EVAL-AD5415SDZ

Evaluation Board User Guide UG-296 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 AD5415 Serial Input, Dual-Channel Current Output DAC FEATURES 5.5 V power supply, making it suited to battery-powered and other applications. Full-featured evaluation board for the AD5415 Graphic user interface software for board control and data analysis Connector to EVAL-SDP-CB1Z system demonstration platform board Various power supply options As a result of being manufactured on a CMOS submicron process, this part offers excellent four-quadrant multiplication characteristics, with large signal multiplying bandwidths of 10 MHz. The applied external reference input voltage (VREFx) determines the full-scale output current. An integrated feedback resistor (RFBx) provides temperature tracking and full-scale voltage output when combined with an external current-to-voltage precision amplifier. In addition, this device contains the fourquadrant resistors necessary for bipolar operation and other configuration modes. APPLICATIONS Portable battery-powered applications Waveform generators Analog processing Instrumentation applications Programmable amplifiers and attenuators Digitally controlled calibration Programmable filters and oscillators Composite video Ultrasound Gain, offset, and voltage trimming This DAC uses a double-buffered, 3-wire serial interface that is compatible with SPI, QSPI™, MICROWIRE®, and most DSP interface standards. In addition, a serial data out pin (SDO) allows daisy-chaining when multiple packages are used. Data readback allows the user to read the contents of the DAC register via the SDO pin. On power-up, the internal shift register and latches are filled with 0s, and the DAC outputs are at zero scale. The AD5415 DAC is available in a 24-lead TSSOP package. GENERAL DESCRIPTION The AD5415 is a CMOS, 12-bit, dual-channel, current output digital-to-analog converter. This device operates from a 2.5 V to The evaluation board, EV-AD5415/49SDZ, is available for evaluating the performance of the AD5415 DAC. EVALUATION BOARD FUNCTIONAL BLOCK DIAGRAM VREF A VREF B ADR01 REFERENCE AD8065 DAC A SDO LDAC CLR I TO V VOUTA AD5449 CONNECTOR TO SDP-1Z 12-BIT DAC DAC B AD8065 DAC A AD8065 I TO V I TO V VOUTB VOUTA AD5415 12-BIT DAC AD8065 DAC B I TO V EV-AD5415/49SDZ VDD1 VDD AGND VSS Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. C | Page 1 of 12 VOUTB 09973-001 SYNC SDIN SCLK UG-296 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Software ...............................................................4 Applications ....................................................................................... 1 Installing the Software ..................................................................4 General Description ......................................................................... 1 Running the Software ...................................................................4 Evaluation Board Functional Block Diagram ............................... 1 Using the Evaluation Board Software .............................................5 Revision History ............................................................................... 2 Evaluation Board Functions and Registers ................................5 Evaluation Board .............................................................................. 3 Evaluation Board Schematics and Artwork ...................................8 System Demonstration Platform ................................................ 3 Schematics ......................................................................................8 EVAL-AD5415/AD5449SDZ to SPORT Interface ................... 3 Evaluation Board Layout ........................................................... 10 Operating the Evaluation Board ................................................. 3 Related Links ............................................................................... 11 Serial Interface .............................................................................. 3 Microprocessor Interfacing ......................................................... 3 REVISION HISTORY 5/13—Rev. B to Rev. C Changed EVAL-AD5415SDZ to EV-AD5415/49SDZ ............................................................................................... Universal 6/11—Rev. 0 to Rev. A Document Title, Format, and Content Changed from EVAL-AD5415E, Revision 0, to UG-296, Rev. A ........... Universal 3/12—Rev. A to Rev. B Changed EVAL-AD5415/AD5449SDZ to EVAL-AD5415SDZ Throughout ....................................................................................... 1 Change to Figure 1 ........................................................................... 1 Changed ADSP-BF5xx to ADSP-BF527 Throughout.................. 3 Change to Figure 2 ........................................................................... 3 Changes to Figure 3 and Installing the Software Section ............ 4 Changes to Using the Evaluation Board Software Section.......... 5 Changes to Evaluation Board Schematics and Artwork Section ................................................................................................ 8 3/10—Revision 0: Initial Version Rev. C | Page 2 of 12 Evaluation Board User Guide UG-296 EVALUATION BOARD The EV-AD5415/49SDZ board consists of an AD5449 DAC, an AD5415 DAC, and AD8065 current-to-voltage amplifiers. Included on the evaluation board is a 10 V reference, the ADR01. An external reference can also be applied via an SMB input. The evaluation kit consists of a CD-ROM with selfinstalling PC software to control the DAC. The software allows the user to write a code to the device. The EV-AD5415/49SDZ board is used in conjunction with the EVAL-SDP-CB1Z system demonstration platform (SDP) board available from Analog Devices, Inc., which is purchased separately from the evaluation board. The USB-to-SPI communication to the AD5415 is completed using this Blackfin®-based demonstration board. The software offers a waveform generator. SYSTEM DEMONSTRATION PLATFORM The SDP is a hardware and software evaluation tool for use in conjunction with product evaluation boards. The SDP board is based on the Blackfin ADSP-BF527 processor with USB connectivity to the PC through a USB 2.0 high speed port. For more information about this device, see the system demonstration platform web page at www.analog.com/EVALSDP-CB1Z. SERIAL INTERFACE The AD5415 has an interface that is compatible with SPI, QSPI, MICROWIRE, and most DSP interface standards. Data is written to the device in 16-bit words. Each 16-bit word consists of four control bits and 12 data bits for the AD5415. Control bits allow control of various functions on the DAC. MICROPROCESSOR INTERFACING Microprocessor interfacing to the AD5415 DAC is through a serial bus that uses a standard protocol compatible with microcontrollers and DSP processors. The SDP is a hardware and software platform that provides a means to communicate from the PC to Analog Devices products and systems that require digital control and/or readback. The SDP has a Blackfin processor (ADSP-BF527) at its core. The ADSP-BF527 processor incorporates channel synchronous serial ports (SPORT) and general-purpose input/output (GPIO) pins. A serial interface between the Blackfin processor and the AD5415 DAC is shown in Figure 2. For more details about the system demonstration platform, see the EVAL-SDP-CB1Z at www.analog.com/EVAL-SDP-CB1Z. AD5415 ADSP-BF527 EV-AD5415/49SDZ TO SPORT INTERFACE OPERATING THE EVALUATION BOARD The board requires ±12 V and 5 V supplies. The +12 V VDD and −12 V VSS are used to power the output amplifier; the 5 V supply is used to power the DAC (VDD) and transceivers (VCC). Both supplies are decoupled to their respective ground plane with 10 µF tantalum and 0.1 µF ceramic capacitors. Rev. C | Page 3 of 12 SPORT_TFS SPORT_RFS SPORT_TSCLK SPORT_RSCLK SPORT_DTO SPORT_DRO GPIO1 GPIO2 SYNC SCLK SDIN SDO LDAC CLR Figure 2. ADSP-BF527-to-AD5415 Interface 09973-002 The Analog Devices SDP has one SPORT serial port. The SPORT interface is used to control the AD5415, allowing clock frequencies of up to 30 MHz. UG-296 Evaluation Board User Guide 09973-003 EVALUATION BOARD SOFTWARE Figure 3. Device Manager Showing the SDP Board Connected INSTALLING THE SOFTWARE installation (Found New Hardware Wizard/Install the Software Automatically and so on). The EV-AD5415/49SDZ kit includes the software and drivers on a CD. To install the software, follow these steps: RUNNING THE SOFTWARE 1. To run the evaluation board program, do the following: 3. 4. 5. 1. 2. Rev. C | Page 4 of 12 Click Start/All Programs/Analog Devices/EVAD5415/49SDZ. If the SDP board is not connected to the USB port when the software is launched, a connectivity error displays (see Figure 4.). Simply connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions. 09973-004 2. Install the software before connecting the SDP board to the USB port of the PC. Start the Windows® operating system and insert the EV-AD5415/49SDZ kit CD. Download the EV-AD5415/49SDZ LabVIEW™ software. The correct driver for the SDP board, SDPDriversNET, should download automatically after LabVIEW is downloaded, supporting both 32-bit and 64-bit systems. However, if the drivers do not download automatically, the driver executable file can also be found in the All Programs/Analog Devices folder from the Start menu. Follow the on-screen prompts to install it. After installation of the software and drivers is complete, plug the EV-AD5415/49SDZ into the SDP board and the SDP board into the PC using the USB cable included in the kit. Confirm that the SDP board has been recognized and is displayed in the Device Manager dialog box by clicking Start/Control Panel/System (Hardware)/Device Manager (see Figure 3). When the software detects the evaluation board, proceed through any dialog boxes that appear to finalize the Figure 4. Connectivity Error Evaluation Board User Guide UG-296 09973-005 USING THE EVALUATION BOARD SOFTWARE Figure 5. Evaluation Software Window To operate the evaluation software, 1. 2. Ensure that the PC is connected to the system demonstration platform, EVAL-SDP-CB1Z, and the EVAL-SDP-CB1Z to the evaluation board via the USB cable provided in the kit. Run the program file from Start/All Programs/Analog Devices. The EV-AD5415/49SDZwindow opens, as shown in Figure 5. Example 1 Asynchronous Mode Complete the following steps in the CONTROL FUNCTIONS panel of the evaluation software window: 1. EVALUATION BOARD FUNCTIONS AND REGISTERS From the AD5415 evaluation software window, you can write a data-word to either DAC A or DAC B or both DACs. Type the 12-bit data-word in hexadecimal format in the Enter Data box of the CONTROL FUNCTIONS panel. The AD5415 evaluation software window allows you to evaluate all the functions of the AD5415. Select /LDAC High to tie the load DAC input high for the asynchronous loading mode, specify quarter scale (0x400, 1024 decimal) in the Enter Data box, and select DAC A under Load Input Register. The value is kept in the register, and the DAC does not update until you click Update DAC Outputs under Load and Update. The expected output obtained is VOUT = −VREF × 2. Rev. C | Page 5 of 12 D 1024 = −10 × = −2.5 V 4096 4096 Select Zero Scale under Clear DAC Output to clear the DAC outputs to 0 V. UG-296 Evaluation Board User Guide Synchronous Mode 1. Change Loading Synchronism to Synchronous (/LDAC Control), write 0xC00 (3072 decimal) in the Enter Data box, and select DAC A under Load Input Register. The output does not change until you select /LDAC Low. The expected output for this case is VOUT = −VREF × 2. 2. 3072 D = −10 × = −7.5 V 4096 4096 3. Click DAC A under Initiate Readback to confirm that the last value loaded in the DAC A register is the same as the one read and shown in the DAC A numeric indicator text box. Example 2 Control Register Configuration 1. Click Clear to MidScale under Hardware Clear and Disable under Daisy Chain Mode in the CONTROL REGISTER CONFIGURATION panel. Next, click the Load Control Word button. The DAC B outputs change to midscale (0x800), and the signal in the SDO pin maintains a constant value until the daisy-chain mode is enabled again. Click EXIT when you complete your evaluation. Table 1 and Table 2 describe the control functions and control registers, respectively. The disable daisy-chain and clock data to shift register on rising edge mode functions are loaded with the control register. Although they can also be implemented loading the specified control bits for these functions, they are only available within the control word for the software provided. Working in asynchronous mode, load and update DAC B with full scale (0xFFF). The expected output is D 4095  VOUT =  VREF × n−1  − VREF = 10 ×  − 10 = +10 V 2  2048    Rev. C | Page 6 of 12 Evaluation Board User Guide UG-296 Table 1. Control Functions Control Function Load and Update, DAC A Initiate Readback, DAC A Load Input Register, DAC A Load and Update, DAC B Initiate Readback, DAC B Load Input Register, DAC B Load and Update, Update DAC Outputs (Both DACs) Load Input Register, DAC A and DAC B Clear DAC Output, Zero Scale (Both Outputs) Clear DAC Output, Midscale (Both Outputs) Description Loads the DAC A register with the entered data-word and updates the DAC A output, irrespective of the state of /LDAC. Reads the contents of the DAC A register and displays the value on screen. Loads the DAC A input register with the entered data-word. The DAC A output is updated only if /LDAC is low. Loads the DAC B register with the entered data-word and updates the DAC B output, irrespective of the state of /LDAC. Reads the contents of the DAC B register and displays the value on screen. Loads the DAC B input register with the entered data-word. The DAC B output is updated only if /LDAC is low. Updates both DAC outputs with the entered data-word, irrespective of the state of /LDAC. Loads the input registers of both DACs with the entered data-word. Both outputs are updated only if /LDAC is low. Loads both DACs and updates their outputs with zero-scale code, irrespective of the state of /LDAC. Loads both DACs and updates their outputs with midscale code, irrespective of the state of /LDAC. Table 2. Control Register SDO Configuration Daisy Chain Mode Hardware Clear Active SCLK Edge Load Control Word Description The SDO bits enable you to control the SDO output driver strength, disable the SDO output, or configure the SDO as an open-drain driver. The strength of the SDO driver affects timing. A stronger SDO output driver allows a faster clock cycle to be used. Enables or disables daisy-chain functionality. Sets the value to which the outputs are cleared on the falling edge of the CLR signal. The value can be either zero scale or midscale. Selects the edge of SCLK on which data is clocked into the input register. Data is clocked out from SDO on the opposite edge. Loads control register mode. Rev. C | Page 7 of 12 UG-296 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK SCHEMATICS 09973-006 Figure 6. Evaluation Board Schematic Part A (AD5415) Rev. C | Page 8 of 12 UG-296 09973-007 Evaluation Board User Guide 09973-008 Figure 7. Evaluation Board Schematic Part B (AD5449) Figure 8. Evaluation Board Schematic Part C (SDP Board) Rev. C | Page 9 of 12 UG-296 Evaluation Board User Guide 09973-009 EVALUATION BOARD LAYOUT 09973-010 Figure 9. Component-Side Artwork Figure 10. Silkscreen—Component-Side View (Top) Rev. C | Page 10 of 12 UG-296 09973-011 Evaluation Board User Guide Figure 11. Solder-Side Artwork RELATED LINKS Resource AD5415 AD5449 ADR01 AD8065 Description Product Page, AD5415 Dual 12-Bit, High Bandwidth, Multiplying DAC with Four-Quadrant Resistors and Serial Interface Product Page, AD5449 Dual 12-Bit, High Bandwidth Multiplying DAC with Serial Interface Product Page, ADR01 Ultracompact, Precision 10.0 V Voltage Reference Product Page, AD8065 High Performance, 145 MHz FastFET™ Op Amp Rev. C | Page 11 of 12 UG-296 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. 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