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Overview
2
Overview
2.1
Features
ADS1675REF Features:
•
Full-featured evaluation board for the ADS1675 24-bit, Delta-Sigma (
ΔΣ
) analog-to-digital converter
•
Analog inputs can be applied to the ADC through an analog input driver circuit
•
Onboard voltage references
•
Clock options: onboard adjustable frequency default setup is 32MHz
•
Supports both serial CMOS and low-voltage differential signaling (LVDS) interface modes by two
different versions of software plug-in
ADCPro™ Plug-In Features:
•
Easy-to-use evaluation software for Microsoft
®
Windows
®
XP
•
Data collection to text files
•
Built-in analysis tools including scope, FFT, and histogram displays
•
Complete control of board settings
•
Easily expandable with new analysis plug-in tools from Texas Instruments
This kit combines the ADS1675REF board with the FPGA and SDRAM-based XEM3010 board, and
includes ADCPro™ software for evaluation.
You can connect the ADS1675REF to the XEM3010 board and then to a computer via an available USB
port. This manual shows how to use the XEM3010 as part of the ADS1675REF kit, but does not provide
technical details about the XEM3010 itself. Refer to the Opal Kelly website (at
) for
specific details about the XEM3010-1500.
ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. ADCPro
has a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.
You control the ADS1675REF with a plug-in that runs in ADCPro. For more information about ADCPro,
see the
ADCPro™ Analog-to-Digital Converter Evaluation Software User's Guide
(literature number
), available for download from the TI web site.
This manual covers the operation of both the ADS1675REF and the ADS1675REF Plug-in for ADCPro.
Throughout this document, the abbreviation REF and the term reference board are synonymous with the
ADS1675REF.
2.2
Introduction
The ADS1675REF is a 24-bit,
ΔΣ
analog-to-digital converter that operates from independent AVDD (+5V)
and DVDD (+3V) supplies. The analog input pre-amplifier
can be powered from +9V and -4V
supplies. The XEM3010 FPGA processor board can be supplied either with a +5V external wall adapter
power supply or with +5V (JP4) from the ADS1675REF board itself.
The maximum sample rate of the ADS1675 is 4MSPS. The maximum output clock speed is 96MHz.
The output interface can be configured as either CMOS or LVDS interface; the ADS1675REF works easily
with both interfaces.
There are two digital decimation filters built into the ADS1675 device. The first one is low-latency filter that
can reduce digital processing time, but only provide narrow signal bandwidth; this filter is best used for fast
digital processing applications. The second option is a wide-bandwidth digital filter that can provide a
much wider and flat signal bandwidth, but with slower processing time.
The ADS1675REF hardware platform consists of a two-board solution: one ADS1675REF printed circuit
board (PCB) plus one FPGA processor board (XEM3010). The ADS1675REF hardware uses a very
common FPGA Spartan-3, Micron 16-MByte (16-bit word-wide) synchronous DRAM (SDRAM) chip,
Cypress CY22393 PLL, and USB 2.0 microcontroller.
3
SBAU162A – December 2009 – Revised September 2010
ADS1675REF
Copyright © 2009–2010, Texas Instruments Incorporated