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XTR110BG Datasheet(PDF) 8 Page - Texas Instruments |
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XTR110BG Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 19 page  XTR110 8 SBOS141C www.ti.com FIGURE 6. Zero and Span of 0V to +10V Input, 4mA to 20mA Output Configuration (see Figure 5). FIGURE 7. Zero and Span of 0V to +10V IN, 0mA to 20mA Output Configuration (see Figure 5). at 0mA, the following special procedure is recommended: set the input to a small nonzero value and then adjust R1 to the proper output current. When the input is zero the output will be zero. Figures 6 and 7 show graphically how offset is adjusted. SPAN ADJUSTMENT The span is adjusted at the full-scale output current using the potentiometer, R2, shown in Figure 5. This adjustment is interactive with the offset adjustment, and a few iterations may be necessary. For the circuit shown, set the input voltage to +10V full scale and adjust R2 to give 20mA full- scale output. Figures 6 and 7 show graphically how span is adjusted. The values of R2, R3, and R4 for adjusting the span are determined as follows: choose R4 in series to slightly de- crease the span; then choose R2 and R3 to increase the span to be adjustable about the center value. LOW TEMPERATURE COEFFICIENT OPERATION Although the precision resistors in the XTR110 track within 1ppm/ °C, the output current depends upon the absolute temperature coefficient (TC) of any one of the resistors, R6, R7, R8, and R9. Since the absolute TC of the output current can have 20ppm/ °C, maximum, the TC of the output current can have 20ppm/ °C drift. For low TC operation, zero TC resistors can be substituted for either the span resistors (R6 or R7) or for the source resistor (R9) but not both. EXTENDED SPAN For spans beyond 40mA, the internal 50 Ω resistor (R 9) may be replaced by an external resistor connected between pins 13 and 16. Its value can be calculated as follows: REXT = R9 (SpanOLD/SpanNEW) Since the internal thin-film resistors have a 20% absolute value tolerance, measure R9 before determining the final value of REXT. Self-heating of REXT can cause nonlinearity. Therefore, choose one with a low TC and adequate power rating. See Figure 10 for application. FIGURE 5. Offset and Span Adjustment Circuit for 0V to +10V Input, 4mA to 20mA Output. 20 15 10 5 02468 10 Input Voltage, V IN1 (V) 0mA Offset Zero Adjust Span Adjust 20mA Span See values in Figure 6. In addition, connect pins 9 and 10 together. XTR110 15 1V to +5V Out 1 13 16 2 R 4 S G D + – 9 8 7 6 R 1 R 2 R 3 Span Adjust Offset Adjust 0V to +10V 4mA to 20mA Out R L 250 Ω 24V 1µF Tantalum Third Wire 14 12 3 4 5 20 15 10 5 02468 10 Input Voltage, V IN1 (V) 4mA Offset Zero Adjust ±1.8% of Span Span Adjust ±0.45% as shown 16mA Span R 1 = 100kΩ R 2 = 100kΩ R 3 = 49.9kΩ R 4 = 31.6Ω −2.5 |
Similar Part No. - XTR110BG |
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Similar Description - XTR110BG |
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