal operation.
Input bias current
±200 pA
Input offset current
±100 pA
Absolute maximum input voltage
Power ON: ±25 V, Power OFF: ±15 V (±20 mA Note 3)
Protected inputs:
CH<63:0> IN
AISENSE
Power on and reset state
CH0 IN, single-ended mode, 0 V to 0.1 V input range (Note 4)
Crosstalk, DC to 100 kHz
Adjacent channels: –75 dB
All other channels: –90 dB
Note 3:
The analog input sink/source current must be limited to an maximum of ±20 mA in the power OFF
state to prevent damage to the board. A 1000 Ω (¼ W) current limiting resistor should be placed in
series with each analog input channel being used in applications where the power OFF state
sink/source current into the board can exceed ±20 mA. Resistance values >1000 Ω may adversely
affect the noise and settling time performance of the board.
Note 4:
Care should be taken to avoid the application of an input voltage to CH0 IN that could overdrive the
analog input circuit. Any unused analog input channel should be connected to LLGND.
Noise Performance
Table 8 summarizes the noise performance for the PCI-DAS6071. Noise distribution is determined by gathering
50K samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified
single-channel sampling rate. Specification applies to both single-ended and differential modes of operation.
Table 8. Analog input noise performance specifications (not including quantization)
Range
Counts
Dithered
LSBrms
Dithered
Counts
Undithered
LSBrms
Undithered
±10 V
5
0.5
3
0.25
±5 V
5
0.5
3
0.25
±2.5 V
5
0.5
3
0.25
±1 V
5
0.5
3
0.25
±500 mV
6
0.5
3
0.25
±250 mV
6
0.6
4
0.4
±100 mV
7
0.7
5
0.5
±50 mV
9
0.9
8
0.8
0 to 10 V
5
0.5
3
0.25
0 to 5 V
5
0.5
3
0.25
0 to 2 V
5
0.5
3
0.25
0 to 1 V
6
0.5
3
0.25
0 to 500 mV
6
0.6
4
0.4
0 to 200 mV
7
0.7
5
0.5
0 to 100 mV
9
0.9
8
0.8