EVM Overview
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EVM Overview
This section gives a general overview of the DAC8580/81 Evaluation Module (EVM) and instructions on
setting up and using this evaluation module. Throughout this document, the abbreviation EVM and the
phrase evaluation module are synonymous with the DAC8580/81EVM. Unless otherwise specified,
operation of the DAC8580EVM is identical to the operation of the DAC8581EVM; therefore, the
abbreviation DAC8580/81EVM is used throughout this document.
1.1
Features
This EVM features the DAC8580/81 digital-to-analog converter (DAC). It provides a quick and easy way to
evaluate the functionality and performance of the high-resolution, serial input DAC. The EVM provides the
serial interface header to easily attach to any host microprocessor or TI DSP-based system for
communication.
1.2
Power Requirements
The following sections describe the power requirements of this EVM.
1.2.1
Supply Voltage
The dc power supply for the digital section (DV
DD
) of the device under test (DUT) installed on this EVM is
selectable b5 VD and +3.3 VD via the W1 jumper, although the digital pull-up resistors are
permanently tied to +5 VD. The +5-VD source can come from the J5-1 terminal (if installed) or the J6-10
terminal and is referenced to ground through the J5-2 and J6-5 terminals, respectively.
The dc power supply requirements for the analog section (AV
DD
and AV
SS
) of the DUT installed on this
EVM is provided by +5 VA that can come from the J5-3 terminal (if installed) or the J6-3 terminal, and -5
VA that can come from J6-4 terminal, respectively. The analog ground is referenced through the J1-2
terminal (if installed) or the J6-6 terminal. The high voltage supply via V
CC
and V
SS
is typically ±15 V but
can range from ±4.5 V minimum to ±18 V maximum and connect through the J1-1 and J1-3 terminals,
respectively (if installed), or through the J6-1 and J6-2 terminals. All of the analog power supplies are
referenced to analog ground through the J1-2 and J6-6 terminals.
The V
CC
supply sources the positive rail of the external output operational amplifier, U2, as well as the
REF02 reference source, U3, and the buffer operational amplifier, U8A. The negative rail of U2 is supplied
by V
SS
, although U2 also can be selected to be connected to AGND via W5 jumper. The external
operational amplifiers, U2 and U8B, are installed as an option to provide output signal conditioning and for
any other output configurations desired.
CAUTION
To avoid potential damage to the EVM board, ensure that the correct cables
are connected to their respective terminals as labeled on the EVM board.
Stresses above the maximum listed voltage ratings may cause permanent
damage to the device.
1.2.2
Reference Voltage
The externally-gen5 V
DC
, via REF02, or +4.096 V
DC
, via REF3040, precision voltage reference is
jumper selectable via W4. The reference voltage for the DUT can be chosen between the installed
precision reference circuits or user-supplied reference via TP1. The REF02, U3, is the reference source
installed from the factory whereas the REF3040, U4, is optional. Because the REF3040 is pin compatible
with the REF31xx and REF32xx reference family, the user can choose between these wide varieties of
precision references. The REF02 is a 10 ppm/°C with excellent line regulation and stability. The chosen
reference source provides the DAC8580/81 voltage output range. An external reference source of up to
AV
DD
can be applied to the reference input via TP1 if other than the onboard reference source is desired.
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DAC8580/81 Evaluation Module
SLAU173A – December 2005 – Revised November 2009
Copyright © 2005–2009, Texas Instruments Incorporated
