Dip Switch Link Options; S1-1 Vref; S1-2 Vocm; S1-3 Pot - Analog Devices EVAL-ADuC7026 User Manual

EVAL-ADuC7026 User Guide

DIP SWITCH LINK OPTIONS

S1-1 V
REF
Function
Connects the output of the 2.5 V external reference (ADR291)
to the V pin (Pin 68) of the ADuC7026.
REF
Use
Slide S1-1 to the on position to connect the external reference
to the ADuC7026.
Slide S1-1 to the off position to use the internal 2.5 V reference
or a different external reference on the V
S1-2 V
OCM
Function
Connects 1.67 V to the V
OCM
dc voltage is required on the board to use the ADC in
differential mode.
Use
Slide S1-2 to the on position to connect V
amplifier to the 1.67 V divided output of the
Slide S1-2 to the off position to use a different voltage for V
by connecting a dc voltage to the V
that the V value is dependent on the reference value, as
OCM
shown in Table 1.
Table 1. V Range
OCM
V V Minimum
REF OCM
2.5 V 1.25 V
2.048 V 1.024 V
1.25 V 0.75 V

S1-3 POT

Function
Connects the potentiometer output to ADC0. This input is
buffered by an AD8606. This is for demonstration purposes.
Use
Slide S1-3 to the on position to connect the potentiometer to
the op amp of the ADC0 input channel.
Slide S1-3 to the off position to use the ADC0 input on Header J3.

S1-4 ADC3

Function
Brings out ADC3 (Pin 80) on Header J3.
Use
Slide S1-4 to the on position to connect ADC3 of Header J3
directly to the ADC3 pin (Pin 80) of the ADuC7026.
Slide S1-4 to the off position to disconnect ADC3 of Header J3
from the ADC3 pin (Pin 80) of the ADuC7026.
pin of Header J3.
REF
pin of the AD8132. No extra
of the differential
OCM
ADR291 reference.
pin of Header J3. Note
OCM
V Maximum
OCM
2.05 V
2.276 V
2.55 V

S1-5 VIN−

Function
Connects the −OUT pin of the single-ended to differential op
amp (AD8132) to ADC3. S1-5 and S1-6 must be used together.
When VIN− is in the on position, VIN+ must also be in the on
position to use the differential op amp on Channel ADC3 and
Channel ADC4.
Use
Slide S1-5 to the on position to connect −OUT of the
to ADC3.
Slide S1-5 to the off position to use ADC3 without the AD8132.

S1-6 VIN+

Function
Connects the +OUT pin of the single-ended to differential op
amp (AD8132) to ADC4. When VIN+ is in the on position,
VIN− must also be in the on position to use the differential op
amp on Channel ADC3 and Channel ADC4.
Use
OCM
Slide S1-6 to the on position to connect +OUT of the
to ADC4.
Slide S1-6 to the off position to use ADC4 without the AD8132.

S1-7 ADC4

Use
Slide S1-7 to the on position to connect ADC4 of Header J3
directly to the ADC4 pin (Pin 1) of the ADuC7026.
Slide S1-7 to the off position to disconnect ADC4 of Header J3
from the ADC4 pin (Pin 1) of the ADuC7026.

S1-8 LED

Function
Connects the DAC1 output to the green LED of the
demonstration circuit, D1.
Use
Slide S1-8 to the on position to connect the DAC1 output to D1.
Slide S1-8 to the off position to use the DAC1 output on
Header J3.
Rev. B | Page 5 of 16
UG-669
AD8132
AD8132