Digital Input/Output - Measurement Computing USB-1208HS User Manual

USB-1208HS User's Guide
Range
±20 V (DIFF mode)
±10 V (DIFF mode)
±5 V (DIFF mode)
±10 V (SE mode)
±5 V (SE mode)
±2.5 V (SE mode)
0 – 10 V (SE mode)
Table 3 summarizes the noise performance for the USB-1208HS. Noise distribution is determined by gathering
50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum specified sample
rate of 1 MS/s.
Range
±20 V (DIFF mode)
±10 V (DIFF mode)
±5 V (DIFF mode)
±10 V (SE mode)
±5 V (SE mode)
±2.5 V (SE mode)
0 – 10 V (SE mode)
Condition
+ full-scale to –full-scale
channel switch, same range
to same range

Digital input/output

Parameter
Digital type
Number of I/O
Configuration
Pull-up configuration
Digital I/O transfer rate
(system-paced)
Input high voltage
Input low voltage
Output high voltage
Output low voltage
Output current
Table 2. Calibrated absolute accuracy
Accuracy (mV)
±9.55 typ, ±13.18 max
±4.59 typ, ±6.23 max
±2.25 typ, ±2.75 max
±5.10 typ, ±8.06 max
±2.63 typ, ±4.03 max
±1.59 typ, ±2.70 max
±3.29 typ, ±5.13 max
Table 3. Noise performance
Typical counts LSBrms
3 0.45
3 0.45
3 0.45
5 0.91
5 0.91
5 0.91
5 0.91
Table 4. Input settling time in µs, typical
Range ±1 LSB
±10 V 1.5
±5 V 2.1
±2.5 V 2.2
0 V to 10 V 2.6
Table 5. Digital I/O specifications
Specification
CMOS
16
Each bit may be configured as input (power on default) or output
The port has 47 kΩ resistors configurable as pull-up or pull-down with an internal
jumper. The default setting is pull-down.
33 to 8000 port reads/writes or single bit reads/writes per second typ, system dependent.
2.0 V min
5.5 V absolute max
0.8 V max
–0.5 V absolute min
0 V recommended min
4.4 V min (IOH = –50 µA)
3.76 V min (IOH = –24 mA)
0.1 V max (IOL = 50 µA)
0.44 V max (IOL = 24 mA)
±24 mA max per terminal (refer to Power section for additional information)
17
±4 LSB ±8 LSB
1.1 1.0
1.1 1.0
1.1 1.0
1.1 1.0
Specifications