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AM417 Datasheet(PDF) 10 Page - Analog Devices |
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AM417 Datasheet(HTML) 10 Page - Analog Devices |
10 / 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 10/18 Phone:+49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: info@analogmicro.de EXAMPLES By way of example the equations shall be calculated using typical values for piezoresistive sensing elements [2] in an attempt to illustrate how various sensing elements can be calibrated and compensated with very few external components. The aim of the exercise is to calibrate the output voltage of AM417 to VOUTmin = 0.5V and VOUTmax = 4.5V Example 1: Piezoresistive pressure sensing element in a bridge circuit with a positive offset • VOUTME = 160mV at VBR = 5V • VCC = 5V • VOUT = 0.5...4.5V, => VSPAN = 4V, VOUTmin = 0.5V • VOSIC = -2mV • VOSME= +10mV at VBR = 5V • RBR = 3KΩ The sensing element is to be supplied with constant current as this provides a simple way of compensating the temperature behavior of the span (see: TEMPERATURE COMPENSATION OF THE OUTPUT SPAN). Taking the maximum output voltage at pin 2 ( IB) into account the supply current is selected as IIB = 1mA (R1 = 500Ω). At pin 2 ( IB) the voltage is: V V mA k V I R V VR BR BR IB 5 . 3 5 . 0 1 3 = + ⋅ Ω = + ⋅ = . Considering a typical positive temperature coefficient of the sensing element bridge resistor RBR of TCR = +0.0028/°C the maximum voltage at pin 2 (IB) is not overshot (VIBmax = 4.8V at VCC = 5V). The bridge voltage is: V k mA R I V BR BR BR 3 3 1 ' = Ω ⋅ = ⋅ = . The output voltage of the sensing element given for VBR = 5V must be corrected by the ratio of the bridge voltages: mV V V mV V OUTME 96 5 3 160 ' = ⋅ = The offset voltage of the sensing element given for VBR = 5V must be corrected by the ratio of the bridge voltages: mV V V mV V OSME 6 5 3 10 ' = ⋅ = Applying Equation 5 the following is accrued: 166 . 4 10 96 4 = ⋅ = mV V G OUT |
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