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User Guide | UG-2001 DC2873A Evaluating the LTC2688 16-Channel, 16-Bit Voltage Output SoftSpan DAC PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | 1 of 12
FEATURES
►Fully featured evaluation board for the LTC2688 multichannel voltage output DAC ►Flexible output power supply configuration ►Easy connection to external loads ►Test points to monitor DAC status signals ►ACE evaluation software compatible EVALUATION KIT CONTENTS ►DC2873A-B evaluation board ►Ribbon cable to connect to the Linduino DC2026C controller board EQUIPMENT NEEDED ►DC2026C controller board (must be purchased separately) ►PC running Windows® 7 or Windows 10 ►Voltmeter ►Power supply SOFTWARE NEEDED ►ACE evaluation software (available for download from the DC2873A product page) DOCUMENTS NEEDED ►LTC2688 data sheet ►DC2873A-B design files (see the DC2873A product page) GENERAL DESCRIPTION The DC2873A-B is a fully featured evaluation board that is used to evaluate the LTC2688, a 16-channel, precision voltage output digital-to-analog converter (DAC). The DC2873A-B is controlled through a serial peripheral interface (SPI) from the J1 connector. The SPI signals are sent from the DC2026C controller board through the ribbon cable that is connect- ed to the DC2873A-B. The DC2873A-B uses Analysis, Control, Evaluation (ACE) software to provide an intuitive graphical user interface (GUI) that configures and controls the LTC2688 using the SPI interface. The LTC2688 is used for various voltage mode biasing applications such as optical modulators for data communications. The output voltage range for each channel is software selectable, and any channel can be routed to the DC2873A-B MUX pin, allowing either the channel voltage or current to be externally monitored. For full specifications on the LTC2688, see the LTC2688 data sheet, which must be consulted in conjunction with this user guide when using the DC2873A-B. EVALUATION BOARD PHOTOGRAPH 001 Figure 1. DC2873A-B Evaluation Board
analog.com Rev. 0 | 2 of 12
REVISION HISTORY
6/2021—Revision 0: Initial Version
the DC2873A-B to the power supplies. optional features do not need to be changed for normal operation. E1 (V1+) and connect E2 (GND) and E3 (V−) to ground (GND). applications that require a negative supply. must be less than or equal to V1+. Figure 2. DC2873A-B Hardware Connections
the EEPROM to identify the DC2873A-B and load the proper plugin. powers the IOVCC pin of the LTC2688, which is nominally 5 V. scriptions of each pin, see Table 1. Figure 3. DC2026C J1 Connector Pins Table 1. DC2026C Connector J1 Pin Descriptions
1 V+ Unregulated voltage from the DC2026C,
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 DC2873A-B
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 Power supply (VCC) for EEPROM
11 EESCL Serial clock for EEPROM
12 EEGND Ground for EEPROM
13 GND Ground
14 NC No connection
compliance voltages, output currents, and internal die temperature. more details on the multiplexer functionality and register structure. Table 2 describes the on-board connectors on the DC2873A-B. Table 2. On-Board Connectors
LTC2688 through the DC2026C.
- Download the ACE evaluation software package from the
start the ACE evaluation software installation.
- Connect the DC2026C to the DC2873A-B via the J1 connectors
with the ribbon cable provided (see Figure 2).
- Connect the desired power supplies to E1 (V1+), E2 (GND),
and E3 (V−) on the DC2873A-B.
- Connect the desired load to the appropriate channel on the
- Connect the load ground to a ground (GND) turrets (either E4
- Connect the DC2026C to a PC or laptop using the USB cable.
- Start the ACE evaluation software (see the Software Operation
Figure 4. Interface Window
applied to the selected pin or supplied internally. Mode dropdown box to bring up the dither options (see Figure 7). using the dropdown boxes to select from a fixed list of options. Figure 6. Toggle View
Figure 7. Dither View
Figure 8. LTC2688-16 Memory Map View
analog.com Rev. 0 | 10 of 12 HARDWARE A comprehensive list of frequently asked questions (FAQ) is availa- ble on the LTC2688 FAQs page in the EngineerZone™ site. For other questions, submit them to the Precision DACs section of the EngineerZone site.
Figure 9. DC2873A-B Schematic
ORDERING INFORMATION
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 One Technology Way, Norwood, MA 02062, USA. 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. 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. Customer 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. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT 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. ©2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Rev. 0 | 12 of 12 BILL OF MATERIALS Table 3. DC2873A-B Bill of Materials
4 C1, C6, C7, C16 10 µF, X5R, 25 V, 10%, 1206 capacitors Murata GRM31CR71E106KA12L
5 JP1 to JP5 Male, 1 × 3, 2 mm connector headers Wurth Elektronik 62000311121
1 J1 Male, 2 × 7, 2 mm connector header Molex 87831-1420
1 LED1 Red, clear, 3020 (1208) light emitting diode (LED)ROHM SML-012V8TT86
1 Q1 N channel, 60 V, 300 mA metal oxide semiconductor field
1 R11 1 kΩ, 1%, 1/10 W, 0603 resistor Vishay CRCW06031K00FKEA
1 U3 EEPROM, 2 kb IC Microchip 24LC025-I/ST
5 JP1 to JP5 Female, 2-position, 2 mm connector shunt Wurth Elektronik 60800213421
1 U1 16-channel, 16-bit, voltage output DAC Analog Devices LTC2688CUJ-16#PBF
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).