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ADN2531ACPZ-WP Datasheet(PDF) 17 Page - Analog Devices

Part No. ADN2531ACPZ-WP
Description  11.3 Gbps, Active Back-Termination, Differential Laser Diode Driver
Download  20 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADN2531ACPZ-WP Datasheet(HTML) 17 Page - Analog Devices

 
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ADN2531
Rev. 0 | Page 17 of 20
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
1
e 1
e
h
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
V
36
.
0
110
40
mA/V
110
(mA)
=
=
= MOD
MSET
I
V
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
4
5
6
%
075
.
1
mA
40
100
100
3
.
4
mA
10
_
±
=
×
=
MIN
Accuracy
IBMON
for the minimum IBIAS value, and by
0
0
20
%
0
.
6
mA
40
100
100
0
.
3
mA
80
_
±
=
×
=
MAX
Accuracy
IBMON
1
2
3
100
80
60
40
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
c
voltage.
he 750 Ω IBMON resistor (RIBMON) a
sources to cal ulate an overall accuracy for the IBMON


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