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ADS803 Datasheet(PDF) 11 Page - Burr-Brown (TI) |
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ADS803 Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 12 page 11 ® ADS803 3.5V 1.5V IN IN +1V SEL V REF +2.5V ext. ADS803 V IN V IN 5V 0V IN IN +2.5V SEL V REF ADS803 FIGURE 10. External Reference, Input Range 0.5V to 4.5V (4Vp-p), with +2.5V Common-Mode Voltage. FIGURE 8. Internal Reference with 1.5V to 3.5V Input Range. FIGURE 9. Internal Reference with 1V to 4V Input Range. FIGURE 7. Internal Reference with 0V to 5V Input Range. SELECTING THE INPUT RANGE AND REFERENCE Figures 7 through 9 show a selection of circuits for the most common input ranges when using the internal reference of the ADS803. All examples are for single-ended input and operate with a nominal common-mode voltage of +2.5V. EXTERNAL REFERENCE OPERATION Depending on the application requirements, it might be advantageous to operate the ADS803 with an external refer- ence. This may improve the DC accuracy if the external reference circuitry is superior in its drift and accuracy. To use the ADS803 with an external reference, the user must disable the internal reference (see Figure 10). By connecting the SEL pin to +VS, the internal logic will shut down the internal reference. At the same time, the output of the internal reference buffer is disconnected from the VREF pin, which now must be driven with the external reference. Note that a similar bypassing scheme should be maintained as described for the internal reference operation. DIGITAL INPUTS AND OUTPUTS Over Range (OVR) One feature of the ADS803 is its ‘Over Range’ digital output (OVR). This pin can be used to monitor any out-of-range condition, which occurs every time the applied analog input voltage exceeds the input range (set by VREF). The OVR output is LOW when the input voltage is within the defined input range. It becomes HIGH when the input voltage is beyond the input range. This is the case when the input voltage is either below the bottom reference voltage or above the top reference voltage. OVR will remain active until the analog input returns to its normal signal range and another conversion is completed. Using the MSB and its complement in conjunction with OVR, a simple clue logic can be built that detects the overrange and underrange conditions (see Figure 11). It should be noted that OVR is a digital output which is updated along with the bit informa- tion corresponding to the particular sampling incidence of the analog signal. Therefore, the OVR data is subject to the same pipeline delay (latency) as the digital data. 4V 1V IN IN SEL V REF +2.5V ext. V REF = 1V 1 + R 1 R 2 FSR = 2 x V REF ADS803 R 1 5k Ω +1.5V R 2 10k Ω 4.5V 0.5V IN IN +2.5V ext. SEL V REF 1.24k Ω 4.99k Ω 0.1 µF 10 µF REF1004 +2.5V + ADS803 +5V V IN +2V DC |
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