Datasheet

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3.1 Factory Default Setting
A
1 3
1 3
Jumperindicatespins
1 & 2 areshorted
Jumperindicatespins
2 & 3 areshorted
Jumpershorted
Jumperopen
3.2 Host Processor Interface
EVM Operation
The EVM board is set to its default configuration from the factory as described in the Table 2 to operate in
bipolar ± 10-V mode of operation. Figure 8 shows the default jumper configuration as described in the table
for the DAC8871.
Table 2. Factory Default Jumper Setting
Reference Jumper Function
Position
W1 1-2 The onboard reference of –10 V is routed to V
REF
L of the DAC8871.
W2 1-2 RSTSEL is pulled high to V
DD
and sets the default output pf the DAC8871 on power up to midscale
(0x8000).
W3 1-2 The onboard reference of +10 V is routed to V
REF
H of the DAC8871.
W4 1-2 RST is pulled high to V
DD
.
W5 1-2 FS signal from J2-7 is used to control the CS pin of the DAC8871 for DAC access and frame
synchronization.
W6 1-2 GPIO signal from J2-17 is used to control the LDAC pin of the DAC8871 to allow the DAC output
latch to be updated.
W7 CLOSE Allows the onboard REF102 output of +10 V to propagate through for the DAC8871’s voltage
reference high and low source (V
REF
H, V
REF
L).
W8 OPEN Not used.
W9 1-2 The digital logic interface of the DAC8871 is powered with +3.3 VD.
Figure 8. DAC8871 EVM Default Jumper Configuration
The host processor basically drives the DAC; therefore, the DAC's proper operation depends on the
successful configuration between the host processor and the EVM board. In addition, a properly written
code is also required to operate the DAC.
A custom cable can be made specific to the host interface platform that the user selects. The EVM allows
interface to the host processor through the J2 header connector for the serial control signals and the serial
data input.
An interface adapter board is also available for a specific TI DSP starter kit as well as an MSP430-based
microprocessor as previously mentioned in this manual. Using the interface board eliminates the task of
building customize cables and allows easy configuration of a simple evaluation system.
The DAC8871 interfaces with any host processor capable of handling SPI™ protocols or the TI DSP. For
more information regarding the DAC8871 data interface, see the DAC8871 data sheet (SBAS396 ).
DAC8871 Evaluation Module10 SLAU233 – September 2007
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