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XTR101AP Datasheet(PDF) 10 Page - Texas Instruments |
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XTR101AP Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 25 page  XTR101 SBOS146A − OCTOBER 1986 − REVISED AUGUST 2004 www.ti.com 10 SIGNAL SUPPRESSION AND ELEVATION In some applications, it is desired to have suppressed zero range (input signal elevation) or elevated zero range (input signal suppression). This is easily accomplished with the XTR101 by using the current sources to create the suppression/elevation voltage. The basic concept is shown in Figure 7 and Figure 8(a). In this example, the sensor voltage is derived from RT (a thermistor, RTD, or other variable resistance element) and excited by one of the 1mA current sources. The other current source is used to create the elevated zero range voltage. Figure 8(b), (c), and (d) show some of the possible circuit variations. These circuits have the desirable feature of noninteractive span and suppression/elevation adjustments. Note: It is not recommended to use the optional offset voltage null (pins 1, 2, and 14) for elevation/suppression. This trim capability is used only to null the amplifier’s input offset voltage. In many applications the already low offset voltage (typically 20 µV) will not need to be nulled at all. Adjusting the offset voltage to non-zero values will disturb the voltage drift by ±0.3µV/°C per 100µV or induced offset. − 0+ 20 15 10 5 0 Elevated Zero Range Suppressed Zero Range Span Adjust e IN (V) Figure 7. Elevation and Suppression Graph − 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 × R4 e’ 2 =1mA × RT (a) Elevated Zero Range e IN =(e’2 +V4) V 4 =1mA × R4 e’ 2 =1mA × RT (b) Suppressed Zero Range e IN =(e’2 − V4) V 4 =2mA × R4 (c) Elevated Zero Range e IN =(e’2 +V4) V 4 =2mA × R4 (d) Suppressed Zero Range Figure 8. Elevation and Suppression Circuits APPLICATION INFORMATION The small size, low offset voltage and drift, excellent linearity, 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 manufacturers who gather transducer data. Current-mode transmission 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. |
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