ADuC7024 Evaluation Board Reference Guide
(3)
Link Options
Rev. 1.0
Analog Devices Inc., MicroConverter
Page 6 of 15
www.analog.com/microconverter
(3)
DIP
S
WITCH
L
INK
O
PTIONS
S1-1 VREF
Function:
Connects the output of the 2.5V external reference (ADR291) to the VREF pin (pin #55) of
the ADuC7024.
Use:
Slide S1-1 to the ON position
to connect the external reference to the ADuC7024.
Slide S1-1 to the OFF position
to use the internal 2.5V reference or a different external
reference on VREF pin of J3 header.
S1-2 V
OCM
Function:
Connects 1.67V to the V
OCM
pin of the AD8132. No extra 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
OCM
of the differential amplifier to 1.67V, divided
output of the ADR291 reference.
Slide S1-2 to the OFF position
to use a different voltage for V
OCM
by connecting a DC
voltage to the V
OCM
pin of J3 header. Note that V
OCM
value is dependant on reference value as
shown in Table 1:
V
REF
V
OCM
min V
OCM
max
2.5V 1.25V 2.05V
2.048V 1.024V 2.276V
1.25V 0.75V 2.55V
Table 1: V
OCM
range
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 ADC0 input
channel.
Slide S1-3 to the OFF position
to use ADC0 input on J3 header.
S1-4 ADC3
Function:
Brings out ADC3 (pin #64) on J3 header.
Use:
Slide S1-6 to the ON Position
to connect directly ADC3 of J3 header to ADC3 pin (pin #64)
of the ADuC7024.
Slide S1-6 to the OFF Position
to disconnect ADC3 of J3 header from ADC3 pin (pin #64)
of the ADuC7024.
