Texas Instruments DAC7741EVM, User Manual

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9.3 Jumper Setting
1
3
1 3
1 3
1 3
1 3
1 3
1 3
1 3
1 3
1 3
1 3
EVM Operation
The figures in Table 6 shows the function of each jumper on the EVM.
Table 6. Jumper Setting Function
Reference Jumper Setting Function
R
OFFSET
is strapped to V
REF
to set V
(SJ)
(summing junction) to V
REF
/2. See the data sheet
for offset adjustment.
R
OFFSET
is not connected to set V
(SJ)
(summing junction) to V
REF
/3. See the data sheet for
W1
offset adjustment.
R
OFFSET
is strapped to AGND to set V
(SJ)
(summing junction) to V
REF
/6. See the data sheet
for offset adjustment.
Disables the internal reference voltage.
W2
Enables the internal reference voltage of 10 V.
REF
IN
is strapped to REF
OUT
to allow the internal 10 V to supply the DAC reference
voltage.
W3
REF
IN
is strapped to exREFin to allow either the onboard adjustable reference or
user-supplied reference to supply the DAC reference voltage.
Routes the onboard 10-V reference through the adjustable potentiometer to W3 and W14.
W4
Routes the user-supplied reference from TP1 or J4-20 through the adjustable poten-
tiometer to W3 and W14.
Negative supply rail of operational amplifier is powered by -15 V.
W5
Negative supply rail of operational amplifier is tied to AGND.
REFADJ pin is not connected.
W6
REFADJ pin is connected to R1 potentiometer for gain adjustment input when internal
reference is used.
RFB2 pin is not connected to the V
OUT
pin.
W7
RFB2 pin is strapped to the V
OUT
pin for feedback.
TEST pin not connected to DGND.
W8
TEST pin connected to DGND (default mode).
SJ (summing junction) pin of the DAC output amplifier is not connected.
W9
SJ (summing junction) pin of the DAC output amplifier is connected to R2 potentiometer to
allow small amount of current for offset adjustment.
RFB1 pin is not connected.
W10
RFB1 pin is strapped to RFB2 pin for DAC V
OUT
feedback.
Disconnects AGND from DGND.
W11
Connects AGND and DGND together.
DAC7741EVM 16 SLAU093A – October 2002 – Revised May 2005