ANALOG DEVICES EVAL-LTC2420-EBZ Evaluation Board User Guide
- June 16, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES EVAL-LTC2420-EBZ Evaluation Board
FEATURES
- Fully featured evaluation board for the LTC2420
- QuikEval evaluation software compatible
EVALUATION KIT CONTENTS
- EVAL-LTC2420-EBZ evaluation board
- Ribbon cable to connect to the Linduino DC2026C
EQUIPMENT NEEDED
- DC2026C controller board (must be purchased separately)
- PC running Windows® 7 or Windows 10
- Analog signal source
SOFTWARE NEEDED
- QuikEval evaluation software
DOCUMENTS NEEDED
- LTC2420 datasheet
- EVAL-LTC2420-EBZ design files (see the EVAL-LTC2420-EBZ product page)
EVALUATION BOARD PHOTOGRAPH
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS.
REVISION HISTORY
- 1/2023—Revision 0: Initial Version
EVALUATION BOARD HARDWARE
EVALUATION BOARD OVERVIEW
The EVAL-LTC2420-EBZ requires the EEPROM power and DC2026C controller board
connections described in the DC2026C Connections section. The ribbon cable
provided in the evaluation kit connects the EVAL-LTC2420-EBZ and the DC2026C
via the J1 connector. Turrets are provided to connect the EVAL-LTC2420-EBZ to
the power supplies. The EVAL-LTC2420-EBZ has other features to allow the user
to select an external reference and to select 50 Hz or 60 Hz noise rejection
and offers a fast mode at 100 SPS with 16-bit noise and 12-bit total
unadjusted error.
POWER SUPPLIES
The EVAL-LTC2420-EBZ is powered by the DC2026C. No external power supply is
required.
DIGITAL INTERFACE
DC2026C Connections
The EVAL-LTC2420-EBZ uses the DC2026C to integrate with the QuikEval
evaluation software through the SPI. Use the provided ribbon cable to connect
J1 of the EVAL-LTC2420-EBZ to J1 of the DC2026C. When this connection is made,
the DC2026C powers the electrically erasable programmable read-only memory
(EEPROM) on the EVAL-LTC2420-EBZ. The QuikEval evaluation software uses the
EEPROM to identify the EVAL-LTC2420-EBZ and load the proper module. To ensure
proper serial transfers and compatibility, set JP3 of the DC2026C to the 5 V
position.
DC2026C Connector Pin Descriptions
Figure 2 shows the pins for the DC2026C J1 connector. For descriptions of each
pin, see Table 1.
GENERAL DESCRIPTION
The EVAL-LTC2420-EBZ is a fully featured evaluation board that evaluates the LTC2420, a 20-bit, μPower, no latency, ΔΣ analog-to-digital converter (ADC). The EVAL-LTC2420-EBZ uses QuikEval evaluation software to provide an intuitive graphical user interface (GUI) that configures and controls the LTC2420 using the serial peripheral interface (SPI). The LTC2420 is used for various data acquisition applications such as weigh scales or gas analyzers. The LTC2420 accepts any external reference voltage from 0.1 V to VCC and can be configured to reject 50 Hz or 60 Hz interference. For full specifications on the LTC2420, see the LTC2420 data sheet, which must be consulted with this user guide when using the EVAL-LTC2420-EBZ.
Table 1. DC2026C Connector J1 Pin Descriptions
pin No. Mnemonic Description
| 1 | V+ | Unregulated voltage from the DC2026C, |
|---|---|---|
| nominally 7 V | ||
| 2 | VCCIO | I/O voltage set by JP3 on the DC2026C |
| 3 | GND | Ground |
| 4 | SCL/SCK | Serial clock from the DC2026C |
| 5 | MISO | Serial data from the LTC2420 |
| 6 | CS | Chip select from the DC2026C |
| 7 | SDA/MOSI | Serial data from the DC2026C |
| 8 | GND | Ground |
| 9 | EEDA | Serial data for EEPROM |
| 10 | EEVCC | VCC for EEPROM |
| 11 | EESCL | Serial clock for EEPROM |
| 12 | EEGND | Ground for EEPROM |
| 13 | GND | Ground |
| 14 | NC | No connection |
REFERENCE
By default, the EVAL-LTC2420-EBZ uses the 5 V LT6660-5 reference. To use an
external reference, place the EVAL-LTC2420-EBZ JP1 jumper into the EXT
position and apply an external reference to E3 (VREF).
ON-BOARD CONNECTORS
Table 2 describes the seven on-board connectors on the EVALLTC2420- EBZ.
Table 2. On-Board Connectors
Connector Function
| J1 | SPI/I2C interface pin header connector |
|---|---|
| JP1 | VREF select |
| JP2 | 50Hz REJ/ 60Hz REJ select |
| E1 | VCC |
| E2 | GND |
| E3 | VREF |
| E4 | VIN |
GETTING STARTED
The QuikEval evaluation software controls and configures the onboard LTC2420 through the DC2026C.
SOFTWARE INSTALLATION PROCEDURES
Before connecting the DC2026C to the EVAL-LTC2420-EBZ, take the following
steps to set up the EVAL-LTC2420-EBZ for initial use in the QuikEval
evaluation software:
- Download the QuikEval evaluation software package to start the software installation.
- Open the ltcqev.exe file and follow the instructions in the folder to complete the software installation process.
EVALUATION HARDWARE SETUP
When the QuikEval evaluation software installation is complete, take the
following steps to set up the DC2026C and the EVALLTC2420- EBZ together:
- Connect the DC2026C to the EVAL-LTC2420-EBZ via the J1 connectors with the ribbon cable provided.
- Connect the input voltage between VIN (E4) and GND (E2) on the EVAL-LTC2420-EBZ.
- Start the QuikEval evaluation software (see the Software Operation section).
SOFTWARE OPERATION
To start the QuikEval evaluation software, from the Start menu, click Analog
Devices > QuikEval. The software window opens (see Figure 3) until the
software recognizes the EVAL-LTC2420- EBZ. When the software recognizes the
EVAL-LTC2420-EBZ, the main software window in Figure 4 opens.
MAIN WINDOW
In the main QuikEval evaluation software window (see the Software Operation),
the output voltage, a histogram, and a time domain output are displayed.
Various settings for the EVAL-LTC2420-EBZ can be configured in the tools menu,
including the calibration, data logging, and display units. Refer to the
LTC2420 data sheet for more information on the device features associated with
the different tab functions that are described in the following sections.
ADC Calibration
A single-point or two-point calibration can be set up to increase display
accuracy. User-defined units can also be displayed.
QuikEval Options
Options include setting the number of points in the average, the number of
samples displayed, and the data timeout. The user can also specify the output
display in part per million (PPM), volts, ADC counts, or user-defined units.
Data Logging
The EVAL-LTC2420-EBZ can be set up for data logging as shown in the example
configuration (see Figure 7). Options include sample period, number of points
to log, and how long to log data. Click on the Begin button to start the data
logging.
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit
boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
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. Your
use of the Evaluation Board shall signify your acceptance of the Agreement.
This Agreement is made by and between you (“Customer”) and Analog Devices,
Inc. (“ADI”), with its principal place of business at Subject to the terms and
conditions of the Agreement, ADI hereby grants to Customer a free, limited,
personal, temporary, non-exclusive, non-sublicensable, non-transferable
license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer
understands and agrees that the Evaluation Board is provided for the sole and
exclusive purpose referenced above, and agrees not to use the Evaluation Board
for any other purpose. Furthermore, the license granted is expressly made
subject to the following additional limitations: Customer shall not (i) rent,
lease, display, sell, transfer, assign, sublicense, or distribute the
Evaluation Board, and (ii) permit any Third Party to access the Evaluation
Board. As used herein, the term “Third Party” includes any entity other than
ADI, Customer, their employees, affiliates and in-house consultants. The
Evaluation Board is NOT sold to Customer; all rights not expressly granted
herein, including ownership of the Evaluation Board, are reserved by ADI.
CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be
considered the confidential and proprietary information of ADI. The customer
may not disclose or transfer any portion of the Evaluation Board to any other
party for any reason. Upon discontinuation of use of the Evaluation Board or
termination of this Agreement, Customer agrees to promptly return the
Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customers may not
disassemble, decompile or reverse engineer chips on the Evaluation Board.
Customer shall inform ADI of any occurred damages or any modifications or
alterations it makes to the Evaluation Board, including but not limited to
soldering or any other activity that affects the material content of the
Evaluation Board. Modifications to the Evaluation Board must comply with
applicable law, including but not limited to the RoHS Directive. TERMINATION.
ADI may terminate this Agreement at any time upon giving written notice to
Customer. The customer agrees to return to ADI the Evaluation Boardat that
time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS
PROVIDED “AS IS” AND ADI
MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
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