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XTR101AUG4 Datasheet(PDF) 6 Page - Texas Instruments |
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XTR101AUG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 26 page XTR101 SBOS146A − OCTOBER 1986 − REVISED AUGUST 2004 www.ti.com 6 THEORY OF OPERATION A simplified schematic of the XTR101 is shown in Figure 1. Basically, the amplifiers A1 and A2 act as a single power-supply instrumentation amplifier controlling a current source, A3 and Q1. Operation is determined by an internal feedback loop. e1 applied to pin 3 will also appear at pin 5, and similarly, e2 will appear at pin 6. Therefore, the current in RS (the span setting resistor) will be IS =(e2 −e1)/RS =eIN/RS. This current combines with the current I3 to form I1. The circuit is configured such that I2 is 19 times I1. From this point, the derivation of the transfer function is straightforward but lengthy. The result is shown in Figure 1. Examination of the transfer function shows that IO has a lower range-limit of 4mA when eIN = e2 − e1 = 0V. This 4mA is composed of 2mA quiescent current exiting pin 7 plus 2mA from the current sources. The upper range limit of IO is set to 20mA by the proper selection of RS based on the upper range limit of eIN. Specifically, RS is chosen for a 16mA output current span for the given full-scale input voltage span. For example, 0.016 amps volt ) 40 R S e IN full−scale + 16mA. Note that since IO is unipolar, e2 must be kept larger than e1 (that is, e2 ≥ e1 or eIN ≥ 0). Also note that in order not to exceed the output upper range limit of 20mA, eIN must be kept less than 1V when RS = ∞ and proportionately less as RS is reduced. +V CC A 1 +V CC D 1 V PS I O 7 e L 10 11 Q 1 R 1 Voltage−Controlled Current Source 2.5k Ω 100 µA 8 56 2mA R 2 52.6 Ω (e 2) I B1 I B2 I 2 I REF1 1k Ω e IN I S (e 2) (e 1) I 3 I 4 R 3 1.25k Ω − + I 1 + − A 2 A 3 (e 1) R S −In 3 +In 4 e IN I REF2 I O +V CC R 4 1.25k Ω +V CC +V CC R L I O + 4mA ) 0.016 amps volt ) 40 R S e IN, e IN + e 2 * e 1 Figure 1. Simplified Schematic of the XTR101 |
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