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AD8226ARZ-R7 Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte AD8226ARZ-R7
Spiegazioni elettronici  Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

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Preliminary Technical Data
AD8226
Rev. PrA | Page 11 of 16
AD8226
+VS
+IN
–IN
LOAD
REF
0.1µF
10µF
0.1µF
10µF
–VS
VOUT
Figure 6. Supply Decoupling, REF, and Output Referred to Local Ground
References
The output voltage of the AD8226 is developed with respect to
the potential on the reference terminal. Care should be taken to
tie REF to the appropriate local ground.
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8226 must have a return path
to ground. When the source, such as a thermocouple, cannot
provide a return current path, one should be created, as shown
in Figure 7.
THERMOCOUPLE
+VS
REF
–VS
AD8226
CAPACITIVELY COUPLED
+VS
REF
C
C
–VS
AD8226
TRANSFORMER
+VS
REF
–VS
AD8226
INCORRECT
CAPACITIVELY COUPLED
+VS
REF
C
R
R
C
–VS
AD8226
1
fHIGH-PASS = 2πRC
THERMOCOUPLE
+VS
REF
–VS
10MΩ
AD8226
TRANSFORMER
+VS
REF
–VS
AD8226
CORRECT
Figure 7. Creating an IBIAS Path
RADIO FREQUENCY INTERFERENCE (RFI)
RF rectification is often a problem when amplifiers are used in
applications having strong RF signals. The disturbance can appear
as a small dc offset voltage. High frequency signals can be filtered
with a low-pass RC network placed at the input of the instru-
mentation amplifier, as shown in Figure 8. The filter limits the
input signal bandwidth, according to the following relationship:
FilterFrequencyDIFF =
)
2
(
π
2
1
C
D
C
C
R
+
FilterFrequencyCM =
C
RC
π
2
1
where CD ≥ 10 CC.
R
R
AD8226
+VS
+IN
–IN
0.1µF
10µF
10µF
0.1µF
REF
VOUT
–VS
RG
CD
10nF
CC
1nF
CC
1nF
4.02kΩ
4.02kΩ
Figure 8. RFI Suppression
CD affects the difference signal, and CC affects the common-mode
signal. Values of R and CC should be chosen to minimize RFI.
Mismatch between the R × CC at the positive input and the R × CC
at the negative input degrades the CMRR of the AD8226. By using
a value of CD one magnitude larger than CC, the effect of the
mismatch is reduced, and performance is improved.


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