Datasheet

Æ1 Æ2 Æ2 Æ1
Æ2Æ2
Æ1 Æ1
V
IN+
V
IN-
V
REF
GND
V
+
Æ1 Æ2 Æ2 Æ1
Æ2Æ2
V
IN+
V
IN-
GND
V
+
Æ1 Æ2 Æ2 Æ1
Æ2Æ2
V
IN+
V
IN-
GND
V
+
Output
Output Output
Summed
Output
FirstCircuit SecondCircuit ThirdCircuit
Æ1
Æ1
(Error_V ) +(Error_Gain) +(Error_Lin)
OS
2 2 2
V
V
OS_Total
SENSE
´ 100
(V ) +(V ) +(V )
OS OS_CM OS_REF
2 2 2
R (2.048V V )-
CMR REF
´
´ (V 12V)-
CM
1
CMRR_dB
20
(
(
10
INA282, INA283
INA284, INA285
INA286
SBOS485B –NOVEMBER 2009–REVISED SEPTEMBER 2012 www.ti.com
Example 2
INA286; V
S
= 5V; V
CM
= 24V; V
REF
= 0V; V
SENSE
= 10mV
Table 2. Example 2
TERM SYMBOL EQUATION TYPICAL VALUE MAXIMUM VALUE
Initial Input Offset
V
OS
— 20μV 70μV
Voltage
Added Input Offset
Voltage Because of
V
OS_CM
1.2μV 12μV
Common-Mode
Voltage
Added Input Offset
Voltage Because of V
OS_REF
34.8μV 92.2μV
Reference Voltage
Total Input Offset
V
OS_Total
40.2μV 116.4μV
Voltage
Error from Input
Error_V
OS
0.40% 1.16%
Offset Voltage
Gain Error Error_Gain — 0.40% 1.40%
Nonlinearity Error Error_Lin — 0.01% 0.01%
Total Error — 0.57% 1.82%
SUMMING CURRENTS AND PARALLELING
The outputs of multiple INA282 family devices are easily summed by connecting the output of one INA282 family
device to the reference input of a second INA282 family device. Summing beyond two devices is possible by
repeating this connection, and is shown for three devices in Figure 40. The reference input of the first INA282
family device sets the output quiescent level for all the devices in the string.
NOTE: The voltage applied to the reference inputs cannot exceed 9V.
Figure 40. Summing the Outputs of Multiple INA282 Family Devices
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Product Folder Links: INA282 INA283 INA284 INA285 INA286