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ADR512 데이터시트(PDF) 9 Page - Analog Devices |
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ADR512 데이터시트(HTML) 9 Page - Analog Devices |
9 / 12 page Data Sheet ADR512 Rev. A | Page 9 of 12 PRECISE NEGATIVE VOLTAGE REFERENCE The ADR512 is suitable for use in applications where a precise negative voltage reference is desired, including the application detailed in Figure 13. Figure 14 shows the ADR512 configured to provide a −1.2 V output. ADR512 –1.2V –VDD R2 + – Figure 14. Precise −1.2 V Reference Configuration Since the ADR512 characteristics resemble those of a Zener diode, the cathode shown in Figure 14 will be 1.2 V higher with respect to the anode (V+ with respect to V− on the ADR512 package). Since the cathode of the ADR512 is tied to ground, the anode must be −1.2 V. R1 in Figure 14 should be chosen so that 100 μA to 10 mA is provided to properly bias the ADR512. I V R DD = 1 (5) The resistor R1 should be chosen so that power dissipation is at a minimum. An ideal resistor value can be determined through manipulation of Equation 5. |
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