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MC1408-8D Scheda tecnica(PDF) 6 Page - ON Semiconductor |
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MC1408-8D Scheda tecnica(HTML) 6 Page - ON Semiconductor |
6 / 9 page MC1408−8 http://onsemi.com 6 Output Voltage Range The voltage at Pin 4 must always be at least 4.5 V more positive than the voltage of the negative supply (Pin 3) when the reference current is 2.0 mA or less, and at least 8 V more positive than the negative supply when the reference current is between 2.0 mA and 4.0 mA. This is necessary to avoid saturation of the output transistors, which would cause serious degradation of accuracy. ON Semiconductor’s MC1408−8 does not need a range control because the design extends the compliance range down to 4.5 V (or 8.0 V−see above) above the negative supply voltage without significant degradation of accuracy. ON Semiconductor’s MC1408−8 can be used in sockets designed for other manufacturers’ MC1408 without circuit modification. Output Current Range Any time the full−scale current exceeds 2.0 mA, the negative supply must be at least 8.0 V more negative than the output voltage. This is due to the increased internal voltage drops between the negative supply and the outputs with higher reference currents. Accuracy Absolute accuracy is the measure of each output current level with respect to its intended value, and is dependent upon relative accuracy, full−scale accuracy and full−scale current drift. Relative accuracy is the measure of each output current level as a fraction of the full−scale current after zero−scale current has been nulled out. The relative accuracy of the MC1408−8 is essentially constant over the operating temperature range because of the excellent temperature tracking of the monolithic resistor ladder. The reference current may drift with temperature, causing a change in the absolute accuracy of output current; however, the MC1408−8 has a very low full−scale current drift over the operating temperature range. The MC1408−8 series is guaranteed accurate to within ±1/2 LSB at +25 °C at a full−scale output current of 1.99 mA. The relative accuracy test circuit is shown in Figure 5. The 12−bit converter is calibrated to a full−scale output current of 1.99219 mA; then the MC1408−8’s full−scale current is trimmed to the same value with R14 so that a zero value appears at the error amplifier output. The counter is activated and the error band may be displayed on the oscilloscope, detected by comparators, or stored in a peak detector. Two 8−bit D−to−A converters may not be used to construct a 16−bit accurate D−to−A converter. 16−bit accuracy implies a total of ±1/2 part in 65,536, or ±0.00076%, which is much more accurate than the ±0.19% specification of the MC1408−8. MSB A1 A2 A3 A4 A5 A6 A7 A8A9A10A11 A12 12-BIT D-TO-A CONVERTER ERROR MAX) 0 TO +10V OUTPUT ERROR (1V = 1%) NE530 LSB 5 6 7 8 9 10 11 12 MSB LSB MC1408 8-BIT COUNTER 15 16 3 2 1 4 14 13 − + C ( ±0.02% VCC VREF = 2V VEE 0.1 mF R14 Figure 5. Relative Accuracy 5k W 50k W 1k W 100 W 950 W |
Codice articolo simile - MC1408-8D |
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Descrizione simile - MC1408-8D |
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