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FEATURES
Full-featured evaluation board for the AD7780
Standalone USB interface
Various linking options
PC software for control of AD7780
GENERAL DESCRIPTION
This user guide describes the evaluation board for the
which is a pin-programmable, low power, 24-bit sigma-delta
(Σ-Δ) ADC. The AD7780 is a complete analog front end for
low frequency measurement applications such as bridge sensor
systems. It contains one differential input and includes a low
noise instrumentation amplifier. The output data rate can be
programmed to 10 Hz or 16.7 Hz. The AD7780 also has an
on-board clock, eliminating the need for an external clock. It
employs a Σ-Δ conversion technique to realize up to 24 bits of
no missing codes performance. The input signal is applied to
an analog modulator. The modulator output is processed by an
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Arrow.com.
Downloaded from
Evaluation Board for the AD7780 24-Bit, Pin-Programmable,
Low Power, Sigma-Delta ADC
FUNCTIONAL BLOCK DIAGRAM
LOADCELL
CONNECTOR
ANALOG
AD7780
INPUTS
Evaluation Board User Guide
on-chip digital filter. The analog input channel of the AD7780
accepts analog input signals of ±V
update rate programmed to 10 Hz, the rms noise is 44 nV when
the gain is 128. Simultaneous 50 Hz/60 Hz rejection is available
at both output data rates.
Full data on the AD7780 is available in the AD7780 data sheet
available from Analog Devices, Inc., and should be consulted in
AD7780
conjunction with this user guide when using the evaluation board.
The evaluation board interfaces to the USB port of an IBM®-
compatible PC. Software is available with the evaluation board
that allows users to easily communicate with the AD7780.
Note that the AD7780 evaluation board software should be
installed before connecting the AD7780 evaluation board
to the PC.
Another component on the AD7780 evaluation board is the
ADP3303
high precision, low power, 3.3 V output voltage
regulator, which is used to power the USB/SPI interface.
AVDD
VOLTAGE
REGULATOR
USB
CONNECTOR
SPI/USB
INTERFACE
Figure 1.
Rev. 0 | Page 1 of 16
or ±V
REF
REF
PC AND
LabVIEW™
BASED
SOFTWARE
UG-078
/128. With the
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Related Manuals for Analog Devices AD7780
Summary of Contents for Analog Devices AD7780
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Page 1: Features
Various linking options at both output data rates. PC software for control of AD7780 Full data on the AD7780 is available in the AD7780 data sheet GENERAL DESCRIPTION available from Analog Devices, Inc., and should be consulted in This user guide describes the evaluation board for the AD7780 conjunction with this user guide when using the evaluation board. -
Page 2: Table Of Contents
UG-078 Evaluation Board User Guide TABLE OF CONTENTS Features ....................1 Evaluation Board Software ...............6 General Description ................. 1 Software Description ..............6 Functional Block Diagram .............. 1 Installing the Software ..............6 Revision History ................2 Using the Software ................6 Evaluation Board Hardware ............3 Main Window ................7 Power Supplies ................ -
Page 3: Evaluation Board Hardware
10 Hz. When LK15 is in Position 16.7 Hz, the output data rate is set to 16.7 Hz. LK16 LK16 is used to select the gain of the AD7780. With LK16 in Position 1, the gain is set to 1. With LK16 in Position 128, the gain of the AD7780 is set to 128. -
Page 4: Setup Conditions
Description AIN+ Subminiature BNC (SMB) connector. The analog input signal for the AIN(+) input of the AD7780 is applied to this socket. AIN− Subminiature BNC (SMB) connector. The analog input signal for the AIN(−) input of the AD7780 is applied to this socket. -
Page 5: Interfacing To The Evaluation Board
After the AD7780 evaluation board software is installed, AD7780 evaluation board to allow the evaluation board to inter- connect the board to the PC via J1 on the AD7780 evaluation face with the USB port of the PC. Because the board is powered... -
Page 6: Evaluation Board Software
USB cable, which accompanies the board. The software allows called Analog Devices with the subgroup AD7780 in the you to read conversion data from the AD7780. Data can be read Start menu of the taskbar. from the AD7780 and displayed or stored for later analysis. For... -
Page 7: Main Window
The File menu allows the user to read previously stored data for display or analysis, write the current set of data to a file for later This text box displays the output data rate of the AD7780. use, and exit the program. -
Page 8: Weighscale Demo Window
The output data rate the weighscale demo window (see Figure 4). The AD7780 and gain being used by the AD7780 are reflected in the Output evaluation board has a header, J3/J4, which allows you to Data Rate and Gain text boxes. -
Page 9: Evaluation Board Schematic And Artwork
Evaluation Board User Guide UG-078 EVALUATION BOARD SCHEMATIC AND ARTWORK Figure 5. AD7780 Evaluation Board Schematic Rev. 0 | Page 9 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from... - Page 10 UG-078 Evaluation Board User Guide Figure 6. AD7780 Evaluation Board—Solder Side View Rev. 0 | Page 10 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 11 Evaluation Board User Guide UG-078 Figure 7. AD7780 Evaluation Board—Component Side View Rev. 0 | Page 11 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 12 UG-078 Evaluation Board User Guide Figure 8. AD7780 Evaluation Board—Component Layout Diagram Rev. 0 | Page 12 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
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Page 13: Ordering Information
BILL OF MATERIALS Table 4. Reference Designator Description Manufacturer, Part No. Integrated Circuits U1, U5, U6 24-bit Σ-Δ ADC Analog Devices, AD7780BRZ USB controller Cypress Semiconductor Corporation, CY7C68013A- 56LFXC EEPROM Microchip Technology, Inc., 24LC64-I/SN 3.3 V Regulator Analog Devices, ADP3303ARZ-3.3... - Page 14 UG-078 Evaluation Board User Guide NOTES Rev. 0 | Page 14 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 15 Evaluation Board User Guide UG-078 NOTES Rev. 0 | Page 15 of 16 Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 16 By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement.
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