Datasheet ADR512 (Analog Devices) - 9

link to page 8 link to page 9 link to page 9 link to page 9
Data Sheet ADR512 PRECISE NEGATIVE VOLTAGE REFERENCE
package). Since the cathode of the ADR512 is tied to ground, The ADR512 is suitable for use in applications where a precise the anode must be −1.2 V. negative voltage reference is desired, including the application R1 in Figure 14 should be chosen so that 100 μA to 10 mA is detailed in Figure 13. provided to properly bias the ADR512. Figure 14 shows the ADR512 configured to provide a −1.2 V V output. R DD 1 = (5) I The resistor R1 should be chosen so that power dissipation is at
+ ADR512
a minimum. An ideal resistor value can be determined through
–
manipulation of Equation 5.
–1.2V R2
014
–VDD
03700- 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 Rev. A | Page 9 of 12 Document Outline Features Applications Pin Configuration General Description Revision History Specifications Electrical Characteristics Absolute Maximum Ratings Thermal Resistance ESD Caution Typical Performance Characteristics Parameter Definitions Temperature Coefficient Thermal Hysteresis Applications Section Adjustable Precision Voltage Source Output Voltage Trim Using the ADR512 with Precision Data Converters Precise Negative Voltage Reference Outline Dimensions Ordering Guide