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EVM Operation
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5.5 Jumper Setting
Table 7 shows the function of each specific jumper setting of the EVM.
Table 7. Jumper Setting Function
Reference Jumper Setting Function
Routes +5VA for AV
DD
and DV
DD
to power the analog and digital supplies of the DAC9881.
W1
Routes +3.3VA for AV
DD
and DV
DD
to power the analog and digital supplies of the DAC9881.
Routes V
OUT
to J4-2.
W2
Routes V
OUT
to J4-6.
Connect V
REF
H to the inverting input of U2 for DAC9881’s bipolar mode of operation.
W3
Disconnects V
REF
H from the inverting input of U2 to allow other output mode of configuration.
Routes the reference voltage from J4 pin 18 for the V
REF
L pin of the DAC9881.
W4
Connects the V
REF
L pin of the DAC9881 to ground.
Negative supply rail of the output operational amplifier, U2, is powered by V
SS
for bipolar
operation.
W5
Negative supply rail of the output operational amplifier, U2, is tied to AGND for unipolar
operation.
CS signal from J2-1 is routed to drive the CS signal of the DAC9881.
W6
FS signal from J2-7 is routed to drive the CS signal of the DAC9881.
Routes the reference feedback, R
FB
, pin of the DAC9881 to J4 pin 4 to provide the option to
close the output operational amplifier, U2, loop as close as possible to the load.
Leave this jumper open if R1 is installed. This is the default mode of the EVM when it comes out
W7
of the factory.
Routes the reference feedback, R
FB
, pin of the DAC9881 to J4 pin 8 to provide the option to
close the output operational amplifier, U2, loop as close as possible to the load.
Routes the onboard +5-V voltage reference, V
REF
H for the DAC.
Disconnect onboard or external positive voltage reference, V
REF
H for the DAC via U5A or J1 pin
W8
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.
14
DAC9881 Evaluation Module SLAU279A–March 2009–Revised November 2009
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