Digital Input/Output - Measurement Computing WebDAQ 504 User Manual

WebDAQ 504 User's Guide
Parameter
Crosstalk
CMRR
SFDR
Input impedance
Note 1: If you are using an IEPE sensor, use this equation to make sure your configuration meets the IEPE compliance
voltage range
(V
common-mode
V
common-mode
V is the bias voltage of the IEPE sensor.
bias
V is the full-scale voltage of the IEPE sensor.
full-scale
Measurement Conditions
Calibrated
Note 2: Range = 5.1 V
Idle Channel
Noise
Noise density
Input Amplitude
Input amplitude
Intermodulation distortion
(–1 dBFS)

Digital input/output

Parameter
Digital type
Number of I/O
Configuration
Power on conditions
Pull-up configuration
Input frequency range
Input high voltage threshold
Input low voltage threshold
Schmitt trigger hysteresis
Condition
1 kHz
f ≤ 1 kHz
in
f = 1 kHz, –60 dBFS
in
Differential
AI– (shield) to chassis ground
+ V ± V ) must be 0 to 19, where
bias full-scale
is the common-mode voltage applied to the WebDAQ 504.
Table 2. Measurement accuracy specifications
Maximum
(0 °C to 50 °C)
Typical
(25 °C ±5 °C
.
pk
Table 3. Idle channel and noise density specifications
51.2 kS/s
97 dBFS
50 µV
rms
310 nV/√Hz
Table 4. Total harmonic distortion (THD) specifications
Condition
–1 dBFS
–20 dBFS
DIN 250 Hz/8 kHz
4:1 amplitude ratio
CCIF 11 kHz/12 kHz 1:1 amplitude
ratio
Table 5. Digital input/output specifications
Specification
CMOS (Schmitt trigger) input / open drain output
One port of 4 bits
Each bit can be independently configured for input or output
Power on reset is input mode
Each bit is pulled up to 5 V with a 100 kΩ resistor
DC – 10 kHz (Note 3)
1.9 V min, 3.6 V max
2.3 V max, 1.0 V min
0.6 V min, 1.7 V max
Specification
–110 dB
40 dB min
47 dB typ
120 dB
305 kΩ
50 Ω
Percent of Reading
(Gain Error)
±0.34% (±0.03 dB)
±0.07% (±0.006 dB)
25.6 kS/s
99 dBFS
40 µV
rms
350 nV/√Hz
Specification
1 kHz: –95 dB
8 kHz: –87 dB
1 kHz: –95 dB
8 kHz: –80 dB
–80 dB
–93 dB
21
Specifications
Percent of Range
(Offset Error) Note 2
±0.14% (±7.1 mV)
±0.01% (±0.5mV)
2.048 kS/s
103 dBFS
25 µV
rms
780 nV/√Hz