Measurement Computing PCIM-DDA06/16, User Manual, Page: 10 / 14

10
Chapter 3
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog output
Table 1. Analog output specifications
Parameter Specification
D/A converter type AD660BR
Resolution 16 bits
Number of channels 6
Voltage ranges ±10 V, ±5, 0 to 10 V, 0 to 5 V. Ranges are switch selectable
D/A pacing Software paced
Throughput System-dependent. Using the Universal Library programmed output
function (
cbAOut()
) in a loop, in Visual Basic, a typical update rate
of 150 kHz (± 70 nS jitter) can be expected. The rate was measured on
a 500 MHz Pentium III based PC.
Data transfer Programmed I/O
Monotonicity 15 bits guaranteed over temperature
Slew rate 1.7 V/µs min, 2.4 V/µS typ
Current drive ±5 mA min
Output short-circuit duration Indefinite
Power-on reset voltage 0 V ±15 mV
Miscellaneous Double buffered output latches
Update DACs individually or simultaneously (jumper selectable)
Accuracy
Table 2. Analog output accuracy specifications
Parameter Specification
Absolute accuracy ±2.0 LSB max
Typical accuracy ±1.0 LSB max
Gain error Trimmable by potentiometer to 0
Offset error Trimmable by potentiometer to 0
Integral linearity error ±1.0 LSB max, ±0.5 LSB typ
Differential linearity error ±1.0 LSB max, ±0.5 LSB typ
Each PCIM-DDA06/16 is tested at the factory to assure the board’s overall error does not exceed ±2.0 LSB.
Total board error is a combination of gain, offset, integral linearity and differential linearity error. The
theoretical worst-case error of the board may be calculated by summing these component errors. Worst case
error is realized only in the unlikely event that each of the component errors are at their maximum level and
causing error in the same direction.
Typical accuracy is derived directly from the various component typical errors. This typical, maximum error
calculation for the PCIM-DDA06/16 yields ±1.0 LSB.