ADN2530 Analog Devices, Inc., ADN2530 Datasheet - Page 17

• Manufacturer Part Number: ADN2530
• Description: 11.3 Gbps, Active Back-termination, Differential Vcsel Driver
• Manufacturer: Analog Devices, Inc.

IBIAS Monitor Accuracy Calculations
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.
6
5
4
3
2
1
0
0
Figure 40. Accuracy of IBIAS to IBMON Ratio
5
10
IBIAS (mA)
15
20
25
Rev. A | Page 17 of 20
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
for the minimum IBIAS value, and by
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
for the 750 Ω IBMON resistor (R
sources to calculate an overall accuracy for the IBMON voltage.
IBMON
IBMON
_
_
Accuracy
Accuracy
MIN
MAX
=
=
4
14
mA
IBMON
mA
100
4
) and any other error
100
3 .
3
0 .
×
×
8
100
8
mA
100
mA
ADN2530
=
=
±
±
. 2
. 5
15
25
%
%