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REF200 Datasheet(PDF) 9 Page - Texas Instruments

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Part # REF200
Description  Dual Current Source and Current Sink
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

REF200 Datasheet(HTML) 9 Page - Texas Instruments

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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
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