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ADS803E1KG4 Datasheet(PDF) 10 Page - Texas Instruments |
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ADS803E1KG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page ADS803 10 SBAS074B www.ti.com 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 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. The top reference (REFT) and the bottom reference (REFB) are brought out mainly for external bypassing. For proper operation with all reference configurations, it is necessary to provide solid bypassing to the reference pins in order to keep the clock feedthrough to a minimum. Figure 5 shows the recommended decoupling network. 4V 1V IN IN SEL V REF +2.5V ext. V REF = 1V 1 + R 1 R 2 FSR = 2 • V REF ADS803 R 1 5k Ω +1.5V R 2 10k Ω FIGURE 5. Recommended Reference Bypassing Scheme. ADS803 CM REFB 0.1 µF 0.1 µF V REF 0.1 µF 10 µF + 0.1 µF REFT 0.1 µF 10 µF + FIGURE 6. Alternative Circuit to Generate CM Voltage. IN IN REFT R 1 CMV R 2 0.1 µF 0.1 µF ADS803 REFB In addition, the common-mode voltage (CMV) may be used as a reference level to provide the appropriate offset for the driving circuitry. However, care must be taken not to appreciably load this node, which is not buffered and has a high impedance. An alternate method of generating a common-mode voltage is given in Figure 6. Here, two external precision resistors (toler- ance 1% or better) are located between the top and bottom reference pins. The common-mode level will appear at the midpoint. The output buffers of the top and bottom reference are designed to supply approximately 2mA of output current. 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 inputs 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 |
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