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AM417 Datasheet(PDF) 8 Page - Analog Devices

Part # AM417
Description  Ratiometric instrumentation amplifier with adjustable output stage
PDF  18 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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AM417 Datasheet(HTML) 8 Page - Analog Devices

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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 8/18
Phone:+49 (0)6131/91 073-0
Fax: +49 (0)6131/91 073-30
Internet: http://www.analogmicro.de
Email: info@analogmicro.de
resistor RO is inserted into the measuring bridge (see Figure 2). By using this compensating resistor
the instrumentation amplifier input voltage
∆VIN is set in such a way, that output voltage VOUTmin has
a value of 0.5V, for example. The voltage drop
VRO across resistor RO is given by:


+
−


+
−
+
−
∆
=
4
3
3
2
1
2
4
3
4
1
/
B
B
B
B
B
B
B
B
B
BR
IN
RO
R
R
R
R
R
R
R
R
R
V
V
V
(6)
where VBR is the voltage drop across the entire sensing element, RBR the total bridge resistance and
RB1,2,3,4 the individual bridge resistors. Assuming that the four separate bridge resistors have the
same value, the following approximation formula is valid:
VRO = 2∆VIN
(7)
∆VIN is the voltage to be set at the input of the instrumentation amplifier where there are no offsets.
OUT
IA
OUT
SYS
OUT
IN
G
G
V
G
V
V
⋅
=
=
∆
min
min
(8)
Taking the offset of the sensing element (VOSME) and that of the IC (VOSIC) into account
(VOSIC = VOSIA + 0.1VOSOUT, where VOSIA is the instrumentation amplifier offset and VOSOUT the
output stage offset), the adjustable voltage is calculated as:
∆VIN’ = ∆VIN - VOSIC - VOSME
(9)
From (9) and (8) it follows that:
OSME
OSIC
OUT
IA
OUT
IN
V
V
G
G
V
V
−
−
⋅
=
∆
min
´
(10)
Applying (7) and (10), the necessary voltage drop across RO required to calibrate the offset of the
output voltage VOUTmin is expressed thus:


−
−
⋅
⋅
=
OSME
OSIC
OUT
IA
OUT
RO
V
V
G
G
V
V
min
2
(11)
On condition, the sensing element offset is low referenced to the sensing element output voltage
(VOSME < 10 VOUTME), the resistor RO is calculated with sufficient accuracy as:
IB
RO
O
I
V
R
⋅
=
2
(12)
Applying (11) and the condition, that the voltage drop across Ro may only be positive, the
maximum compensatable offset is computed thus:
OUT
IA
OUT
OSME
OSIC
G
G
V
V
V
⋅
≤
+
min
(13)



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