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EVM Operation
Table 7. Jumper Settings and Functions (continued)
Reference
Jumper Setting
(1)
Function
A0 pin is set high through pull-up resistor R4. A0 can be driven by GPIO5,
J2-19.
JMP4
A0 pin is set low.
Disconnects V
REF
H to the inverting input of the op amp U2.
JMP5
Connects V
REF
H to the inverting input of the op amp U2.
Disconnects the inverting input of the op amp U2 from the gain resistor,
R9.
JMP6
Connects the inverting input of the op amp U2 from the gain resistor, R9
for output gain of 2.
+5V analog supply is selected for AV
DD
.
JMP7
+3.3V analog supply is selected for AV
DD
.
Routes the adjustable, buffered, o5V reference to the V
REF
H
input of the DAC8554.
JMP8
Routes the user-supplied reference from TP2 or J4-20 to the V
REF
H input
of the DAC8554.
V
REF
L is tied to AGND.
JMP9
Routes the user-supplied negative reference from TP3 or J4-18 to the
V
REF
L input of the DAC8554. This voltage should be within the range of
0V to V
REF
H.
Negative supply rail of the op amp U2 is powered by V
SS
for bipolar
operation.
JMP10
Negative supply rail of the op amp U2 is tied to AGND for unipolar
operation.
Routes V
OUT
A to J4-2.
JMP11
Routes V
OUT
A to J4-10.
DAC8554EVM User's Guide
18
SBAU121 – January 2006