Analog Current Output - Measurement Computing USB-3106 User Manual

USB-3106 User's Guide
Note 3: The duration of this output transient is highly dependent on the enumeration process of the host PC. Typically
the output of the device is stable after 2 seconds.
Note 4: The maximum differential non-linearity specification applies to the entire 0 to 50 °C temperature range of the
USB-3106. This specification also accounts for the maximum errors due to the software calibration algorithm
(in Calibrated mode only) and the DAC8554 digital to analog converter non-linearities.
Range Accuracy (±LSB)
±10 V 14.0
0 to 10 V 22.0
Table 3. Absolute accuracy components specifications – calibrated output
Range % of reading
±10 V ±0.0183
0 to 10 V ±0.0183
Range
±10 V , 0 to 10 V

Analog current output

Parameter
Number of channels
(Note 5)
Resolution
Output ranges
Compliance voltage range
(Note 6)
Differential non-linearity (Note 7)
Absolute accuracy
IOUTx leakage current
Settling time
Throughput
Note 5: Each of the four DAC8554 outputs controls a VOUTx and IOUTx channel-pair simultaneously. So, for
example, when writing to channel VOUT0, the associated IOUT0 channel will also be updated. Conversely,
when writing to channel IOUT0, the associated VOUT0 channel is also updated. Unused VOUTx and IOUTx
output channels should be left disconnected.
Note 6: The following formula will calculate the maximum load resistance for correct IOUT circuit operation. The
compliance voltage applied should not exceed the limits specified in Table 5.
Calibrated Output: Load Resistance = (Compliance Voltage – 6 V)/0.020 A
Un-Calibrated Output: Load Resistance = (Compliance Voltage – 6 V)/0.025 A
Table 2. Absolute accuracy specifications – calibrated output
Offset (±mV)
1.831
0.915
Table 4. Relative accuracy specifications
Relative accuracy (±LSB)
4.0 typ
Table 5. Analog current output specifications
Condition
Calibrated
Uncalibrated
Calibrated output
Calibrated
Un-calibrated
Compliance voltage = +13V
Resistive load = 100Ω
All zeros written to IOUTx
channel
Full scale step to 1LSB accuracy
Compliance voltage = 12V,
Rload = 500Ω
Single-channel
Multi-channel
Temp drift (%/°C) Absolute accuracy at FS (±mV)
0.00055 3.661
0.00055 2.746
12.0 max
Specification
16
16 bits
0 to 20 mA typ
0 to 25 mA typ
+8 V min
+36 V max
±1.25 LSB typ
-2 LSB to +1 LSB max
±0.25 LSB typ
-1 LSB to +1 LSB max
±0.05% of full scale range
100nA typ (each individual IOUT
channel)
25 µS typ
100 Hz max, system dependent
100 Hz/#ch max, system dependent
16
Specifications