ADN2531ACPZ-R2 datasheet(17/20 Pages) AD

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ADN2531

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e actual resistance of the TOSA

The value of K depends on th

This example assumes that the nominal value of IBIAS is 40 mA

and can be obtained from Figure 35. For a TOSA resistance of

12 Ω, the typical value of K is 110 mA/V. Assuming that IMOD =

40 mA and using the preceding equation, the MSET voltage is

given by

and that the IBIAS range for all operating conditions is 10 mA to

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

and is plotted in Fig

e 1

t c

t accuracy is

mum IBIAS of 10 mA and ±3.0% for the

max

entage of

BIAS

is given by

ure 4 .

41, t e IBMON outpu urren

Referring to Figur

±4.3% for the mini

110

mA/V

110

(mA)

= MOD

MSET

The MSET voltage range can be calculated using the required

IMOD range and the minim

imum IBIAS value of 80 mA.

The accuracy of the IBMON output current as a perc

the nominal I

um and maximum K values. These

values can be obtained from the minimum and maximum

curves in Figure 35.

IBIAS Monitor Accuracy Calculations

075

100

MIN

Accuracy

IBMON

for the minimum IBIAS value, and by

100

MAX

Accuracy

IBMON

100

IBIAS (mA)

Figure 41. Accuracy of IBIAS to IBMON Ratio

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

for the IBMON output current of ±6.0% of the nominal IBIAS

value over all operating conditions. The IBMON output curr

accuracy numbers can b

ent

e combined with the accuracy numbers

for t

nd any other error

voltage.

he 750 Ω IBMON resistor (RIBMON) a

sources to cal ulate an overall accuracy for the IBMON

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