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ADC0800PCD bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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ADC0800PCD bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
9 / 10 page Typical Applications (Continued) A low speed ramp generator can also be used to sweep the analog input voltage and the LED outputs will provide a bi- nary counting sequence from zero to full-scale The techniques described so far are suitable for an engi- neering evaluation or a quick check on performance For a higher speed test system or to obtain plotted data a digital- to-analog converter is needed for the test set-up An accu- rate 10-bit DAC can serve as the precision voltage source for the AD Errors of the AD under test can be provided as either analog voltages or differences in two digital words A basic AD tester which uses a DAC and provides the error as an analog output voltage is shown in Figure 6 The2op amps can be eliminated if a lab DVM with a numerical sub- traction feature is available to directly readout the difference voltage ‘‘A – C’’ For operation with a microprocessor or a computer-based test system it is more convenient to present the errors digi- tally This can be done with the circuit of Figure 7 where the output code transitions can be detected as the 10-bit DAC is incremented This provides LSB steps for the 8-bit AD under test If the results of this test are automatically plotted with the analog input on the X axis and the error (in LSB’s) as the Y axis a useful transfer function of the AD under test results For acceptance testing the plot is not neces- sary and the testing speed can be increased by establishing internal limits on the allowed error for each code All R’se005% tolerance TLH5670 – 16 FIGURE 6 AD Tester with Analog Error Output TLH5670 – 17 FIGURE 7 Basic ‘‘Digital’’ AD Tester Connection Diagram Dual-In-Line Package TLH5670 – 9 Top View Order Number ADC0800PD or ADC0800PCD See NS Package Number D18A 9 |
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