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REF3140AIDBZT Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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REF3140AIDBZT Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 11 page REF3112, 3120, 3125, 3130, 3133, 3140 8 SBVS046A www.ti.com NOISE PERFORMANCE Typical 0.1Hz to 10Hz voltage noise can be seen in the Typical Characteristic Curve, 0.1 to 10Hz Voltage Noise. The noise voltage of the REF31xx 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 the 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 shown by the long-term stability curves. The typical drift value for the REF31xx is 70ppm from 0-1000 hours. This parameter is characterized by measuring 30 units at regular intervals for a period of 1000 hours. LOAD REGULATION Load regulation is defined as the change in output voltage due to changes in load current. The load regulation of the REF31xx is measured using force and sense contacts as pictured in Figure 4. The force and sense lines reduce the impact of contact and trace resistance, resulting in accurate measurement of the load regulation contributed solely by the REF31xx. For applications requiring improved load regula- tion, 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 REF31xx. APPLICATION CIRCUITS Negative Reference Voltage For applications requiring a negative and positive reference voltage, the REF31xx and OPA703 can be used to provide a dual supply reference from a ±5V supply. Figure 5 shows the REF3125 used to provide a ±2.5V supply reference voltage. The low drift performance of the REF31xx complement the low offset voltage and low drift of the OPA703 to provide an accurate solution for split-supply applications. OPA703 REF3125 +5V –5V +5V 10k Ω 10k Ω +2.5V –2.5V FIGURE 5. REF3125 Combined with OPA703 to Create Positive and Negative Reference Voltages. DATA ACQUISITION Data acquisition systems often require stable voltage references to maintain accuracy. The REF31xx family features stability and a wide range of voltages suitable for most micro- controllers and data converters. Figure 6, Figure 7, and Figure 8 show basic data acquisition systems. |
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