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XTR101AG Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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XTR101AG Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 15 page ® XTR101 9 40 – e IN e' 2 + 1mA 1mA – + R 4 V 4 2mA – + – + – + – + – + – + 2mA – + – + – + – + R T e' 2 R T e IN 1mA 1mA R 4 V 4 2mA e' 2 R 4 V 4 e IN 2mA e IN 2mA 2mA e' 2 R 4 V 4 e IN = (e'2 +V4) V 4 = 1mA X R 4 e' 2 = 1mA X RT (b) Suppressed Zero Range e IN = (e'2 –V4) V 4 = 1mA X R 4 e' 2 = 1mA X RT (a) Elevated Zero Range e IN = (e' 2 –V 4 ) V 4 = 2mA X R4 (c) Elevated Zero Range e IN = (e' 2 +V 4 ) V 4 = 2mA X R4 (d) Suppressed Zero Range FIGURE 8. Elevation and Suppression Circuits. APPLICATION INFORMATION The small size, low offset voltage and drift, excellent linear- ity, and internal precision current sources, make the XTR101 ideal for a variety of two-wire transmitter applications. It can be used by OEMs producing different types of transducer transmitter modules and by data acquisition systems manu- facturers who gather transducer data. Current mode trans- mission greatly reduces noise interference. The two-wire nature of the device allows economical signal conditioning at the transducer. Thus the XTR101 is, in general, very suitable for individualized and special purpose applications. EXAMPLE 1 RTD Transducer shown in Figure 9. Given a process with temperature limits of +25 °C and +150 °C, configure the XTR101 to measure the temperature with a platinum RTD which produces 100 Ω at 0°C and 200 Ω at +266°C (obtained from standard RTD tables). Transmit 4mA for +25 °C and 20mA for +150°C. COMPUTING RS: The sensitivity of the RTD is ∆R/∆T = 100Ω/266°C. When excited with a 1mA current source for a 25 °C to 150°C range (i.e., 125 °C span), the span of e IN is 1mA X (100Ω/266°C) X 125 °C = 47mV = ∆e IN. From equation 1, R S = RS = = = 123.3 Ω Span adjustment (calibration) is accomplished by trimming RS. COMPUTING R4: At +25 °C, e' 2 = 1mA (RT + ∆RT) = 1mA [100 Ω + X 25 °C] = 1mA (109.4 Ω) = 109.4mV In order to make the lower range limit of 25 °C correspond to the output lower range limit of 4mA, the input circuitry shown in Figure 9 is used. eIN, the XTR101 differential input, is made 0 at 25°C or e'2 25°C – V4 = 0 thus, V4 = e'2 25°C = 109.4mV R4 = = = 109.4 Ω COMPUTING R2 AND CHECKING CMV: At +25 °C, e' 2 = 109.4mV At +150 °C, e' 2 = 1mA (RT + ∆RT) = 1mA [100 Ω +( X 150 °C)] = 156.4mV Since both e'2 and V4 are small relative to the desired 5V common-mode voltage, they may be ignored in computing R2 as long as the CMV is met. R2 = 5V/2mA = 2.5kΩ e 2 min = 5V + 0.1094V e2 max = 5V + 0.1564V e1 = 5V + 0.1094V ∆I O/∆eIN – 0.016Ω 40 40 16mA/47mV – 0.016 266 °C 100Ω 1mA 109.4mV 1mA V 4 0.3244 266 °C 100Ω The +4V to +6V CMV requirement is met. – 0 + 20 15 10 5 0 Elevated Zero Range Suppressed Zero Range Span Adjust e IN (V) FIGURE 7. Elevation and Suppression Graph. |
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