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ADS803E1KG4 Datasheet(PDF) 9 Page - Texas Instruments |
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ADS803E1KG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page ADS803 9 SBAS074B www.ti.com V IN IN IN CM 22 Ω 22 Ω 100pF R T 100pF + 4.7 µF 0.1 µF ADS803 1:n 0.1 µF R G REFERENCE OPERATION Integrated into the ADS803 is a bandgap reference circuit including logic that provides either a +1V or +2.5V reference output by simply selecting the corresponding pin-strap con- figuration. Different reference voltages can be generated by the use of two external resistors, which will set a different gain for the internal reference buffer. For more design flexibil- ity, the internal reference can be shut off and an external reference voltage used. Table I provides an overview of the possible reference options and pin configurations. FIGURE 3. Transformer-Coupled Input INPUT FULL-SCALE REQUIRED MODE RANGE VREF CONNECT TO Internal 2Vp-p +1V SEL VREF Internal 5Vp-p +2.5V SEL GND Internal 2V ≤ FSR < 5V 1V < VREF < 2.5V R1 VREF and SEL FSR = 2 x VREF VREF = 1 + (R1/R2)R2 SEL and GND External 1V < FSR < 5V 0.5V < VREF < 2.5V SEL +VS VREF Ext. VREF TABLE I. Selected Reference Configuration Examples. 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 that 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 ADS803 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 approximately 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. FIGURE 4. Equivalent Reference Circuit. 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 to A/D ADS803 |
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