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ADS804 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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ADS804 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 18 page ADS804 10 SBAS068B www.ti.com ADS804 CM REFB 0.1 µF 0.1 µF VREF 0.1 µF 10 µF + 0.1 µF REFT 0.1 µF 10 µF + FIGURE 5. Recommended Reference Bypassing Scheme. A simple model of the internal reference circuit is shown in Figure 4. The internal blocks are a 1V-bandgap voltage reference, buffer, the resistive reference ladder, and the drivers for the top and bottom reference which supply the necessary current to the internal nodes. As shown, the output of the buffer appears at the VREF pin. The full-scale input span of the ADS804 is determined by the voltage at VREF, according to equation (1): Full-Scale Input Span = 2 • VREF (1) Note that the current drive capability of this amplifier is limited to about 1mA and should not be used to drive low loads. The programmable reference circuit is controlled by the voltage applied to the select pin (SEL). Refer to Table I for an overview. 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. 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 appre- ciably 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 preci- sion resistors (tolerance 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. FIGURE 6. Alternative Circuit to Generate Common-Mode Voltage. FIGURE 4. Equivalent Reference Circuit. IN IN REFT R 1 CMV R 2 0.1 µF 0.1 µF ADS804 REFB 800 Ω 800 Ω REFB CM Reference Driver Bandgap and Logic REFT V REF SEL 1V DC Resistor Network and Switches Disable Switch to A/D Converter to A/D Converter ADS804 |
Số phần tương tự - ADS804_14 |
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Mô tả tương tự - ADS804_14 |
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