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AM457 Datasheet(PDF) 8 Page - Analog Microelectronics |
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AM457 Datasheet(HTML) 8 Page - Analog Microelectronics |
8 / 10 page Precision amplifier for bridge circuits AM457 analog microelectronics May 2005 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 8/10 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 2.2 Internet: www.analogmicro.de Email: info@analogmicro.de The formulae used are: RS B 2 1 d 5 R 2 R R ⋅ ⋅ = = (kΩ) Span adjustment (1) 100 R R 1 4 = (kΩ) Auxiliary resistor (2) RS RO 4 RS RO 3 d 9 d 8 R ) d d 8 ( R ⋅ + ⋅ ⋅ + ⋅ − = (kΩ) Offset adjustment (3) whereby the following applies to the individual sensing elements: RB – Bridge resistance in ohms dRS – Span/supply voltage in mV/V dRO – Offset/supply voltage in mV/V In order to calculate the discrete adjusting resistors R1, R2, R3 and R4 the offset, span and bridge resistance of the sensing element to be calibrated are first determined. The sensing element is then connected up to an AM457 to form the circuit illustrated in Figure 2. The resistors are dimensioned and applied according to the given formulae. The values of the capacitors are selected according to Table 1. (Capacitors C3…C6 are designated as decoupling capacitors; their use is therefore optional.) Using the calculated resistances and the given capacitors the offset and span (0.5...4.5V) should now be set. Discrepancies between the resistors used and the theoretical value enter the offset error proportionally. The calibration suggested in this article is suitable and has a sufficient accuracy for all sensing elements • which consist of four bridge resistors • which permit calibration with discrete resistors • which have a sensitivity of ±5…±100mV FS • where the span signal is greater than the offset. Depending on the level of accuracy required, when using sensing elements which have additional resistors (such as ceramic sensing elements for offset correction, for example) the discrete adjusting resistors must be corrected due to the discrepancy between the model and the sensing element (see [2]). |
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