Measurement Computing PC-CARD-DAC08 - Manual (Page 16)

Chapter 5
Specifications
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog output
Table 1. Analog output specifications
D/A converter type MAX547 13-bit Octal MDAC
Resolution 12 bits. LSB of converter not used.
Number of channels Eight voltage output, Single-ended
Output Range ±5V. 1 LSB = 2.44 mV
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
50 KHz (±3 KHz) can be expected. This rate was measured on a 500 MHz
Pentium III based PC running under Windows 98.
Data transfer Programmed I/O
D/A trigger modes Software
Slew rate ± 1.6 V/µS min
Settling time (to ½ LSB of FSR) 8.0 µS typical
Current drive ±1 mA min
Output short-circuit duration Indefinite @ 15 mA
Output coupling DC
Output impedance 0.1 Ω max
Miscellaneous
ƒ Double buffered output latches
ƒ Update in DAC pairs (for example DAC 0/1, 2/3...) or all DACs
simultaneously
ƒ Coding: Offset Binary (0 code = -FS, 4095 code = +FS)
ƒ Power up and reset, all DAC's cleared to 0 V, ± 10.2 mV typical
ƒ 'CLEAR' command to reset all DAC's to 0 V, ± 10.2mV typical in
software
Accuracy
Table 2. Analog output accuracy specifications
Absolute Accuracy (SW calibrated) ±4.0 LSB
Typical Accuracy (SW calibrated) ±1.8 LSB
Accuracy components (uncalibrated)
Table 3. Accuracy component specifications
Gain Error Offset Error DLE ILE
±40 max, ±20.0 typical ±12.0 max, ±3.0 typical ±0.5 max, ±0.3 typical ±2 max, 0.5 typical
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. Each PC-CARD-DAC08 is tested at the factory to assure the board’s
overall software-calibrated error does not exceed ±4.0 LSB.
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