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REF3230 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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REF3230 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 15 page REF3212,REF3220 REF3225,REF3230 REF3233,REF3240 SBVS058B −JUNE 2005 − REVISED FEBRUARY 2006 www.ti.com 10 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 Typical Characteristic curves. The typical drift value for the REF32xx is 55ppm from 0 to 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 as a result of changes in load current. The load regulation of the REF32xx is measured using force and sense contacts, as shown in Figure 4. The force and sense lines can be used to effectively eliminate the impact of contact and trace resistance, resulting in accurate voltage at the load. By connecting the force and sense lines at the load, the REF32xx compensates for the contact and trace resistances because it measures and adjusts the voltage actually delivered at the load. 1 2 3 6 5 4 R LOAD 0.47 µF +5V GND_F Contact and Trace Resistance GND_S SHDN OUT_F OUT_S IN REF32xx Figure 4. Accurate Load Regulation of REF32xx APPLICATION CIRCUITS NEGATIVE REFERENCE VOLTAGE For applications requiring a negative and positive reference voltage, the REF32xx and OPA735 can be used to provide a dual-supply reference from a ±5V supply. Figure 5 shows the REF3225 used to provide a ±2.5V supply reference voltage. The low drift performance of the REF32xx complements the low offset voltage and zero drift of the OPA735 to provide an accurate solution for split-supply applications. Care must be taken to match the temperature coefficients of R1 and R2. −2.5V +2.5V +5V 1 2 5 6 34 NOTE: Bypass capacitor is not shown. R 1 10k Ω R 2 10k Ω −5V +5V OPA735 REF3225 Figure 5. REF3225 Combined with OPA735 to Create Positive and Negative Reference Voltages DATA ACQUISITION Data acquisition systems often require stable voltage references to maintain accuracy. The REF32xx family features stability and a wide range of voltages suitable for most microcontrollers and data converters. Figure 6, Figure 7, and Figure 8 show basic data acquisition systems. |
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Similar Description - REF3230 |
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