Evaluation Board User Guide UG-342 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluation Board for a 20-Bit Serial Input, Voltage Output DAC with Integrated Precision Reference Buffer Amplifiers FEATURES DEVICE DESCRIPTION Full-featured evaluation board for the AD5790 Link options PC control in conjunction with Analog Devices, Inc., system demonstration platform PC software for control The AD5790 is a high precision, 20-bit DAC with integrated precision reference buffer amplifiers designed to meet the requirements of precision control applications. The output range of the AD5790 is configured by two reference voltage inputs. The device is specified to operate with a dual power supply of up to 33 V. EVALUATION BOARD DESCRIPTION Complete specifications for the AD5790 are provided in the AD5790 data sheet, available from Analog Devices, and should be consulted in conjunction with this user guide when using the evaluation board. The EVAL-AD5790SDZ is a full-featured evaluation board, designed to allow the user to easily evaluate all features of the AD5790 voltage output, 20-bit digital-to-analog converter (DAC). The AD5790 pins are accessible at on-board connectors for external connection. The board can be controlled by two means: via the on-board connector (J3), or via the system demonstration platform (SDP) connector (J4). The SDP board allows the evaluation board to be controlled through the USB port of a Windows® XP (SP2 or later) or more recent 32-bit or 64-bit (Vista, Windows 7) PC using the AD5790 evaluation software. FUNCTIONAL BLOCK DIAGRAM POWER SUPPLY INPUTS PC USB PORT EXT +10V +5V VREFP SYSTEM DEVELOPMENT PLATFORM BOARD RFB AD5790 INV VOUT_BUF VOUT AD8675 VREFN VOUT –5V –10V 0V EXT 10344-001 PIN HEADER (J3) Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 16 UG-342 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 On-Board Connectors ..................................................................3 Evaluation Board Description......................................................... 1 Evaluation Board Software ...............................................................5 Device Description ........................................................................... 1 Software Installation .....................................................................5 Functional Block Diagram .............................................................. 1 Software Operation .......................................................................5 Revision History ............................................................................... 2 Main Window ................................................................................6 Evaluation Board Hardware ............................................................ 3 Evaluation Board Schematics and Artwork ...................................8 Power Supplies .............................................................................. 3 Ordering Information .................................................................... 14 Link Options ................................................................................. 3 Bill of Materials ........................................................................... 14 REVISION HISTORY 2/13—Rev. 0 to Rev. A Changes to Table 2 ............................................................................ 3 Replaced Evaluation Board Schematics and Artwork Section ... 8 Changes to Table 4 .......................................................................... 14 11/11—Revision 0: Initial Version Rev. A | Page 2 of 16 Evaluation Board User Guide UG-342 EVALUATION BOARD HARDWARE Connector J3 Pin Configuration The following external supplies must be provided: Figure 2 shows the pin configuration of Connector J3. • • • 5 V between the VCC and DGND inputs for the digital supply of the AD5790. Alternatively, place Link 1 in Position A to power the digital circuitry from the USB port via the SDP board (default). 7.5 V to 16.5 V between the VDD and AGND inputs for the positive analog supply of the AD5790. −2.5 V to −16.5 V between the VSS and AGND inputs for the negative analog supply of the AD5790. The analog and digital planes are connected at one location, close to the AD5790. To avoid ground loop problems, it is recommended not to connect AGND and DGND elsewhere in the system. Each supply is decoupled to the relevant ground plane with 10 µF and 0.1 µF capacitors. Each device supply pin is again decoupled with a 10 µF and 0.1 µF capacitor pair to the relevant ground plane. LINK OPTIONS The link options on the evaluation board should be set for the required operating setup before using the board. The functions of the link options are described in Table 3. Default Link Option Setup The default link options are listed in Table 1. By default, the board is configured with VREFP = +10 V and VREFN = −10 V for a ±10 V output range. 1 2 RESET DGND 3 4 CLR DGND 5 6 LDAC SDIN 7 8 DGND SCLK 9 10 SYNC Figure 2. Connector J3 Pin Configuration ON-BOARD CONNECTORS There are nine connectors on the AD5790 evaluation board PCB as outlined in Table 2. Table 2. On-Board Connectors Connector J1 J2 J3 J4 VOUT VOUT_BUF VREF VREFN VREFP Table 1. Default Link Options Link No. LK1 LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9 LK11 SDO 10344-015 POWER SUPPLIES Option A B A Removed Removed Removed Removed C Inserted Inserted Rev. A | Page 3 of 16 Function Digital power supply connector Analog power supply connector Digital interface pin header connector SDP board connector DAC output connector Buffered DAC output connector 5 V external reference voltage input connector (+10 V, +5 V, −10 V, and −5 V reference voltages are generated from this 5 V input or on-board ADR4550 DAC negative reference input connector DAC positive reference input connector UG-342 Evaluation Board User Guide Table 3. Link Options Link No. LK1 LK2 LK3 LK4 LK5 Description This link selects the source of the digital power supply. Position A selects the source from the SDP board. Position B selects the source from Connector J1. This link selects the positive reference voltage source. Position A selects an on-board generated 5 V. Position B selects an on-board generated 10 V. Position C selects an external voltage applied at Connector VREFP. This link is used in conjunction with LK4 to configure the mode of operation of the output amplifier. Position A configures the amplifier in unity gain. LK4 should be removed. 1 Position B configures the amplifier for a gain of 2. Lk4 should be inserted. 2 This link is used in conjunction with LK3 to configure the mode of operation of the output amplifier. When this link is inserted, LK3 should be in Position B to configure the amplifier for a gain of 2.2 When this link is removed, LK3 should be in Position A to configure the amplifier for unity gain.1 This link selects the state of the RESET pin. When this link is inserted, RESET is at logic low. When this link is removed, RESET is at logic high. LK6 This link selects the state of the CLR pin. When this link is inserted, CLR is at logic low. When this link is removed, CLR is at logic high. LK7 This link selects the state of the LDAC pin. When this link is inserted, LDAC is at logic low. When this link is removed, LDAC is at logic high. LK8 This link selects the negative reference voltage source. Position A selects an on-board generated −5 V. Position B selects AGND. Position C selects an on-board generated −10 V. Position D selects an external voltage applied at Connector VREFN. This link connects the output of Voltage Reference U5 to the reference scaling circuitry. This link connects the DAC output to the noninverting input of the output buffer amplifier. When this link is inserted, the DAC output is connected to the noninverting input of the output amplifier. When this link is removed, the DAC output is disconnected from the noninverting input of the output buffer amplifier and the DAC output voltage is accessible at the VOUT connector. LK9 LK11 1 2 The RBUF bit of the control register must be set to high to enable the unity-gain mode of operation. The RBUF bit of the control register must be cleared to low to enable the gain of 2 mode of operation. Rev. A | Page 4 of 16 Evaluation Board User Guide UG-342 EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION SOFTWARE OPERATION The AD5790 evaluation kit includes self-installing software on a CD. The software is compatible with Windows XP (SP2) and Vista (32-bit or 64-bit). If the setup file does not run automatically, you can run the setup.exe file from the CD. To launch the software, complete the following steps: Install the evaluation software before connecting the evaluation board and SDP board to the USB port of the PC to ensure that the evaluation system is correctly recognized when connected to the PC. 2. 10344-002 2. After installation from the CD is complete, power up the AD5790 evaluation board as described in the Power Supplies section. Connect the SDP board (via either Connector A or Connector B) to the AD5790 evaluation board and then to the USB port of your PC using the supplied cable. When the evaluation system is detected, proceed through any dialog boxes that appear. This completes the installation. From the Start menu, select Analog Devices, AD5790, then AD5790 Evaluation Software. The main window of the software then opens (see Figure 4). If the evaluation system is not connected to the USB port when the software is launched, a connectivity error displays (see Figure 3). Connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions. Figure 3. Connectivity Error Alert 10344-003 1. 1. Figure 4. Main Window Rev. A | Page 5 of 16 UG-342 Evaluation Board User Guide MAIN WINDOW The main window is divided into three tabs: Configure, Program Voltage, and Measure DAC Output. Configure The Configure section allows access to the control register, clearcode register, software control register, and DAC register and allows control of the RESET, CLR, and LDAC pins. Program Voltage 10344-004 The Program Voltage section programs the DAC register with the value calculated from the entered values: the positive voltage reference (VREFP), the negative voltage reference (VREFN), and the desired output voltage (see Figure 5). To begin the measurement, click START. The measurement can be halted at any time by clicking STOP. When the measurement is completed, a dialog box opens to allow you to save the data as a spreadsheet file with three columns of data. The first column is the DAC code, the second column is the DAC voltage in volts, and the third column is the INL error in LSBs, as shown in Figure 6. A graph of both the DAC output voltage vs. the DAC code and the INL error vs. the DAC code is displayed in the Measure DAC Output tab (see Figure 7). In the measurement example shown in Figure 7, measurements are taken in 10000 code steps beginning at Code 0 and finishing at Code 1,048,575 in a total of 100 measurements. With the number of power line cycles (NPLC) setting on the multimeter set to 1, the measurement takes ~10 sec to complete. To complete an all codes measurement requiring 1,048,575 measurement points takes ~1 day. Figure 5. Program Voltage Window Measure DAC Output The multimeter is controlled over a general-purpose interface bus (GPIB). When the multimeter is connected to the PC, first configure the multimeter via its front panel before taking a measurement. Figure 7 shows the measurement options. The software runs through a sequence of steps, programming the DAC register and measuring the DAC output voltage. The sequence begins with the software programming the DAC with the Start Code value, incrementing the programmed value at each step by the Code Step value, and finishing when the programmed value reaches the Stop Code value. A delay between measurements can be inserted, if required. The GPIB address of the multimeter must be specified. 10344-005 The Measure DAC Output section allows the PC to control an Agilent 3458A multimeter to measure and log the DAC output voltage. Figure 6. Saved Data Format If an Agilent 3458A multimeter is not connected to the PC, the software steps through the codes without taking any measurements. Rev. A | Page 6 of 16 UG-342 10344-006 Evaluation Board User Guide Figure 7. Measure DAC Output Tab Rev. A | Page 7 of 16 UG-342 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK 10344-007 Figure 8. Schematic of the AD5790 Circuitry Rev. A | Page 8 of 16 Evaluation Board User Guide UG-342 10344-008 Figure 9. Schematic of the Voltage Reference Circuitry Rev. A | Page 9 of 16 Evaluation Board User Guide 10344-009 UG-342 Figure 10. Schematic of the SDP Board Connector Rev. A | Page 10 of 16 UG-342 10344-010 Evaluation Board User Guide 10344-011 Figure 11. Component Placement Schematic Figure 12. Top Printed Circuit Board (PCB) Layer Schematic Rev. A | Page 11 of 16 Evaluation Board User Guide 10344-012 UG-342 10344-013 Figure 13. Inner First PCB Layer Schematic Figure 14. Inner Second PCB Layer Schematic Rev. A | Page 12 of 16 UG-342 10344-014 Evaluation Board User Guide Figure 15. Bottom PCB Layer Schematic Rev. A | Page 13 of 16 UG-342 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 4. Reference Designator C2, C5, C6, C10, C11, C13, C17, C19, C20, C23, C24, C34 to C36, C40 to C42 C3, C4, C8, C9, C14, C16, C18, C21, C22, C31, C32, C33, C37 to C39, C43 J1 J2 J3 J4 Part Description Capacitor, 0603, 0.1 µF, 16 V Part Number CM105X7R104K16AT Stock Code FEC 9406140 Capacitor +, 10 µF, 16 V, 10%, Case B TAJB106K016R FEC 498737 2-pin terminal block (5 mm pitch) CON\POWER 3-pin terminal block (5 mm pitch) CON\POWER3 20-pin (2 × 10) header CTB5000/2 FEC 151789 CTB5000/3 FEC 151790 Not applicable FEC 1022244 (36 + 36-pin strip) FEC 1324660 L1 to L4 LK1, LK3 LK2 120-way connector, 0.6 mm pitch, SDPSTANDARD-CONN Ferrite bead IND 3-pin SIL header and shorting link 6-pin (3 × 2) 0.1" header and shorting block 74279204 M20-9990345 and M7567-05 M20-9983646 and M7566-05 LK4 to LK7, LK9, LK11 LK8 2-pin (0.1" pitch) header and shorting shunt 8-pin (4 × 2) 0.1" header and shorting block M20-9990246 M20-9983646 and M7566-05 R1 to R12 R13, R15, R17, R19, R20 R16 R18 R21 R22 TP1 to TP7 U1 U2, U6 U8, U9 U4 U5 VOUT, VOUT_BUF, VREF, VREFN, VREFP SMD resistor Resistor, 1 kΩ, 0805, 5 ppm Resistor, 2 kΩ, 0805, 5 ppm Resistor, 0805, 680 Ω Resistor, 0805, 510 Ω Resistor, 0805, 1.5 kΩ Red test point 20-bit DAC Single op amp Dual op amp 64k I2C serial EEPROM 5 V reference Straight PCB mount SMB jack, 50 Ω MC 0.063W 0603 10k PCF0805-13-1K-B-T1 PCF0805-13-2K-B-T1 MC 0.1W 0805 5% 680R MC 0.1W 0805 5% 510R MC 0.1W 0805 5% 1K5 20-2137 AD5790BCPZ AD8675ARZ AD8676BRZ 24LC64-ISN ADR4550BRZ 1-1337482-0 Rev. A | Page 14 of 16 FX8-120S-SV(21) FEC 1635719 FEC 1022248 and 150410 FEC 148-535 and 150-411 (36-pin strip) FEC 1022247 and 150-411 FEC 1022244 and 150-411 (36-pin strip) FEC 9331700 FEC 31108863 FEC 1108872 FEC 9334785 FEC 9334637 FEC 9333924 FEC 240-333 AD5790BCPZ AD8675ARZ AD8676BRZ FEC 9758070 ADR4550BRZ FEC 1206013 Evaluation Board User Guide UG-342 NOTES Rev. A | Page 15 of 16 UG-342 Evaluation Board User Guide NOTES 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 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. ©2011–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG10344-0-2/13(A) Rev. A | Page 16 of 16