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Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 32

FEATURES

Full featured evaluation board for the AD7903 Versatile analog signal conditioning circuitry On-board reference, reference buffers, and ADC drivers System demonstration board compatible (EVAL-SDP-CB1Z) PC software for control and data analysis of time and frequency domain EVALUATION KIT CONTENTS EVAL-AD7903SDZ evaluation board Wall power supply 9 V dc adapter Daughter card power connector ADDITIONAL EQUIPMENT/SOFTWARE NEEDED System demonstration platform (EVAL-SDP-CB1Z) Precision analog signal source Power supply, +7 V/−2.5 V (optional) USB cable SMA cable PC running Windows XP SP2, Windows Vista, Windows 7, or higher with USB 2.0 port Evaluation software for the AD7903 (download from AD7903 product page) ONLINE RESOURCES Documents Needed AD7903 data sheet EVAL-AD7903SDZ user guide Required Software EVAL-AD7903SDZ evaluation software FAQs and Troubleshooting TYPICAL SETUP Figure 1. Typical Setup for the EVAL-AD7903SDZ

UG-609 EVAL-AD7903SDZ User Guide Rev. 0 | Page 2 of 32 TABLE OF CONTENTS Setting Up the System for Data Capture: Generating a Summary of the Waveform, Histogram, and

REVISION HISTORY

1/14—Revision 0: Initial Version

EVAL-AD7903SDZ User Guide UG-609 Rev. 0 | Page 3 of 32 GENERAL DESCRIPTION The E VA L-AD7903SDZ is an evaluation board designed to demonstrate the low power AD7903 performance and to provide an easy to understand interface for a variety of system applications. The AD7903 is a dual differential 16-bit, 1 MSPS PulSAR® ADC. A full description of the AD7903 is available in the AD7903 data sheet and should be consulted when using this evaluation board. The evaluation board is ideal for use with the Analog Devices, Inc., system demonstration platform (SDP) board, E VA L-SDP-CB1Z. The evaluation board interfaces to the SDP board via a 120-pin connector. SMA Connectors J6, J7, J10, and J15 are provided to connect a low noise analog signal source. The user PC software executable controls the evaluation board over the USB through the SDP board, E VA L-SDP-CB1Z. On-board components include the following: ADR435: high precision, buffered band gap 5.0 V reference AD8031: reference buffer ADA4841-1: signal conditioning circuit with op amps ADP7104 and ADP2301: regulators to derive necessary voltage levels on board

specified for use with a single supply of 2.5 V (VDD1, VDD2). Devices website, at www.analog.com. Figure 26 to Figure 31 show the evaluation board schematics. supplies described in Table 1. Table 1. Power Supplies Provided on the Board and the on-board power supplies are no longer required. Table 2. Solder Links—Settings for Bench Top Power Supply 1 All other solder link settings are as described in Table 3.

Figure 16. Simplified Evaluation Board Functional Block Diagram

evaluation board can be used in standalone mode. mode may damage the SDP board. Table 3. Solder Links—Factory Default Settings SL1 A +VS Change to B if using bench supplies. SL2 A −VS Change to B if using bench supplies. SL3 A −VS Change to B if using bench supplies. SL4 A +VS Change to B if using bench supplies. SL5 A Analog input Do not alter. SL6 A Analog input Do not alter. LK3 A V_SDP Change to B if using bench supplies. LK4 A VREF Change to B if using bench supplies. LK5 A VDD for ADC Change to B if using bench supplies. Change to B if U14 inverting input needs to be connected to ground. Change to B if U16 inverting input needs to be connected to ground. LK8 A ADC2 input Change to B if using ADC1 input. LK9 A ADC2 input Change to B if using ADC1 input. LK10 A U17 input Change to B if U17 needs to be bypassed. LK11 A U17 input Change to B if U17 needs to be bypassed. LK12 A U16 input Change to B if U16 needs to be bypassed.

Figure 27. The circuit not only allows different configurations, input amplifiers are set as unity-gain buffers by factory default. a differential analog input path to ADC1 and ADC2 (see Figure 16). a very low distortion ac source. gate the SPORT transfer to the ADC device.

UG-609 EVAL-AD7903SDZ User Guide Rev. 0 | Page 12 of 32 MODES OF OPERATION SDP CONTROLLED MODE The AD7903 uses a high speed serial interface that allows sampling rates of up to 1 MSPS. For more information about the operation of the serial interface, refer to the AD7903 data sheet. The AD7903 uses the serial interface to transfer data to the E VA L-SDP-CB1Z. The E VA L-AD7903SDZ communicates with the E VA L-SDP-CB1Z board using level shifters. The EVA L-SDP-CB1Z operates at a 3.3 V logic level, which allows logic voltages that exceed 3.3 V to be used without damaging the SDP interface. STANDALONE MODE The E VA L-AD7903SDZ can also be used without the E VA L-SDP- CB1Z controller board. In this case, the E VA L-AD7903SDZ is connected to the serial interface using the J5 connector or the test points. For more information about the operation of the serial interface, refer to the AD7903 data sheet.

EVAL-AD7903SDZ User Guide UG-609 Rev. 0 | Page 15 of 32 OVERVIEW OF THE MAIN WINDOW The main window of the software is shown in Figure 21 and has the features described in this section. File Menu The File menu offers the choice to

• Load data: load previously captured data.
• Save Data as .tsv: save captured data in .tsv format for future analysis.
• Save Picture: save the current screen capture.
• Print: print the main window to the default printer.
• Exit: close the application. Eval Board Connected Box The Eval Board Connected box displays the evaluation board connected to the USB port—either E VA L-AD7902SDZ or E VA L-AD7903SDZ. When an evaluation board is not connected to the USB port, the software can be operated in standalone mode for data analysis, and the part information notes the part number from the saved data file. ADC Settings Area The ADC Settings section allows changing the sampling frequency and the reference voltage value, as well as selecting Channel 1 or Channel 2. Reference Voltage (V) Box By default, the external reference voltage is 5 V (ADR435 on-board reference). The minimum/maximum voltage calculations are based on this reference voltage. If you change the reference voltage, you must change this input accordingly. Sampling Freq (Hz) Box The default sampling frequency (10000000 Hz) in the Sampling Freq (Hz) box matches the maximum sample rate of the ADC connected to the board. Although you can adjust the sampling frequency, there are limitations in terms of the sample frequencies that can be entered related to the SCLK frequency applied. The sample frequency must be an integer divider of the SCLK frequency. If an unusable sample frequency is input, the software automatically adjusts the sample frequency accordingly. Units can be entered as, for example, 10k for 10,000 Hz. The software automatically adjusts the sample frequency according to the ability of the ADC connected to the board. For example, if you enter a value that is beyond the ability of the device, the software indicates this and reverts to the maximum sample frequency. Select Channels Checkboxes Select either Channel 1 or Channel 2 or both to read the data from a single ADC or both ADCs simultaneously. Tabs Area There are five tabs available in the tabs area of the main window: Configure, Waveform, Histogram, FFT, and Summary. These tabs display the data in different formats. Navigation tools are provided within each tab to allow you to control the cursor, zooming, and panning (see Figure 22) within the graphs displayed. Each tab is described in more detail in the Generating a Waveform Analysis Report; Generating a Histogram of the ADC Code Distribution; Generating a Fast Fourier Transform of AC Characteristics; and Generating a Summary of the Waveform, Histogram, and Fast Fourier Transform sections. Single Capture Button Clicking Single Capture performs a single capture from the ADC. Continuous Capture Button Clicking Continuous Capture performs a continuous capture from the ADC. Num Samples Box The Num Samples box allows you to select the number of samples to analyze. Exit Button Clicking the Exit button (in the upper right corner of the window) closes the software. Alternatively, you can select Exit from the File menu.

Figure 28. Schematic, Page 3

Figure 29. Schematic, Page 4

Figure 30. Schematic, Page 5

Figure 31. Schematic, Page 6

• Decouple all the power supply pins (VDD1, VDD2, and VIO) and the REF pin with low ESR and low ESL ceramic capacitors, typically 10 µF and 100 nF , placed close to the DUT (U1) and connected using short, wide traces to provide low impedance paths and to reduce the effect of glitches on the power supply lines.
• Separate analog and digital sections and keep power supply circuitry away from the AD7903.
• Avoid running digital lines under the device and crossover of digital and analog signals because these couple noise into the AD7903.

Figure 32. EVAL-AD7903SDZ Evaluation Board Silkscreen—Top Assembly

Table 4. EVAL-AD7903SDZ Bill of Materials

EVAL-AD7903SDZ User Guide UG-609 Rev. 0 | Page 29 of 32 Reference Designator Part Description Manufacturer Part Number Stock Code C24, C29, C32, C36, C38, C39, C43, C46, C47, C49, C55, C60, C61, C62, C63, C68, C69, C70, C71, C72, C73, C76, C81 Capacitor ceramic, 50 V, C0G/NP0, 0603 TDK C1608C0G1H272J Do not place R1 Resistor, thick film, 2.4 kΩ, 0603, 100 mW, 1% Yageo RC0603FR-072K4L Farnell 1799329 R2 SMD resistor Multicomp MC 0.1W 0805 1% 62K Farnell 9333436 R3 Resistor, 0603, 35.7 kΩ Multicomp MC 0.063W 0603 1% 35K7 Farnell 1170942 R4 SMD resistor Multicomp MC 0.0625W 0402 1% 53K6 Farnell 1803723 R5 SMD resistor Multicomp MC 0.0625W 0402 1% 10K2 Farnell 1803137 R6 Resistor, 0603, 16.9 kΩ Multicomp MC 0.063W 0603 1% 16K9 Farnell 1170908 R7 Resistor, 0805, 12.1 kΩ, 1% Vishay Draloric CRCW080512K1FKEA Farnell 1469866 R10 Resistor, 0603, 82 kΩ, 0.063 W, 1% Multicomp MC 0.063W 0603 1% 82K Farnell 9331573 R11, R13, R42, R44 SMD resistor Multicomp MC 0.063W 0603 1% 100K Farnell 9330402 R12, R14, R20, R21, R23, R25, R26, R36, R38, R40, R45, R48, R53, R56, R63, R64, R69, R70, R71, R72 SMD resistor Multicomp MC 0.063W 0603 0R Farnell 9331662 R17, R22, R32, R37, R46, R47, R54, R55 Resistor, 0805, 49.9 Ω, 0.1%, 0.125 W Panasonic ERA6AEB49R9V Farnell 1810805 R27, R28, R34, R35, R49, R50, R73, R74 Resistor, 0805, 49.9 kΩ, 1%, 0.125 W Panasonic ERJ-6ENF4992V Digi-Key P49.9KCCT-ND R24, R41, R67, R68 Resistor, 22 Ω, 1% 0805 Vishay Draloric CRCW080522ROFKEAHP Farnell 1738936 R8, R9, R15, R16, R18, R19, R29, R30, R31, R33, R39, R44, R59, R60, R61, R62, R65, R66 Not applicable Not applicable Not applicable Do not place

UG-609 EVAL-AD7903SDZ User Guide Rev. 0 | Page 30 of 32 RELATED LINKS Resource Description AD7903 Product Page: Dual Differential 16-Bit, 1 MSPS PulSAR ADC ADA4841-1 Product Page: Unity Gain Stable, Low Noise and Distortion, Rail-to-Rail Output Amplifier AD8031 Product Page: 2.7 V, 800 μA, 80 MHz Rail-to-Rail I/O Amplifiers ADP7104 Product Page : 20 V, 300 mA/500 mA, Low Noise, CMOS LDO ADP2301 Product Page: 1.2 A, 20 V, 1.4 MHz, Nonsynchronous Step-Down Regulator ADR435 Product Page: Ultralow Noise, High Accuracy Voltage References

EVAL-AD7903SDZ User Guide UG-609 Rev. 0 | Page 31 of 32 NOTES

UG-609 EVAL-AD7903SDZ User Guide Rev. 0 | Page 32 of 32 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 t o C u s t o m e r . C u s t o m e r a g r e e s t o r e t u r n t o A D I t h e E v a l u a t i o n B o a r d a t t h a t t i m e . L I M I T A T I O N O F L I A B I L I T Y . T H E E V A L U A T I O N B O A R D 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. ©2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the prop erty of their respective owners. UG11800-0-1/14(0)