ADN2530

Rev. A | Page 17 of 20

IBIAS Monitor Accuracy Calculations

0

0

1

2

3

4

5

6

25

20

15

10

5

IBIAS (mA)

Figure 40. Accuracy of IBIAS to IBMON Ratio

This example assumes that the nominal value of IBIAS is 8 mA

and that the IBIAS range for all operating conditions is 4 mA to

14 mA. The accuracy of the IBIAS to IBMON ratio is given in

the Table 1 and is plotted in Figure 40.

Referring to Figure 40, the IBMON output current accuracy is

±4.3% for the minimum IBIAS of 4 mA and ±3.0% for the

maximum IBIAS value of 14 mA.

The accuracy of the IBMON output current as a percentage of

the nominal IBIAS is given by

%

15

.

2

mA

8

100

100

3

.

4

mA

4

_

±

=

×

=

MIN

Accuracy

IBMON

for the minimum IBIAS value, and by

%

25

.

5

mA

8

100

100

0

.

3

mA

14

_

±

=

×

=

MAX

Accuracy

IBMON

for the maximum IBIAS value. This gives a worse-case accuracy

for the IBMON output current of ±5.25% of the nominal IBIAS

value over all operating conditions. The IBMON output current

accuracy numbers can be combined with the accuracy numbers

sources to calculate an overall accuracy for the IBMON voltage.