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XTR116UAE4 Datasheet(PDF) 5 Page - Texas Instruments |
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XTR116UAE4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 13 page XTR115, XTR116 5 SBOS124A www.ti.com APPLICATIONS INFORMATION The XTR115 and XTR116 are identical devices except for the reference voltage output, pin 1. This voltage is available for external circuitry and is not used internally. Further discussions that apply to both devices will refer to the “XTR115/6.” Figure 1 shows basic circuit connections with representative simplified input circuitry. The XTR115/6 is a two-wire current transmitter. Its input signal (pin 2) controls the output current. A portion of this current flows into the V+ power supply, pin 7. The remaining current flows in Q1. External input circuitry connected to the XTR115/6 can be powered from VREG or VREF. Current drawn from these terminals must be returned to IRET, pin 3. This IRET pin is a “local ground” for input circuitry driving the XTR115/6. The XTR115/6 is a current-input device with a gain of 100. A current flowing into pin 2 produces IO = 100 • IIN. The input voltage at the IIN pin is zero (referred to the IRET pin). A voltage input is created with an external input resistor, as shown. Common full-scale input voltages range from 1V and upward. Full-scale inputs greater than 0.5V are recom- mend to minimize the effect of offset voltage and drift of A1. EXTERNAL TRANSISTOR The external transistor, Q1, conducts the majority of the full- scale output current. Power dissipation in this transistor can approach 0.8W with high loop voltage (40V) and 20mA output current. The XTR115/6 is designed to use an external transistor to avoid on-chip thermal-induced errors. Heat produced by Q1 will still cause ambient temperature changes that can affect the XTR115/6. To minimize these effects, locate Q1 away from sensitive analog circuitry, including XTR115/6. Mount Q1 so that heat is conducted to the outside of the transducer housing. The XTR115/6 is designed to use virtually any NPN transis- tor with sufficient voltage, current and power rating. Case style and thermal mounting considerations often influence the choice for any given application. Several possible choices are listed in Figure 1. A MOSFET transistor will not improve the accuracy of the XTR115/6 and is not recommended. R IN 20k Ω I IN 2 V IN I RET 3 XTR115 XTR116 +5V Regulator R 2 25 Ω R LIM E 5 I O 4 B 6 V+ 7 R 1 2.475k Ω R L V LOOP A1 Voltage Reference V REG 5V V REF (1) 8 1 XTR115: 2.5V XTR116: 4.096V Possible choices for Q 1 (see text). 2N4922 TIP29C TIP31B TYPE TO-225 TO-220 TO-220 PACKAGE I = 100 • I IN I O 10nF I REF I IN All return current from I REG and IREF For I O = 4mA to 20mA I IN = 40µA to 200µA With R IN = 20kΩ V IN = 0.8V to 4V I REG Q 1 Input Circuitry NOTE: (1) See also Figure 5. FIGURE 1. Basic Circuit Connections. |
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