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REF3012 Datasheet(PDF) 9 Page - Texas Instruments |
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REF3012 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 17 page  REF3012, 3020, 3025, 3030, 3033, 3040 9 SBVS032F www.ti.com NOISE PERFORMANCE The REF30xx generates noise less than 50 µVp-p between frequencies of 0.1Hz to 10Hz, and can be seen in the Typical Characteristic Curve “0.1 to 10Hz Voltage Noise.” The noise voltage of the REF30xx increases with output voltage and operating temperature. Additional filtering may be used to improve output noise levels, although care should be taken to ensure the output impedance does not degrade AC performance. LONG TERM STABILITY Long term stability refers to the change of the output voltage of a reference over a period of months or years. This effect lessens as time progresses as is apparent by the long term stability curves. The typical drift value for the REF30xx is 24ppm from 0-1000 hours, and 15ppm from 1000-2000 hours. This parameter is characterized by measuring 30 units at regular intervals for a period of 2000 hours. LOAD REGULATION Load regulation is defined as the change in output voltage due to changes in load current. Load regulation for the REF30xx is measured using force and sense contacts as pictured in Figure 4. The force and sense lines tied to the contact area of the output pin reduce the impact of contact and trace resistance, resulting in accurate measurement of the load regulation contributed solely by the REF30xx. For applications requiring improved load regulation, force and sense lines should be used. Output Pin Meter V OUT + – Sense Line Force Line Load I L Contact and Trace Resistance FIGURE 4. Accurate Load Regulation of REF30xx. APPLICATION CIRCUITS Negative Reference Voltage For applications requiring a negative and positive reference voltage, the OPA703 and REF30xx can be used to provide a dual supply reference from a ±5V supply. Figure 5 shows the REF3025 used to provide a ±2.5V supply reference voltage. The low offset voltage and low drift of the OPA703 complement the low drift performance of the REF30xx to provide an accurate solution for split-supply applications. OPA703 REF3025 +5V –5V +5V 10k Ω 10k Ω +2.5V –2.5V FIGURE 5. REF3025 Combined with OPA703 to Create Positive and Negative Reference Voltages. DATA ACQUISITION Often data acquisition systems require stable voltage references to maintain necessary accuracy. The REF30xx family features stability and a wide range of voltages suitable for most micro-controllers and data converters. Figure 6 and Figure 7 show two basic data acquisition systems. |
Similar Part No. - REF3012_15 |
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Similar Description - REF3012_15 |
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