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AM417 Datasheet(PDF) 13 Page - Analog Devices |
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AM417 Datasheet(HTML) 13 Page - Analog Devices |
13 / 18 page AM417 – Ratiometric instrumentation amplifier with adjustable output stage Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz July 2008 –Rev 3.1- Page 13/18 Phone:+49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: info@analogmicro.de and from Equation 11 we are presented with: mV mV mV V V RO 5 . 6 6 2 67 . 6 10 5 . 0 2 − = − − ⋅ ⋅ = Referring to Equation 12a the resistance for offset calibration is thus: () Ω = ⋅ − ⋅ = 13 2 ' 0 0 IB R I V R If RO’ (resistor on the left) is set to 13Ω and if we take the offsets of sensing element and IC into consideration, the output signal offset of the overall circuit is set to VOUTmin = 0.5V and the maximum output signal is VOUTmax = 4.5V. TEMPERATURE COMPENSATION OF THE OUTPUT SPAN Supplying a piezoresistive sensing element with constant current makes compensation of the temperature of the span a relatively simple affair. With a constant current supply the negative temperature coefficient of sensor sensitivity S can be compensated by the positive temperature coefficient of bridge resistor RBR. 2 I IB R 1 4 5 R TSC 3 Input pin AM417 I IB ´ R BR Figure 4 : Bridge array for the compensation of TC with RBR = bridge resistor |
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