Evaluation Board User Guide
UG-442
Rev. C | Page 5 of 16
Link No.
Description
LK15
This link selects the voltage reference source.
Position A selects the internal voltage reference of the
AD5422
as the voltage reference source.
Position B selects an external source that can be applied at Connector J3.
Position C selects the on-board
ADR435
as the voltage reference source.
LK16
This link selects the negative power supply source for U6.
Position A selects the AV
SS
input as the negative power supply source (use only if the power supply applied to AV
SS
input is
less (in magnitude) than −16.5 V).
Position B selects the V− input as the negative power supply source (use only if the power supply applied to AV
SS
input is
greater (in magnitude) than −16.5 V).
LK17
This link connects the DV
CC
pin of the
AD5422
to the on-board digital power supply.
When this link is inserted, the DV
CC
pin of the
AD5422
is connected to the on-board digital power supply (LK3 must be
inserted to disable the
AD5422
internal digital power supply).
When this link is removed, the DV
CC
pin of the
AD5422
is disconnected from the on-board digital power supply (LK3 should
be removed to enable the
AD5420
internal digital power supply).
LK18
This link connects the AV
DD
pin of the
AD5422
to the power supply applied at the AV
DD
input connector, J2 (LK18 must be
inserted for operation of the
AD5422
).
