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INA159 Datasheet(PDF) 30 Page - Texas Instruments

Part # INA159
Description  INA826 Precision, 200-μA Supply Current, 3-V to 36-V Supply Instrumentation Amplifier With Rail-to-Rail Output
PDF  51 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

INA159 Datasheet(HTML) 30 Page - Texas Instruments

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+Vs
+Vs
-Vs
-Vs
V1 5
Iload 10
Rshunt 3.5m
Vbus 10
Rout 10k
Vout
RG 499
+
+
-
Rg
Rg
Ref
U2 INA826
V2 5
Copyright © 2017, Texas Instruments Incorporated
Vref
+Vs
+Vs
Vref
+Vs
Vref
+Vs
+Vs
RG1 6.1k
RG2 6.1k
R3 10k
R7 52k
C4 47n
R4 52k
C2 47n
Rprot1 100k
C5 33p
Rprot2 100k
C7 33p
R12 500k
C10 1u
+
-
+
U1 OPA333
Rprot3 100k
R5 10M
R6 10k
C11 1n
ECG_RA
ECG_LA
Vout
C6 1n
R1 1M
R9 1M
V1 5
-
+
+
U2 OPA2314
-
+
+
U3 OPA2314
ECGp
ECGn
+
+
-
Rg
Rg
Ref
U4 INA826
RA Electrode
LA Electrode
RL Electrode
Copyright © 2016, Texas Instruments Incorporated
30
INA826
SBOS562G – AUGUST 2011 – REVISED JUNE 2020
www.ti.com
Product Folder Links: INA826
Submit Documentation Feedback
Copyright © 2011–2020, Texas Instruments Incorporated
System Examples (continued)
Figure 69. ECG Circuit
Figure 70 shows an example of how the INA826 can be used for low-side current sensing. The load current
(ILOAD) creates a voltage drop across the shunt resistor (RSHUNT). This voltage is amplified by the INA826 with
gain set to 100. The output swing of the INA826 is set by the common-mode voltage (which is 0 V in low-side
current sensing) and power supplies. Therefore, a dual-supply circuit is implemented. The load current is set
from 1 A to 10 A, corresponding to an output voltage range from 350 mV to 3.5 V. The output range can be
adjusted by changing the shunt resistor and the gain of the INA826. Click the following link to download the
TINA-TI file: Current Sensing Circuit.
Figure 70. Low-Side Current Sensing



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