DIO2216

Version 1.3, Apr 2026

www.dioo.com

© 2026 Dioo Microcircuits Co., Ltd. Jiangsu.

10

(max). To create a 20 mV drop with a 10 A load current, the shunt resistor is 2 mΩ.

It’s highly recommended to consider that at higher currents, the power dissipation in the shunt resistor

becomes greater when choose the shunt resistor. So, it’s important to assess the drift of the sense resistor

as a result of power dissipation and choose a suitable resistor depending on its power wattage rating.

8.4. Calculating total error

The typical individual errors are mentioned in the EC table, such as gain error, offset error and nonlinearity

error. However, total error, which includes all of the individual error components, is not shown in the EC

table. To calculate the error accurately, the operating conditions of the device should be considered firstly.

For some current shunt monitors, a total error in shown in the product data sheet. However, specifying such

total error has little practical value because this total error term is accurate under only one particular set of

operating conditions. It means that any deviation from these specific operating conditions will change the

total error value. For the device under normal operating conditions, this section will discuss the individual

error sources and how to apply them to calculate the total error value.

The typical error sources that have the largest impact on the total error of the device are input offset voltage,

common-mode voltage rejection, gain error, and nonlinearity error.

Compared to the gain error specification, the nonlinearity error is relatively low. It leads to a gain error that

can be expected to be relatively constant throughout the linear input range of the device. Although gain

error keeps constant across the linear input range of the device, the error associated with the input offset

voltage is subject to change. As the differential input voltage across the shunt resistor at the DIO2216's

input decreases, the inherent input offset voltage constitutes a larger proportion of the measured input

signal, thereby increasing the measurement error. This type of error, which is common to all current shunt

monitors, is influenced by the ratio of the input offset voltage to the sensed voltage. Despite this, the

DIO2216's low input offset voltages reduce the impact of the offset on the total error.

Here are the equations to calculate the error terms.

Table 1. Equations of error terms

Term

Label

Equation

Maximum initial input offset voltage

VIO

/

Added input offset voltage as result of

common-mode voltage

VIO_CM

|

V

-

4.2V

|

×

)

20

CMRR_dB

10(

1

CM

Total input offset voltage

VIO_Total

2

2

(VIO_CM)

+

(VIO)

Error because of input offset voltage

Error_VIO

100

×

V

VIO_Total

SENSE

Gain error

Error_Gain

/

Nonlinearity error

Error_Lin

/

Total error

2

2

2

)

(Error_Lin

+

n)

(Error_Gai

)

(Error_VIO

+