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REF200 Datasheet(PDF) 9 Page - Texas Instruments |
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REF200 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 34 page 100µA REF200 +5V 100µA 3 Wire RTD +5V R3 78.7 INA326 Vout R1 R2 + ± REF200 www.ti.com SBVS020B – SEPTEMBER 2000 – REVISED JULY 2015 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information Applications for the REF200 are limitless. Application Bulletin AB-165 (SBOA046) shows additional REF200 circuits as well as other related current source techniques. In this section, a collection of circuits are shown to illustrate some techniques. If the current sources are subjected to reverse voltage, a protection diode may be required. A reverse voltage circuit model of the REF200 is shown in Figure 6. If reverse voltage is limited to less than 6 V or reverse current is limited to less than 350 µA, then no protection circuitry is required. A parallel diode (see (a) in Figure 17) protects the device by limiting the reverse voltage across the current source to approximately 0.7 V. In some applications, a series diode may be preferable (see (b) in Figure 17), because it allows no reverse current. This configuration, however, reduces the compliance voltage range by one diode drop. 8.2 Typical Application Figure 11 shows the schematic of a circuit that translates RTD resistance to a voltage level convenient for an ADC input. The REF200 precision current reference provides excitation and an instrumentation amplifier scales the signal. The design also uses a 3-wire RTD configuration to minimize errors due to wiring resistance. Figure 11. RTD Resistance to Voltage Converter Schematic Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: REF200 |
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