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AM417 Datasheet(PDF) 10 Page - Analog Devices

Part # AM417
Description  Ratiometric instrumentation amplifier with adjustable output stage
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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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
=
+
=
+
=
.
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
'
=
=
=
.
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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