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AD621 датащи(PDF) 17 Page - Analog Devices

номер детали AD621
подробное описание детали  Low Noise, Low Gain Drift, G = 2000 Instrumentation Amplifier
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD621 датащи(HTML) 17 Page - Analog Devices

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Data Sheet
AD8428
Rev. 0 | Page 17 of 20
Voltage Noise of the Instrumentation Amplifier
Total Noise Density Calculation
Unlike other instrumentation amplifiers in which an external
resistor is used to set the gain, the voltage noise specification
of the AD8428 already includes the input noise, output noise,
and the RG resistor noise.
To determine the total noise of the in-amp, referred to input,
combine the source resistance noise, voltage noise, and current
noise contribution by the sum of squares method.
For example, if the R1 source resistance in Figure 45 is 4 kΩ
and the R2 source resistance is 1 kΩ, the total noise, referred
to input, is
Current Noise of the Instrumentation Amplifier
The contribution of current noise to the input stage in nV/√Hz
is calculated by multiplying the source resistance in kΩ by the
specified current noise of the instrumentation amplifier in
pA/√Hz.
Hz
nV/
0
.
11
2
.
6
5
.
1
9
.
8
2
2
2
=
+
+
For example, if the R1 source resistance in Figure 45 is 4 kΩ
and the R2 source resistance is 1 kΩ, the total effect from the
current noise is calculated as follows:
() (
)
Hz
nV/
2
.
6
5
.
1
1
5
.
1
4
2
2
=
×
+
×



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