Factory Default Setting
3-2
3.1
Factory Default Setting
The EVM board is set to to operate in bipolar,
±
10 V mode of operation, in its
default configuration from the factory as described in Table 3 - 1 .
Table 3 - 1. Factory Default Jumper Setting
Reference
Jumper
Position
Function
W1
1 - 2
Analog supply for the DAC8534 is +5 V, (labeled as +5 VA).
W2
1 - 2
DAC output A (V
OUT
A) is routed to J4 - 2.
W3
OPEN
V
REF
H is not routed to the inverting input of the op amp for voltage offset with gain
of 2 output.
W4
1 - 2
Onboard external buffered reference U3 is routed to V
REF
H.
W5
1 - 2
Negative supply rail of U2 Op Amp is supplied with V
SS
.
W6
1 - 2
V
REF
L is tied to AGND.
W7
CLOSED
A0 pin is tied to DGND.
W8
CLOSED
A1 pin is tied to DGND.
W9
CLOSED
LDAC pin is tied to DGND. Software LDAC is used.
W10
CLOSED
EN pin is tied to DGND.
W11
1 - 2
DAC output B (V
OUT
B) is routed to J4 - 4.
W12
1 - 2
DAC output C (V
OUT
C) is routed to J4 - 6.
W13
1 - 2
DAC output D (V
OUT
D) is routed to J4 - 8.
W15
CLOSED
Output op amp, U2, is configured for a gain of 2.
J4
2 - 1
DAC output A (V
OUT
A) is connected to the noninverting input of the output op amp,
U2.
3.2
Host Processor Interface
The host processor basically drives the DAC, so the proper operation of the
DAC depends on successful configuration between the host processor and
the EVM board. In addition, properly written code is also required to operate
the DAC.
A custom cable can be made specific to the host interface platform. The EVM
allows interface to the host processor through J2 header connector for the
serial control signals and the serial data input. The output can be monitored
through the J4 header connector.
An interface adapter card is also available for specific TI DSP starter kits, as
well as an MSP430-based microprocessor as mentioned in chapter 1 of this
manual. Using the interface card alleviates the tedious task of building
customized cables, and allows easy configuration of a simple evaluation
system.
The DAC8534 interfaces with any host processor capable of handling SPI
protocols, or the popular TI DSP. For more information regarding the DAC8534
data interface, refer to the data sheet (SBAS254).