1
3
1
3
1
3
1
3
1
3
1
3
1
3
1
3
1
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1
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1
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1
3
1
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1
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1
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1
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1
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1
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EVM Operation
Table 7. Jumper Setting Functions (continued)
Jumper
Reference
Function
Setting
Connects V
REF
H to the inverting input of U2 for the DAC8881 bipolar mode of operation.
W3
Disconnects V
REF
H from the inverting input of U2 to allow another output mode of configuration.
Routes the reference voltage from J4 pin 18 for the V
REF
L pin of the DAC8881
W4
Connects the V
REF
L pin of the DAC8881 to ground.
Negative supply rail of the output op-amp, U2, is powered by V
SS
for bipolar operation.
W5
Negative supply rail of the output op-amp, U2, is tied to AGND for unipolar operation.
CS signal from J2-1 is routed to drive the CS signal of the DAC8881.
W6
FS signal from J2-7 is routed to drive the CS signal of the DAC8881.
Routes the reference feedback, R
FB
, pin of the DAC8881 to J4 pin 4 to provide the option to
close the output op-amp, U2, loop as close as possible to the load.
W7
Leave this jumper open if R1 is installed. This is the default mode of the EVM from the factory.
Routes the reference feedback, R
FB
, pin of the DAC8881 to J4 pin 8 to provide the option to
close the output op-amp, U2, loop as close as possible to the load.
Routes the on-board +5V voltage reference, V
REF
H, for the DAC.
Disconnects the on-board or external positive voltage reference, V
REF
H, for the DAC via U5A or
W8
J1 pin 20. Allows user reference voltage to connect via TP1.
Routes the external positive voltage reference, V
REF
H, for the DAC via J1 pin 20.
Routes V
OUT
and R
FB
from J4-2 and J4-4 to the non-inverting input of the U2 op-amp.
W9
Routes V
OUT
and R
FB
from J4-6 and J4-8 to the non-inverting input of the U2 op-amp.
LDAC1 signal from J2-15 is routed to drive the LDAC signal of the DAC8881.
The LDAC signal of the DAC8881 is tied to ground for synchronous update of the DAC8881
W10
output.
LDAC2 signal from J2-17 is routed to drive the LDAC signal of the DAC8881.
Routes V
CC
to power the analog supply of the U3 reference device.
W11
5VA to power the analog supply of the U3 reference device.
15
SLAU257A – September 2008 – Revised November 2009
DAC8881 Evaluation Module
Copyright © 2008–2009, Texas Instruments Incorporated