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AD8226CRMZ-R7 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD8226CRMZ-R7
Descrição Electrónicos  Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD8226CRMZ-R7 Folha de dados(HTML) 9 Page - Analog Devices

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Preliminary Technical Data
AD8226
Rev. PrA | Page 9 of 16
THEORY OF OPERATION
A3
R2
2.47kΩ
R1
2.47kΩ
A1
A2
+VS
–VS
Q2
Q1
–IN
+IN
+VS
–VS
+VS
–VS
R3
50kΩ
R4
50kΩ
R5
50kΩ
RB
RB
+VS
–VS
OUT
REF
NODE 1
NODE 2
RG
UB
+VS
–VS
+VS
–VS
NODE 4
NODE 3
R6
50kΩ
DIFFERENCE
AMPLIFIER STAGE
GAIN STAGE
Figure 3. Simplified Schematic
ARCHITECTURE
The AD8226 is based on the classic three op amp topology. This
topology has two stages: a preamplifier to provide differential
amplification, followed by a difference amplifier to remove the
common-mode voltage. Figure 3 shows a simplified schematic of
the AD8226.
The first stage works as follows: in order to maintain a constant
voltage across the Bias Resistor RB, Amplifier A1 must keep
Node 3 a constant diode drop above the positive input voltage.
Similarly, Amplifier A2 keeps Node 4 at a constant diode drop
above the negative input voltage. Therefore a replica of the
differential input voltage is placed across the gain setting
resistor, RG. The current that flows across this resistance must
also flow through the R1 and R2 resistors, creating a gained
differential signal between the A2 and A1 outputs. Note that, in
addition to a gained differential signal, the original common-
mode signal, shifted a diode drop down, is also still present.
The second stage is a difference amplifier, composed of A3 and
four 50 kΩ resistors. The purpose of this stage is to remove the
common-mode signal from the amplified differential signal.
Because the input amplifiers employ a current feedback
architecture, the gain-bandwidth product of the AD8226
increases with gain, resulting in a system that does not suffer
from the expected bandwidth loss of voltage feedback
architectures at higher gains.
The transfer function of the AD8226 is
VOUT = G(VIN+ − VIN−) + VREF
where
G
R
G
49.4
1 +
=
GAIN SELECTION
Placing a resistor across the RG terminals sets the gain of the
AD8226, which can be calculated by referring to Table 7 or by
using the following gain equation:
1
49.4
=
G
RG
Table 7. Gains Achieved Using 1% Resistors
1% Standard Table Value of R
G (Ω)
Calculated Gain
49.9 k
1.990
12.4 k
4.984
5.49 k
9.998
2.61 k
19.93
1.00 k
50.40
499
100.0
249
199.4
100
495.0
49.9
991.0
The AD8226 defaults to G = 1 when no gain resistor is used.
The tolerance and gain drift of the RG resistor should be added
to the AD8226’s specifications to determine the total gain
accuracy of the system. When the gain resistor is not used,
gain error and gain drift are minimal.
INPUT PROTECTION
The input terminals of the AD8226 have input protection that
allows the input voltage to go beyond the rails without
damaging the part. Maximum voltage is –Vs+40 V and
minimum voltage is +Vs-40 V. For example: with ±15 V
supplies, the part can withstand input voltages of ±25 V; with a
5 V single supply, maximum input voltage is 40 V and
minimum input voltage is 35 V.


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