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ADC0800PCD Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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ADC0800PCD Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 10 page  Typical Applications (Continued) TESTING THE AD CONVERTER There are many degrees of complexity associated with test- ing an AD converter One of the simplest tests is to apply a known analog input voltage to the converter and use LEDs to display the resulting digital output code as shown in Fig- ure 3 Note that the LED drivers invert the digital output of the AD converter to provide a binary display A lab DVM can be used if a precision voltage source is not available After adjusting the zero and full-scale any number of points can be checked as desired For ease of testing a 1024 VDC reference is recommended for the AD converter This provides an LSB of 40 mV (10240256) To adjust the zero of the AD an analog input voltage of LSB or 20 mV should be applied and the zero adjust potentiometer should be set to provide a flicker on the LSB LED readout with all the other display LEDs OFF To adjust the full-scale adjust potentiometer an analog in- put that is 1 LSB less than the reference (10240 – 0060 or 10180 VDC) should be applied to the analog input and the full-scale adjusted for a flicker on the LSB LED but this time with all the other LEDs ON A complete circuit for a simple AD tester is shown in Figure 4 Note that the clock input voltage swing and the digital output voltage swings are from 0V to 1024V The MM74C901 provides a voltage translation to 5V operation and also the logic inversion so the readout LEDs are in bina- ry TLH5670 – 15 FIGURE 3 Basic AD Tester TLH5670 – 7 FIGURE 4 Complete Basic Tester Circuit 7 |
Similar Part No. - ADC0800PCD |
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Similar Description - ADC0800PCD |
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