EVAL-AD7291SDZ

Evaluation Board User Guide UG-253 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 the AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor FEATURES DEVICE DESCRIPTION Full-featured evaluation board for the AD7291 Link options On-board analog bias-up circuit PC control in conjunction with system demonstration platform (SDP) PC software for control The AD7291 is a 12-bit, 8-channel successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3 V power supply and features an I2C®compatible interface. Each AD7291 provides a 2-wire serial interface compatible with I2C interfaces. The AD7291 offers a programmable sequencer, which enables the selection of a preprogrammable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference. EVALUATION BOARD DESCRIPTION The EVAL-AD7291SDZ is a full-featured evaluation board, designed to allow the user to easily evaluate all features of the AD7291. The evaluation board can be controlled via the system demonstration platform (SDP) connector (J1). The SDP board allows the evaluation board to be controlled through the USB port of a PC using the AD7291 evaluation software. The AD7291 includes a high accuracy band-gap temperature sensor, which is monitored and digitized by the 12-bit ADC to give a resolution of 0.25°C. Complete specifications for the AD7291 are provided in the AD7291 data sheet, available from Analog Devices, Inc., which should be consulted in conjunction with this data sheet when using the evaluation board. On-board components include the ADP1706 low dropout CMOS linear regulator; the AD8022 high speed, low noise amp; and the AD8066 high performance 145 MHz FastFET™ amp. The evaluation board features analog bias-up circuitry. Bipolar signals are input via the VIN SMB connector and are biased up by the on-board bias-up buffer circuit. The biased up signal is available at the BIASED_VIN2 SMB and can be applied to any one of the eight VINx SMB connectors using an SMB-SMB cable. Various link options are described in the Evaluation Board Hardware section. The Link Options section of this user guide should be consulted when configuring the board for standalone operation. FUNCTIONAL BLOCK DIAGRAM USB CONNECTION TO PC EVAL-AD7291SDZ VIN SCL SDA AS1 AS0 VDRIVE VBIASED VIN0 V0 AD7291 VDRIVE VIN7 VDD DGND VDRIVE –5V AGND +5V Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. BIAS-UP BATTERY Rev. A | Page 1 of 16 V7 3.3V REGULATOR EXT_VCC AGND 09710-001 SDP BOARD UG-253 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Software Installation .....................................................................5 Evaluation Board Description......................................................... 1 Software Operation .......................................................................5 Device Description ........................................................................... 1 Main Window ................................................................................6 Functional Block Diagram .............................................................. 1 Command Register .......................................................................7 Revision History ............................................................................... 2 Alert Limits ....................................................................................7 Evaluation Board Hardware ............................................................ 3 Sample ADC/Continuously Sample ...........................................7 Power Supplies .............................................................................. 3 Evaluation Board Schematics and Artwork ...................................9 Link Options ................................................................................. 3 Ordering Information .................................................................... 13 Sockets/Connectors...................................................................... 4 Bill of Materials ........................................................................... 13 Evaluation Board Software .............................................................. 5 REVISION HISTORY 6/11—Rev. 0 to Rev. A Changes to Features and Evaluation Board Description Sections .............................................................................................. 1 Changes to Table 1 and Table 2 ....................................................... 3 Changes to Figure 9 Through Figure 14 ........................................ 8 Changes to Bill of Materials, Table 3 ............................................ 12 3/11—Revision 0: Initial Version Rev. A | Page 2 of 16 Evaluation Board User Guide UG-253 EVALUATION BOARD HARDWARE POWER SUPPLIES LINK OPTIONS Care should be taken before applying power and signals to the evaluation board to ensure that all link positions are as required by the operating mode. Table 1 shows the position in which all the links are set when the evaluation board is packaged. The links are set so that control signals and VDRIVE are supplied by the SDP board. When using this evaluation board with the SDP board, apply +5 V, −5 V, and GND to Connector J2. VDRIVE is supplied by the SDP board, and VDD is supplied by an on-board regulator. Each supply is decoupled on the EVAL-AD7291SDZ using 10 µF and 0.1 µF capacitors. A single ground plane is used on this board to minimize the effect of high frequency noise interference. Multiple link (LKx) and solder link (SLx) options must be set correctly to select the appropriate operating setup before using the evaluation board. The default link positions are shown in Table 1 and the functions of these options are outlined in Table 2. Table 1. Link Options Link No. LK1 LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9 Position Inserted Inserted Inserted Inserted Position A Position A Position A Inserted Inserted LK10 LK11 LK12 LK13 LK14 LK20 SL1 SL2 SL3 SL4 Inserted Inserted Inserted Inserted Inserted Position A Position B Position A Position B Position B Function This link option pulls the AD7291 VIN0 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN1 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN6 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN7 input to GND via a 10 kΩ resistor. Connects the PD/RST pin to VDRIVE voltage. When in Position A, the 3.3 V VCC supply is supplied by the on-board regulator, ADP1706. When in Position A, the VDRIVE supply is taken from the SDP board via VIO_CONNECTOR. When inserted, the VREF signal is connected to the VREF test point. When inserted, the buffered internal reference voltage is divided by a factor of 3 and used as the bias input for U10. This link option pulls the AD7291 VIN2 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN3 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN4 input to GND via a 10 kΩ resistor. This link option pulls the AD7291 VIN5 input to GND via a 10 kΩ resistor. This link option connects +5 V to Pin 1 of J1. In Position A, the buffered internal reference is used as the bias input for U10. Buffered output from SMA Connector V7 is routed to SMB Connector BUFF_V7. In Position A, there is no amplifier included in the Analog Input Channel VIN1 path. Buffered output from SMA Connector V0 is routed to SMB Connector BUFF_V0. In Position B, there is an amplifier included on the Analog Input Channel VIN0 path. Rev. A | Page 3 of 16 UG-253 Evaluation Board User Guide SOCKETS/CONNECTORS There are 16 SMB input sockets relevant to the operation of the AD7291 on this evaluation board. The functions of these sockets are outlined in Table 2. Table 2. Socket/Connector Functions Socket BIASED_VIN2 BUFF_V0 BUFF_V7 EXT_OFFSET J3 J4 J5 J6 J8 J9 J10 J11 J12 J13 VIN VREF_BUFF Function SMB socket for the output of the bias up circuit SMB socket for the buffered V0 input (SL3 must be in Position A and SL4 must be in Position B) SMB socket for the buffered V7 input (SL1 must be in Position A) SMB socket for an external bias input, which is applied to U10 V0 SMB socket for a single-ended input that is applied to the VIN0 pin of the AD7291 V1 SMB socket for a single-ended input that is applied to the VIN1 pin of the AD7291 V6 SMB socket for a single-ended input that is applied to the VIN6 pin of the AD7291 V7 SMB socket for a single-ended input that is applied to the VIN7 pin of the AD7291 V2 SMB socket for a single-ended input that is applied to the VIN2 pin of the AD7291 V3 SMB socket for a single-ended input that is applied to the VIN3 pin of the AD7291 V4 SMB socket for a single-ended input that is applied to the VIN4 pin of the AD7291 V5 SMB socket for a single-ended input that is applied to the VIN5 pin of the AD7291 SMB socket connected to the VREF pin of the AD7291 (by default the internal reference is used) SMB socket connected to the PD/RST pin of the AD7291 SMB socket to connect input to the bias-up circuit SMB socket for the output of the buffered reference Rev. A | Page 4 of 16 Evaluation Board User Guide UG-253 EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION SOFTWARE OPERATION The AD7291 evaluation kit includes self-installing software on a CD. The software is compatible with Windows® XP (SP2) and Windows Vista® (32-bit). If the setup file does not run automatically, you can run setup.exe from the CD. To launch the software, complete the following steps: 1. From the Start menu, select Analog Devices – AD7291 > AD7291 Evaluation Software. The main window of the software is displayed (see Figure 3). 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. If the evaluation system is not connected to the USB port when the software is launched, a connectivity error is displayed (see Figure 2). Connect the evaluation board to the USB port of the PC, wait a number of seconds, and click Rescan. Follow the instructions. 09710-002 2. After installation from the CD is complete, power up the AD7291 evaluation board as described in the Power Supplies section. Connect the SDP board (Connector A) to the AD7291 evaluation board (Connector J1) 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. Figure 2. Connectivity Error Alert 09710-003 1. Figure 3. Main Window Rev. A | Page 5 of 16 UG-253 Evaluation Board User Guide MAIN WINDOW the alert limits can be ascertained at any time by clicking READ ALERT STATUS. Figure 4 shows the main window of the AD7291 evaluation software. The device is configured via the COMMAND REGISTER button. Samples can be taken continuously or one at a time, depending on whether CONTINUOUSLY SAMPLE or SAMPLE ADC is selected. Enabling the FLASH LED button on this window causes the orange LED1A on the SDP board to flash, which is a useful debug tool. 09710-004 The AD7291 has nine pairs of limit registers. Each pair stores high and low conversion limits for each analog input channel and the internal temperature sensor, which can be programmed via the ALERT LIMITS SETUP button. If a limit is violated, the ALERT A or ALERT B indicator turns red. Further details on The lower section of the window graphically displays AD7291 data. The tab setting in the data display window allows the user to swap between displaying the ADC analog input channel conversion results and the internal temperature sensor results. Figure 4 depicts continuous analog input channel conversion results for VIN0. Figure 4 shows the main panel with the TSENSE RESULTS tab selected. Figure 4. AD7291 Main Window Displaying TSENSE and TSENSE Average Results Rev. A | Page 6 of 16 Evaluation Board User Guide UG-253 COMMAND REGISTER The Command Register section of the AD7291 data sheet should be consulted before configuring the control register settings. To configure the command register, click COMMAND REGISTER (see Figure 4). ideal mode of operation for system monitoring. While in this mode, the conversion results from the analog input channels are not displayed on the user interface. Click WRITE to update the control register. ALERT LIMITS 09710-005 The AD7291 has nine pairs of limit registers. Each pair stores high and low conversion limits for each analog input channel and the internal temperature sensor. Each pair of limit registers has one associated hysteresis register. To program the alert limits and associated hysteresis register, click ALERT LIMITS SETUP on the main window. Figure 5. Command Register When DB5/NOISE DELAYED BIT TRIAL SAMPLING is enabled, critical sampling intervals and bit trials are delayed when there is activity on the I2C bus, thus ensuring improved dc performance of the AD7291. The active polarity of the ALERT pin is configured as active low if the DB3/POLARITY OF ALERT PIN is enabled. Conversely, it is set to active high operation if this bit is disabled. DB2/CLEAR ALERT clears the content of the alert status register. Once the content of the alert status register is cleared, this bit should be reprogrammed to Logic 0 to ensure future alerts are detected. Enabling the DB1/RESET bit in the command register resets the content of all internal registers in the AD7291 to their default values, including the command register itself. Disable this bit once the reset is complete to allow the internal registers to be reprogrammed. The DB0/AUTOCYCLE MODE enables autocycle mode. In autocycle mode, the AD7291 is configured to convert continuously on the selected sequence of channels (both analog input channels and the temperature sensor channel), making it the 09710-006 Select the ADC channels required for conversion in the sequence. To enable the internal temperature sensor, select DB7/TSENSE. Figure 6. Alert Limits Setup The AD7291 signals an alert in hardware if the conversion result moves outside the upper or lower limit set by the limit registers. ALERTA and ALERTB indicators on the main window turn red if a limit is violated, as shown in Figure 7. Alert Register A stores alerts for the analog voltage conversion channels, and Alert Register B stores alerts for the internal temperature sensor. For further information on the status of the alerts, click READ ALERT STATUS on the front panel. For example, Figure 8 depicts an example where the VIN0 low limit, TSENSE AVG high limit, and TSENSE high limit have been violated. SAMPLE ADC/CONTINUOUSLY SAMPLE To gather sample data on the selected channels, click SAMPLE ADC or CONTINUOUSLY SAMPLE. Both buttons are located on the upper middle area of the main window. To stop sampling, click CONTINOUSLY SAMPLE a second time. Rev. A | Page 7 of 16 Evaluation Board User Guide 09710-007 UG-253 09710-008 Figure 7. AD7291 Main Window Showing Triggered ALERT A and ALERT B Indicators Figure 8. Read Alert Status Rev. A | Page 8 of 16 Evaluation Board User Guide UG-253 EVALUATION BOARD SCHEMATICS AND ARTWORK 09710-009 Figure 9. EVAL-AD7291SDZ Schematic 1 of 3 Rev. A | Page 9 of 16 UG-253 Evaluation Board User Guide 09710-010 Figure 10. EVAL-AD7291SDZ Schematic 2 of 3 Rev. A | Page 10 of 16 Evaluation Board User Guide UG-253 09710-011 Figure 11. EVAL-AD7291SDZ Schematic 3 of 3 Rev. A | Page 11 of 16 Evaluation Board User Guide 09710-012 UG-253 09710-013 Figure 12. Component Side Artwork 09710-014 Figure 12. Solder Side Artwork Figure 13. Component Side Silkscreen Rev. A | Page 12 of 16 Evaluation Board User Guide UG-253 ORDERING INFORMATION BILL OF MATERIALS Table 3. Reference Designator C1, C11, C21, C31 Part Type Capacitor Value 1 nF Tolerance 0.1 C2, C12, C22, C30, C32, C34, C72, C77,C82, C 85, C3, C5, C7, C10, C13, C20, C23, C24, C25, C33 C4 Capacitor 10 pF 0.05 Not inserted N/A N/A Capacitor 10 µF C6, C8, C15, C36, C44, C45,C47, C48, C74, C76 C9, C16 Capacitor 100 nF Capacitor C14, C26 Part Number U0603R102KCT Stock Code FEC 9406174 06035A100JAT2A FEC 499110 0603 capacitor spacing N/A N/A 0.2 6.3 V X5R ceramic capacitor C0603C106M9PACTU FEC 1288201 0.05 16 V X7R ceramic capacitor 0603YC104JAT2A FEC 432210 4.7 µF 0.1 C0603C475K8PAC 7867 FEC 1572625 Capacitor 10 µF 0.1 10 V X7R multilayer ceramic capacitor 603 10 V SMD tantalum capacitor TAJA106K010R FEC 197130 C17 Capacitor 47 µF 0.2 SMD tantalum capacitor TAKA106010R FEC 1658411 C18, C19, C71, C78, C81, C83 C27, C29, C70, C79, C80, C84 C28 Capacitor 0.1 µF 0.1 B0603R104KCT FEC 9406140 Capacitor 10 µF 0.2 ECJ-HVB1C106M Capacitor 10 nF 0.1 06035C103KAZ2A Digi-Key PCC2417CT-ND FEC 7569548 C35, C38, C40, C41,C43,C73,C75 J1 Capacitor 10 µF 0.1 16 V X7R multilayer ceramic capacitor 16 V X5R multilayer ceramic capacitor 1206 50 V NPO multilayer ceramic capacitor 16 V SMD tantalum capacitor AVX TAJB106K016R FEC 498737 FX8-120S-SV(21) FEC 1324660 CTB5000/3 FEC 151790 1-1337482-0 FEC 1206013 CTB5000/2 FEC 151789 M20-9990206 J3 to J6,J8 to J13, BUFF_V0, BUFF_V7 J15, J16 SMB LK1 to LK4, LK8 TO LK14 LK5 Jumper LK6, LK7 Jumper LK20 Jumper R1, R11, R21, R31 Resistor 500 Ω 0.01 120-way connector, 0.6 mm pitch 3-pin terminal block, 5 mm pitch 50 W gold plated PCB SMB jack 2-pin terminal block, 5 mm pitch 2-pin header and shorting shunt 8-pin (4x2) header and shorting shunt 4-pin (2x2) header and shorting shunt 6-pin (3x2) header and shorting shunt 0603 SMD resistor MC0.063W06031%499R FEC 1022247 and 150411 FEC 1022231 & 150411 FEC 1022233 & 150411 FEC 1022244 % 150411 FEC 1170758 R2, R12, R20, R22, R32, R50, R54, R61, R62, R63, R64, R65 R3, R13, R23, R26 to R29, R30, R33, R37, R38, R39, R40, R41, R42, R55, R56, R58, R59 R4, R14, R24, R34, R43, R51, R52, R53 Resistor 10 kΩ 0.01 0603 SMD resistor MC0.063W06031%10K FEC 9330399 Not inserted N/A N/A 0603 resistor space N/A N/A Resistor 1 kΩ 0.01 0603 SMD resistor MC0.063W06031%1K FEC 9330380 J2 CON-120/ FX8-120S-SV CON/POWER3 Part Description 50 V X7R multilayer ceramic capacitor 50 V NPO multilayer ceramic capacitor CON/POWER Jumper Rev. A | Page 13 of 16 M20-9990206 M20-9990206 M20-9983646 UG-253 Reference Designator R5 to R10, R15 to R19, R25, R35, R36, R46, R49, R57, R60 R44 Evaluation Board User Guide Part Type Resistor Value 0Ω Tolerance 0.01 Part Description 0603 SMD resistor Part Number MC0.063W06030R Stock Code FEC 9331662 Resistor 2k 0.01 0603 SMD resistor MC0.063W06031%2K FEC 9330763 R45, R47, R48 Resistor 500 Ω 0.001 0805 SMD resistor CRCW0805499RFKEA FEC 1152405 SL1 to SL4 Solder link two-way solder bridge N/A N/A U1 AD7291 Main device AD7291BCPZ AD7291BCPZ U2 AD8022 Dual op amp AD8022ARZ AD8022ARZ U3 AD8066 Dual op amp AD8066ARZ AD8066ARZ U4 EEPROM 32 kΩ I C serial EEPROM 24LC32A-1/MS FEC 1331330 U5 ADP1706 Linear regulator ADP1706ACPZ-3.3V-R7 U8, U9, U10 AD8021 Op amp AD8021ARZ ADP1706ACPZ3.3V-R7 AD8021ARZ T_SCLK, PD, T_CS, T_DIN, T_TENSE_B, TDOUT, VCC, VDRIVE BIASED_VIN2, EXT_OFFSET, VIN, VREF_BUFF Test point Black test point 20-2137 FEC 8731128 SMB 50Ω SMB jack SMB1251B1-3GT30G-50 FEC 1111349 2 Rev. A | Page 14 of 16 Evaluation Board User Guide UG-253 NOTES Rev. A | Page 15 of 16 UG-253 Evaluation Board User Guide NOTES I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). 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 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG09710-0-6/11(A) Rev. A | Page 16 of 16