EVAL-AD9838SDZ

Evaluation Board User Guide UG-268 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 Evaluating the AD9838 11 mW Power, 2.3 V to 5.5 V, 16 MHz Complete DDS FEATURES GENERAL DESCRIPTION Full featured evaluation board for the AD9838 Graphical user interface software for board control and data analysis Connector to EVAL-SDP-CB1Z system demonstration platform (SDP) board Various power supply and reference link options The AD9838 is a 16 MHz low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows a square wave to be produced for clock generation. Consuming only 20 mW of power at 3 V makes the AD9838 an ideal candidate for powersensitive applications. APPLICATIONS The EVAL-AD9838SDZ board is used in conjunction with an EVAL-SDP-CB1Z SDP board, available from Analog Devices, Inc. The USB-to-SPI communication to the AD9838 is completed using this Blackfin®-based development board. Biomedical sensors Bioelectrical impedance analysis Electrochemical analysis Impedance spectroscopy Complex impedance measurement Nondestructive testing A high performance, on-board 16 MHz trimmed general oscillator is available to use as the master clock for the AD9838 system. Various links and SMB connectors are also available on the EVAL-AD9838SDZ board to maximize usability. Complete specifications for the AD9838 are provided in the AD9838 data sheet, available from Analog Devices, and should be consulted in conjunction with this user guide when using the evaluation board. FUNCTIONAL BLOCK DIAGRAM EVAL-SDP-CB1Z MCLK XO REF196 MCLK PSELECT GPIO FSELECT IOUT AD9838 IOUTB RESET FSYNC SCLK SDATA USB 09805-001 SPORT Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. B | Page 1 of 12 UG-268 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Programming Method: Hardware or Software .........................6 Applications ....................................................................................... 1 Loading Frequency and Phase Registers ....................................6 General Description ......................................................................... 1 FSK and PSK Functionality..........................................................6 Functional Block Diagram .............................................................. 1 Waveform Options ........................................................................6 Revision History ............................................................................... 2 Hardware Options .........................................................................7 Evaluation Board Software .............................................................. 3 Reset and Sweep ............................................................................7 Installing the Software ................................................................. 3 Example of Operation ...................................................................8 Running the Software .................................................................. 4 Evaluation Board Schematics and Layout ......................................9 Using the Evaluation Board Software ............................................ 5 Ordering Information .................................................................... 11 Setting Up the Digital Interface .................................................. 5 Bill of Materials ........................................................................... 11 Select External MCLK Frequency .............................................. 6 REVISION HISTORY 3/13—Rev. A to Rev. B Changed 75 MHz to 16 MHz, Title ................................................ 1 Changes to Setting Up the Digital Interface Section ................... 5 Changes to Select External MCLK Frequency Section, Programming Method: Hardware or Software Section, and Loading Frequency and Phase Registers Section ............. 6 Changes to Example of Operation Section ................................... 8 Changes to Figure 16 ........................................................................ 9 8/12—Rev. 0 to Rev. A Changed LK3 Position from In to Out, Table 1 ............................ 4 4/11—Revision 0: Initial Version Rev. B | Page 2 of 12 Evaluation Board User Guide UG-268 EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE The EVAL-AD9838SDZ evaluation kit includes the software and drivers on a CD. The software is compatible with Windows® XP, Windows Vista, and Windows 7. To install the software, follow these steps: 2. 3. Install the software before connecting the SDP board to the USB port of the PC. Start the Windows operating system and insert the EVAL-AD9838SDZ evaluation kit CD. Download the AD9838SDZ LabVIEW® software. The correct driver, SDPDriversNET, for the SDP board should download automatically after LabVIEW is downloaded, 5. 09805-002 1. 4. supporting both 32- and 64-bit systems. However, if the drivers do not download automatically, the driver executable file can also be found in the Program Files/Analog Devices folder. Follow the on-screen prompts to install the SDPDriverNet Version 1.3.6.0. After installation of the software and drivers is complete, plug the EVAL-AD9838SDZ into the SDP board and the SDP board into the PC using the USB cable included in the box. When the software detects the evaluation board, proceed through any dialog boxes that appear to finalize the installation (Found New Hardware Wizard/Install the Software Automatically and so on). Figure 2. Hardware Device Manager Window with SDP Board Plugged In Rev. B | Page 3 of 12 UG-268 Evaluation Board User Guide RUNNING THE SOFTWARE Table 1. Default Setup for Link Positions To run the evaluation board program, do the following: Link No. LK1 Position A LK2 B LK3 Out LK4 B 2. 3. Click Start/All Programs/Analog Devices/AD9838/ AD9838 Eval Board. If the SDP board is not connected to the USB port when the software is launched, a connectivity error displays (see Figure 3). Simply connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions. Ensure that all links are in the correct positions (see Table 1). The main window of the AD9838DBZ evaluation software then opens, as shown in Figure 4. 09805-003 1. Function On-board linear regulator selected to supply power to the general oscillator. 3.3 V digital supply for the AD9838 supplied from the EVAL-SDP-CB1Z board. Decouple the CAP/2.5V pin to ground because VDD is >2.7 V. 3.3 V analog supply for the AD9838 supplied from the EVAL-SDP-CB1Z board. Figure 3. Pop-Up Window Error Rev. B | Page 4 of 12 Evaluation Board User Guide UG-268 09805-004 USING THE EVALUATION BOARD SOFTWARE Figure 4. AD9838 DDS Evaluation Software SETTING UP THE DIGITAL INTERFACE To set up the AD9838 to perform measurements, first plug the EVAL-SDP-CB1Z board into the EVAL-AD9838SDZ board and connect the system to the USB port of a PC. Then launch the evaluation software and set the DIGITAL INTERFACE. The EVAL-SDP-CB1Z has two connector plugs: connectorA and connectorB. Select which connector you want to use with the AD9838 evaluation board from the Connector drop-down menu. 09805-005 The SPI Frame Frequency and SCLK Frequency boxes can also be set in this window. If the SPI interface speed has not been decided upon, leave the default values shown in Figure 5. Figure 5. Digital Interface Rev. B | Page 5 of 12 UG-268 Evaluation Board User Guide SELECT EXTERNAL MCLK FREQUENCY The analog output frequency from the AD9838 is defined by Having selected the digital interface specifics, next use the EXTERNAL MCLK box to choose which frequency to use. The boards are supplied with a 16 MHz general oscillator. If a different clock source is required, the CLK1 SMB connector can be used to supply a different MCLK value. where FREQREG is the value loaded into the selected frequency register in decimals. This signal is phase shifted by 2π/4096 × PHASEREG where PHASEREG is the value contained in the selected phase register in decimals. 09805-006 Two options for the general oscillator include the AEL3013 oscillators from AEL Crystals and the SG-310SCN oscillators from Epson Electronics. fMCLK/228 × FREQREG Figure 6. EXTERNAL MCLK Input 09805-008 PROGRAMMING METHOD: HARDWARE OR SOFTWARE Figure 8. Frequency and Phase Load FSK AND PSK FUNCTIONALITY In software mode, the AD9838 can be set up for FSK or PSK functionality by simply entering the bit rate in milliseconds and clicking FSK or PSK (see Figure 9). 09805-009 Functions that select frequency and phase registers, reset internal registers, and power down the DAC can be implemented using either software or hardware. Figure 7 shows how to select the source of control for these functions. Alternatively, you can set the PIN/SW bit to 1 to select that these functions be controlled using the appropriate hardware control pins, or you can set the PIN/SW bit to 0 to select that these functions be controlled using the appropriate software control bits. Figure 9. FSK and PSK Functionality WAVEFORM OPTIONS 09805-007 The output waveform can be selected as a sinusoidal waveform or a ramp waveform. The internal comparator in the AD9838 can be disabled or enabled (see Figure 10). The MSB or the MSB/2 of the phase accumulator can be selected as the output on the SIGN BIT OUT pin. Figure 7. Programming Method The desired output frequency and output phase can be loaded using the inputs shown in Figure 8. Either the FREQ0 register or the FREQ1 register can be loaded with frequency data. The frequency data is loaded in megahertz, and the equivalent hexadecimal code is shown to the right after data is entered; press the ENTER key to load data. After data is loaded, the output appears on the IOUT and IOUTB pins. Similarly, either the PHASE0 register or PHASE1 register can be selected, and the phase data is loaded in degrees. Rev. B | Page 6 of 12 09805-010 LOADING FREQUENCY AND PHASE REGISTERS Figure 10. Waveform Profile and SIGN BIT OUT Pin Evaluation Board User Guide UG-268 RESET AND SWEEP The AD9838 has various power-down options selected through the control register. The part can disable the MCLK or disable the DAC if just the MSB output is used on the SIGN BIT OUT pin, or it can power down both sections for a lower power sleep mode (see Figure 11). The reset software command is set using the buttons shown in Figure 13. To set up a DDS sweep, click Sweep. 09805-013 Power-Down Options Figure 13. Software Reset and Sweep Select 09805-011 The sweep function allows users to load a start frequency, stop frequency, increment size, number of loops, and delay between each frequency increment. These commands are then loaded to the part automatically from the EVAL-SDP-CB1Z board. Figure 11. Power-Down Options HARDWARE OPTIONS 09805-014 If the hardware programming method is selected as shown in Figure 7, the following pin functions can be toggled: FSELECT, PSELECT, RESET, and SLEEP (by clicking FSEL, PSEL, Reset, and SLEEP, respectively; see Figure 12). These functions are controlled by the GPIO outputs on the EVAL-SDP-CB1Z board. For example, frequency data can be loaded to the FREQ0 register and the FREQ1 register, and the output can be toggled by the FSELECT pin, that is, 2FSK functionality. 09805-012 Figure 14. Sweep Functionality Figure 12. GPIO Hardware Pin Control Rev. B | Page 7 of 12 UG-268 Evaluation Board User Guide EXAMPLE OF OPERATION An example of configuring the AD9838 to output 10 kHz follows: 2. 3. 4. 5. 6. 7. Plug the EVAL-SDP-CB1Z board into the EVAL-AD9838SDZ board and connect to the USB port. Start up the software located at Start/All Programs/ Analog Devices/AD9838/AD9838 Eval Board. You should see the SDP board communicating with the PC. Select connectorA or connectorB; this must match what the AD9838 test chip is connected to. Define MCLK; the default is an on-board 16 MHz oscillator. Ensure that all links are in the correct positions (see Table 1). Select the FREQ1 register. Load a 10 kHz excitation frequency and press ENTER. For the FREQ0 register, follow the steps in the example operation, but with the following exceptions: • • In Step 6, select the FREQ0 register. In Step 7, load the FREQ0 register with 20 kHz and press ENTER. CH1 FREQ 10kHz CH1 p-p 596mV 1 CH1 100mV M20µs T 0s A CH1 182mV Figure 15. 10 kHz Output Signals on an IOUT Test Point Rev. B | Page 8 of 12 09805-015 1. The output should appear on the IOUT and IOUTB outputs on the evaluation board. Evaluation Board User Guide UG-268 09805-016 EVALUATION BOARD SCHEMATICS AND LAYOUT 09805-017 Figure 16. AD9838 Schematic Part A Figure 17. AD9838 Schematic Part B Rev. B | Page 9 of 12 Evaluation Board User Guide 09805-018 UG-268 Figure 18. Component Side View Layer 1 Rev. B | Page 10 of 12 Evaluation Board User Guide UG-268 ORDERING INFORMATION BILL OF MATERIALS Table 2. Reference Designator C1, C2, C4 to C6, C8, C11, C12, C14, C15 C3 C7, C9 C13, C16 C17, C19 C18 CLK1, 1 F SEL1,1 IOUT, IOUTB, PSEL1,1 SBOUT, SLEEP FSYNC, IOUT_, IOUT_B, REF, RESET, SBOUT_, SCLK, SDATA G1 J1 J2, J3 LK1, LK2, LK4 LK3 R1,1 R2,1 R81 R31 R4 R5, R6 R7 R9, R10,1 R11, R12,1 R13,1 R14, R15,1 R16, R17 U1 U2 U3 X1, X2 Y1 1 Description 0.1 µF ceramic capacitor, 50 V, X7R, ±10%, 0603 Manufacturer Murata Part Number GRM188R71H104KA93D 0.01 µF capacitor, 0603, 10 V, X5R, 10% 10 µF tantalum capacitor, ±10%, 10 V, SMD, RTAJ_A 1 µF capacitor, 10 V, Y5V, 0603, +80%, −20% 0.1 µF capacitor, 0603, 16 V, X7R, ±10% 10 µF ceramic capacitor, 10 V, 10%, X5R, 0805 Straight PCB mount SMB jack, 50 Ω Kemet AVX Yageo Multicomp Murata Tyco C0603C103K5RACTU TAJA106K010R CC0603ZRY5V6BB105 B0603R104KCT GRM21BR61A106KE19L 1-1337482-0 Red test point Vero 20-313137 Ground link, copper short 120-way connector, 0.6 mm pitch, receptacle 2-pin terminal block (5 mm pitch) 3-pin SIL header and shorting link Not applicable HRS (Hirose) Campden Harwin 2-pin SIL header and shorting link, SIP-2P 10 kΩ SMD resistor, 0603 50 Ω SMD resistor, 0603 6.8 kΩ SMD resistor, 0603 200 Ω SMD resistor, 0603 300 Ω SMD resistor, 0603 0 Ω, 0603, SMD resistor Harwin Multicomp Multicomp Multicomp Multicomp Multicomp Multicomp Not applicable FX8-120S-SV(21) CTB5000/2 M20-9990345 and M7567-05 M20-9990246 MC 0.063W 0603 10K MC 0.063W 0603 50r MC 0.063W 0603 6K8 MC 0.063W 0603 200R MC 0.063W 0603 300R MC 0.063W 0603 0R 11 mW power, 2.3 V to 5.5 V, 16 MHz complete DDS, 20-lead LFCSP 64k I2C serial EEPROM, MSOP-8 Precision micropower, low dropout, low voltage references, 8-lead TSSOP 3 mm NPTH hole 16 MHz, 3 mm × 2 mm SMD clock oscillator Analog Devices AD9838BCPZ Microchip Analog Devices 24LC64-I/MS REF196GRUZ Not applicable Epson MTHOLE-3mm SG-310 Series Do not install. Rev. B | Page 11 of 12 UG-268 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. 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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. UG09805-0-3/13(B) Rev. B | Page 12 of 12