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ADR525 Scheda tecnica(PDF) 10 Page - Analog Devices |
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ADR525 Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 12 page ADR525/ADR530/ADR550 Rev. F | Page 10 of 12 Stacking the ADR525/ADR530/ADR550 for User-Definable Outputs Multiple ADR525/ADR530/ADR550 parts can be stacked to allow the user to obtain a desired higher voltage. Figure 18 shows three ADR550s configured to give 15 V. The bias resistor, RBIAS, is chosen using Equation 3; note that the same bias current flows through all the shunt references in series. Figure 19 shows three ADR550s stacked to give −15 V. RBIAS is calculated in the same manner as for Figure 18. Parts of different voltages can also be added together. For example, an ADR525 and an ADR550 can be added together to give an output of +7.5 V or −7.5 V, as desired. Note, however, that the initial accuracy error is now the sum of the errors of all the stacked parts, as are the temperature coefficients and output voltage change vs. input current. ADR550 +VDD +15V R ADR550 ADR550 GND Figure 18. +15 V Output with Stacked ADR550s ADR550 ADR550 ADR550 GND –15V R –VDD Figure 19. −15 V Output with Stacked ADR550s Adjustable Precision Voltage Source The ADR525/ADR530/ADR550, combined with a precision low input bias op amp, such as the AD8610, can be used to output a precise adjustable voltage. Figure 20 illustrates the implementation of this application using the ADR525/ADR530/ADR550. The output of the op amp, VOUT, is determined by the gain of the circuit, which is completely dependent on the resistors, R1 and R2. VOUT = VREF (1 + R2/R1) An additional capacitor, C1, in parallel with R2, can be added to filter out high frequency noise. The value of C1 is dependent on the value of R2. ADR5xx VS GND R R1 R2 C1 (OPTIONAL) VREF AD8610 VOUT = VREF (1+R2/R1) Figure 20. Adjustable Voltage Source |
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