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EVM Overview
1
EVM Overview
1.1
Features
DAC8562EVM:
•
Full-featured evaluation board for the DAC7562 or DAC8562
•
Onboard optional external reference selection
•
Wide selection of digital and I/O voltages
•
Hardware or software control of control logic
•
Compatible with the TI Modular EVM System
•
Onboard optional bipolar circuit configuration (requires installing components)
This manual covers the operation of the DAC8562EVM. For simplicity, the DAC7562 and DAC8562 are
referred to as DACx562 throughout this document; unless otherwise noted, the information applies to
either DAC device. Additionally, the abbreviation EVM and the term evaluation module are synonymous
with the DAC8562EVM.
1.2
Introduction
The DACx562 series of devices are 10-pin, 12-, 14-, or 16-bit, low-power, two-channel digital-to-analog
converters (DACs) that operates from a single 2.7V to 5.5V supply. These DACs include a 2.5V internal
reference voltage (disabled by default), giving a full-scale output range of 5V when placed in a gain of two
configuration. The EVM is designed to highlight both the features of the small,10-pin QFN package that
the DACx562 is available in, and the performance of either the 12-bit or 16-bit DAC. Digital communication
is controlled through a three-wire SPI protocol allowing for speeds up to 50MHz.
The DAC8562EVM is designed to give the user access to all pins on the DACx562. The evaluation
module allows the user to control the DAC logic using onboard jumpers, or digitally through the J2 header.
By default, the evaluation module is configured to be used with an onboard 2.5V external reference, but
can be easily modified to use the DAC internal reference by changing a jumper setting and enabling the
internal reference using software.
The DAC8562EVM is an evaluation module built to the TI Modular EVM System specification. It can be
connected to any modular EVM system interface card. The DAC8562EVM does not have an onboard
microprocessor and cannot run software by itself. To connect it to a computer, some type of interface is
required.
2
Analog Interface
For maximum flexibility, the DAC8562EVM can interface to multiple analog sources. Samtec part numbers
SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a 10-pin, dual-row, header at J1. This header
provides access to the analog input and output pins of the DACx562. Consult Samtec at
http://www.samtec.com
or call 1-800-SAMTEC-9 for a variety of mating connector options.
Table 1
summarizes the pinouts for analog interface J1.
Table 1. J1: Analog Interface Pinout
Pin Number
Signal
Description
J1.2
V
OUT
-0
Analog output 0
J1.4
V
OUT
-1
Analog output 1
External reference source input for
J1.20
V
REFIN
/V
REFOUT
V
REFIN
/V
REFOUT
J1.1-1.13 (odd)
GND
Analog ground connection
J1.17-1.19 (odd)
GND
Analog ground connection
J1.6-1.18 (even)
N/A
—
Op amp bipolar output (requires
J1.10
N/A
installed components)
J1.12 - J1.18 (even)
N/A
—
J1.15
V
REF
Buf
Buffered internal reference voltage
3
SBAU183A
–
May 2011
–
Revised June 2011
DAC7562EVM, DAC8562EVM
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2011, Texas Instruments Incorporated
