Analog Output Calibration; Digital Input/Output; Synchronous Dac Load - Measurement Computing USB-3102 User Manual

USB-3102 User's Guide
Note 7: The maximum differential non-linearity specification applies to the entire 0 to 70 °C temperature range of the
USB-3102. 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.

Analog output calibration

Parameter
Recommended warm-up time
On-board precision reference
Calibration method
Calibration interval

Digital input/output

Parameter
Digital logic type
Number of I/O
Configuration
Pull-up/pull-down configuration
(Note 8)
Digital I/O input loading
Digital I/O transfer rate (system paced)
Input high voltage
Input low voltage
Output high voltage (IOH = –2.5 mA)
Output low voltage (IOL = 2.5 mA)
Power on and reset state
Note 8: Pull up and pull down configuration area available using the DIO CTL terminal block pin 54. The pull-down
configuration requires the DIO CTL pin (pin 54) to be connected to a DGND pin (pin 50, 53 or 55). For a
pull-up configuration, the DIO CTL pin should be connected to the +5V terminal pin (pin 56).

Synchronous DAC Load

Parameter
Pin name
Power on and reset state
Pin type
Termination
Software selectable direction
Input clock rate
Clock pulse width
Table 6. Analog output calibration specifications
Specifications
15 minutes min
DC level: 5.000 V ±1 mV max
Tempco: ±10 ppm/°C max
Long term stability: ±10 ppm/SQRT(1000 hrs)
Software calibration
1 year
Table 7. Digital I/O specifications
Specification
CMOS
8
Independently configured for input or output
User configurable
All pins floating (default)
TTL (default)
47 kΩ (pull-up/pull-down configurations)
System dependent, 33 to 1000 port reads/writes or single bit reads/writes per
second.
2.0 V min, 5.5 V absolute max
0.8 V max, –0.5 V absolute min
3.8 V min
0.7 V max
Input
Table 8. SYNCLD I/O specifications
Condition
Output
Input
Input
Output
17
Specification
SYNCLD (terminal block pin 49)
Input
Bidirectional
Internal 100K ohms pull-down
Outputs internal D/A LOAD signal.
Receives D/A LOAD signal from external source.
100 Hz max
1 µs min
5 µs min
Specifications