Analog Devices ADN2841 Application Note page 2

AN-631
When adjusting the extinction ratio, the user should allow
adequate time for the eye to settle.The allowable resistance
range at the power set input (PSET), the extinction ratio
set input (ERSET), and the alarm set (ASET) is between
1 k and 25 k. Resistors R31 through R33 ensure that the
Component
J3
J4
J5
J6
J7
T1
T3
T4
R19
R20
R21
K1
K2
K3
K4
Table I. Description of Board Settings
Name
POWER
CLKN
CLKP
DATAP
DATAN
IMPDMON
IBMON
IMMON
ASET Potentiometer
ERSET Potentiometer
PSET Potentiometer
K1
K2
K3
K4
resistance at these nodes never falls below the minimum
allowable value. If the node resistances increase above
25 k, the ADN2841 or ADN2847 may not operate within
its specifications.
Function
–5 V or –3.3 V Power Input to Board
CLKN Input
CLKP Input
DATAP Input
DATAN Input
IMPD Current Mirror Monitor
Bias Current Mirror Monitor
Modulation Current Mirror Monitor
Adjusts the BiasThreshold for Degrade and Fail Alarms
Adjusts the Extinction Ratio
Adjusts the MPD Current and thus the Average Power
Jumper to Bypass Supply Protection Diode
Jumper for LBWSET
Jumper to Exercise ALS
Jumper for CLKSEL
–2– REV. 0