Texas Instruments DAC8554EVM, User Manual, Page: 3 / 24

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1.3 EVM Basic Functions
JMP11
JMP12
JMP13
JMP14
External
Reference
Module
+5V
A
V
DD
+3.3V
A
(J2A)
(J2B)
DAC Module
(J4A)
(J4B)
8 CH
(J1)
(J5)
(J3A)
(J3B)
4 CH
JMP15
JMP16
JMP9
JMP10
DAC Out
V
SS
V H
REF
TP4
TP3
V
CC
GND
V
SS
GND
V
DD
+5V
A
+3.3V
A
A0
A1
EN
DIN
LDAC
SCLK
SYNC
JMP5
JMP6
JMP4
A0
JMP3
A1
JMP8
V H
REF
TP2
V
SS
V
CC
V L
REF
Output
Buffer
Module
Overview
The DAC8554EVM is designed to provide a demonstration platform for testing certain operational
characteristics of the DAC8554 digital-to-analog converter. Functional evaluation of the DAC8554 can be
accomplished with the use of any microprocessor, TI DSP or some sort of waveform generator.
Headers J2A (top side) and J2B (bottom side) are pass-through connectors provided to interface a host
processor or waveform generator with the DAC8554EVM using a custom-built cable. These connectors
enable the control signals and data to pass between the host and the device.
A mating adapter interface card (5-6k adapter interface) is also available to fit with TI’s TMS320C5000 and
TMS320C6000 DSP Starter Kits (DSKs). This card resolves most of the trouble involved with building a
custom cable. Additionally, there is also an MSP430-based platform (HPA449) that uses the MSP430F449
microprocessor, to which this EVM can connect and interface as well. For more details or information
regarding the 5-6k adapter interface card or the HPA449 platform, please contact your Texas Instruments
representative, visit the
TI web site or email the Data Converter Applications Support Team at
dataconvapps@list.ti.com.
The DAC outputs can be monitored through the selected pins of the J4 header connector. All outputs can
be switched through their respective jumpers—JMP11, JMP12, JMP13 and JMP14—for the purpose of
stacking. Stacking allows a total of eight DAC channels to be used, provided the A0 and A1 address
signals are unique for each EVM board stacked.
In addition, the option of selecting one DAC output that can be fed to the noninverting side of the output
op amp, U2, is also possible by using a jumper across the selected pins of J4. The output op amp (U2)
must first be correctly configured for the desired waveform characteristic. For more information, refer to
Section 3 of this user’s guide.
A block diagram of the EVM is shown in Figure 1 .
Figure 1. DAC8554EVM Functional Block Diagram
SBAU121 – January 2006 DAC8554EVM User's Guide 3