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INA121 датащи(PDF) 12 Page - Texas Instruments

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номер детали INA121
подробное описание детали  FET-Input, Low Power INSTRUMENTATION AMPLIFIER
PDF  20 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

INA121 датащи(HTML) 12 Page - Texas Instruments

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12
®
INA121
INA121
R
G/2
R
G = 5.6kΩ
V
O
LA
RL
RA
10k
Ω
Ref
NOTE: Due to the INA121’s current-feedback
topology, V
G is approximately 0.7V less than
the common-mode input voltage. This DC offset
in this guard potential is satisfactory for many
guarding applications.
Low bias current
allows use with high
electrode impedances.
G = 10
2.8k
Ω
V
G
V
G
2.8k
Ω
1/2
OPA2131
390k
Ω
390k
Ω
1/2
OPA2131
FIGURE 12. Multiplexed-Input Data Acquisition System.
FIGURE 13. Shield Driver Circuit.
INA121
V
IN
–
V
IN
+
OPA130
511
Ω
22.1k
Ω
22.1k
Ω
Ref
V
O
For G = 100
R
G = 511Ω // 2(22.1kΩ)
effective R
G = 505Ω
100
Ω
NOTE: Driving the shield minimizes CMR degradation
due to unequally distributed capacitance on the input
line. The shield is driven at approximately 1V below
the common-mode input voltage.
FIGURE 14. ECG Amplifier With Right-Leg Drive.
INA121
V
IN
+
–
V
IN
+
–
Channel 8
Channel 1
MPC800
MUX
ADS7816
+5V
V
REF
+In
–In
12 Bits Out
Serial
R
G
Ref



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