User's Guide SBAU149A – June 2009 – Revised July 2009 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK ADS1246EVM (Left) and ADS1246EVM-PDK (Right) This user's guide describes the characteristics, operation, and use of the ADS1146EVM and ADS1246EVM, both by themselves and as part of the ADS1146EVM-PDK or ADS1246EVM-PDK. These evaluation modules (EVMs) are evaluation boards for the ADS1246, a 24-bit delta-sigma analog-to-digital converter (ADC), and the ADS1146, a 16-bit version of the ADS1246. The EVM allows evaluation of all aspects of the ADS1146 or ADS1246 devices. Complete circuit descriptions, schematic diagrams, and a bill of materials are included in this document. The following related documents are available through the Texas Instruments web site at http://www.ti.com. EVM-Compatible Device Data Sheets SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback Device Literature Number ADS1146 SBAS453 ADS1246 SBAS426A REF5020 SBOS410C OPA227 SBOS110A TPS3836L30 SLVS292D TPS79225 SLVS337B TPS72325 SLVS346B SN74LVC2G157 SCES207K PCA9535 SCPS129I ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 1 www.ti.com 1 2 3 4 5 6 7 8 9 10 Contents EVM Overview ............................................................................................................... 3 Analog Interface.............................................................................................................. 4 Digital Interface .............................................................................................................. 4 Power Supplies .............................................................................................................. 5 Voltage Reference ........................................................................................................... 6 Clock Source ................................................................................................................. 7 EVM Operation ............................................................................................................... 7 ADS1246EVM-PDK Kit Operation ......................................................................................... 8 Evaluating Performance with the ADCPro Software ................................................................... 16 Schematics and Layout .................................................................................................... 23 List of Figures 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Reference Select Switch S1 ................................................................................................ 6 Jumper J2 ..................................................................................................................... 7 ADS1246EVM Default Jumper Locations ................................................................................ 8 Virtual COM Port Installer................................................................................................... 9 Virtual COM Port Setup ..................................................................................................... 9 MMB3 Switch Locations .................................................................................................. 10 Connecting ADS1246EVM to MMB3 ................................................................................... 10 MMB3 Block Diagram...................................................................................................... 11 ADCPro Software Start-Up Display Window............................................................................ 12 ADS1246EVM-PDK Plug-In Display Window........................................................................... 13 Connection Timeout ....................................................................................................... 14 Firmware Download Message Box ...................................................................................... 14 Firmware Download Progress Indicator ................................................................................. 15 Firmware Download Complete Message Box .......................................................................... 15 I/O Config Tab ............................................................................................................. 17 Enabling VBIAS on a Channel ........................................................................................... 18 Cal Tab ..................................................................................................................... 20 About Tab ................................................................................................................... 21 Progress Bar While Collecting Data ..................................................................................... 22 List of Tables 1 2 3 4 5 6 7 J8/J4: Analog Interface Pinout ............................................................................................. 4 J7: Serial Interface Pins ..................................................................................................... 4 J3 Configuration: Power-Supply Input .................................................................................... 5 J10 Configuration: Power Options ......................................................................................... 6 Reference Voltage Options ................................................................................................. 6 List of Switches .............................................................................................................. 8 ADS1146EVM/ADS1246EVM Bill of Materials ......................................................................... 23 ADCPro is a trademark of Texas Instruments. Microsoft, Windows are registered trademarks of Microsoft Corporation. I2C is a trademark of NXP Semiconductors. All other trademarks are the property of their respective owners. 2 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback EVM Overview www.ti.com 1 EVM Overview 1.1 Features ADS1146EVM/ADS1246EVM Features: • Contains all support circuitry needed for the ADS1146/ADS1246 • ±2.5V and +5V power supply options for ADC • Voltage reference options: external or onboard • Compatible with the TI Modular EVM System ADS1146EVM-PDK/ADS1246EVM-PDK Features: • Easy-to-use evaluation software for Microsoft® Windows® XP • Data collection to text files • Built-in analysis tools including scope, FFT, and histogram displays • Complete control of board settings • Easily expandable with new analysis plug-in tools from Texas Instruments For use with a computer, the ADS1146EVM-PDK or ADS1246EVM-PDK is available. This kit combines the ADS1146/ADS1246EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™ software for evaluation. The MMB3 motherboard allows the ADS1146/ADS1246EVM to be connected to the computer via an available USB port. This manual shows how to use the MMB3 as part of the ADS1146EVM-PDK/ADS1246EVM-PDK, but does not provide technical details about the MMB3 itself. ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins. The ADS1146EVM-PDK/ADS1246EVM-PDK is controlled by a plug-in running in ADCPro. For more information about ADCPro, see the ADCPro™ Analog-to-Digital Converter Evalutation Software User's Guide (literature number SBAU128), available for download from the TI web site. This manual covers the operation of both the ADS1146/ADS1246EVM and the ADS1146EVM-PDK/ADS1246EVM-PDK. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the ADS1146/ADS1246EVM. For clarity of reading, the rest of this manual will refer only to the ADS1246EVM or ADS1246EVM-PDK, but operation of the EVM and kit for the ADS1146 is identical, unless otherwise noted. 1.2 Introduction The ADS1246EVM is an evaluation module built to the TI Modular EVM System specification. It can be connected to any modular EVM system interface card. The ADS1246EVM is available as a stand-alone printed circuit board (PCB) or as part of the ADS1246EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the ADS1246EVM is useful for prototyping designs and firmware. Note that the ADS1246EVM has no microprocessor and cannot run software. To connect it to a computer, some type of interface is required. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 3 Analog Interface 2 www.ti.com Analog Interface For maximum flexibility, the ADS1246EVM is designed for easy interfacing to multiple analog sources. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J8. This header/socket provides access to the analog input pins of the ADS1246. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. These signals can also be connected to the terminal block J4. All of the pins on J4 and J8 are connected with minimal filtering or protection. Use appropriate caution when handling these pins. Table 1 summarizes the pinouts for analog interfaces J4 and J8. Table 1. J8/J4: Analog Interface Pinout Signal Description, ADS1146/ADS1246 J8.1, J4-2 A0(–) AINN J8.2, J4-1 A0(+) AINP J8.3-8 Unused — J8.18 REF– External Reference source input (– side of differential input) J8.20 REF+ External Reference source input (+ side of differential input) J8.10-16 (even) Unused — J8.15 Unused J8.9-19 (odd), J4-9 AGND Pin Number 3 Digital Interface 3.1 Serial Data Interface — Analog ground connections (except J8.15) The ADS1246EVM is designed to easily interface with multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket combination at J7. This header/socket provides access to the digital control and serial data pins of the ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options. All logic levels on J7 are 3.3V CMOS, except for the I2C™ pins. These pins conform to 3.3V I2C rules. Table 2 describes the J7 serial interface pins. Table 2. J7: Serial Interface Pins 4 Pin No. Pin Name Signal Name I/O Type Pullup J7.1 CNTL CS In High Function J7.2 GPIO0 START In High J7.3 CLKX SCLK In None ADS1246 SPI clock J7.4 DGND DGND In/Out None Digital ground J7.5 CLKR Unused — None J7.6 GPIO1 MR In High J7.7 FSX Unused — None J7.8 GPIO2 Unused — None Master reset J7.9 FSR DRDY Out None J7.10 DGND DGND In/Out None Digital ground J7.11 DX DIN In None ADS1246 SPI data in ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback Power Supplies www.ti.com Table 2. J7: Serial Interface Pins (continued) Pin No. Pin Name Signal Name I/O Type Pullup J7.12 GPIO3 PWRSEL In High Selects ±2.5V or +5V supply J7.13 DR DOUT/DRDY Out None ADS1246 data out J7.14 GPIO4 Unused — None J7.15 INT DRDY Out None J7.16 SCL SCL I2C High I2C clock J7.17 TOUT CLK In None Can be used to provide a clock from a processor Digital ground J7.18 DGND DGND In/Out None J7.19 GPIO5 CLK Select — None J7.20 SDA SDA I2C High Function I2C data Many pins on J7 have weak pull-up resistors. These resistors provide default settings for many of the control pins. Many pins on J7 correspond directly to ADS1246 pins. See the ADS1246 data sheet for complete details on these pins. 4 Power Supplies J3 is the power-supply input connector. Table 3 lists the configuration details for J3. Table 3. J3 Configuration: Power-Supply Input Pin No. Pin Name Function Required J3.1 +VA Unused No J3.2 –VA Unused No J3.3 +5VA +5V analog supply Always J3.4 –5VA –5V analog supply Only in bipolar mode J3.5 DGND Digital ground input Yes J3.6 AGND Analog ground input Yes J3.7 +1.8VD 1.8V digital supply No J3.8 +3.3VD 3.3V digital supply Always J3.9 VD1 Unused No J3.10 +5VD +5V digital supply No All of the power supplies (AVDD, AVSS, and DVDD) have corresponding jumpers on J10 that can be replaced with a current meter to measure the respective supply currents. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 5 Voltage Reference 4.1 www.ti.com Power Options J10 is arranged as five rows, each of which can be shorted. Table 4 lists the power option details for J10. For normal operation, J10.1-2, J10.3-4, and J10.5-6 must be connected (direct or through an ammeter), and either (or both) of J10.7-8 and J10.9-10 must be connected; otherwise, the board will not function. Table 4. J10 Configuration: Power Options 5 Row Name 1-2 ADC AVDD AVDD supply current measurement point for the ADC. Must be connected for operation. Function 3-4 ADC AVSS AVSS supply current measurement point for the ADC. Must be connected for operation. 5-6 ADC DVDD DVDD supply current measurement point for the ADC. Must be connected for operation. 7-8 DGND Connects DGND to board ground. 9-10 AGND Connects AGND to board ground. Voltage Reference The ADS1246 device always uses an external reference. The EVM provides a 2.048V reference for the device from U1, filtered and buffered through U2. This 2.048V may be used to drive the REFP input, or REFP can be connected to the external reference on J8 through switch S1. REFP should not be connected to AVDD through switch S1 because this connection will violate the specification for the maximum reference input. Figure 1 shows switch S1 as it appears on the EVM. The low side of the reference (REFN) is tied to AVSS. The different reference options under different supply conditions are outlined in Table 5. Figure 1. Reference Select Switch S1 Table 5. Reference Voltage Options (1) 6 AVDD AVSS J1 Setting S1 Position (1) REFP REFN 5V 0V 1-2 BUFF 2.048V 0V 2.048V 5V 0V 2-3 BUFF 0V 0V Invalid Selection Reference Voltage 5V 0V — Center REF+ (J8.20) 0V Up to AVDD – 1 2.5V –2.5V 1-2 BUFF –0.452V –2.5V 2.048V 2.5V –2.5V 2-3 BUFF 0V –2.5V 2.5V 2.5V –2.5V — Center REF+ (J8.20) –2.5V Up to AVDD – AVSS – 1 Switch S1 should not be set to AVDD. ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback Clock Source www.ti.com 6 Clock Source The ADS1246 has an internal clock or can be provided an external clock. The EVM uses the internal clock mode only. Provision is made on the EVM circuit board, however, for an external clock source. A footprint is provided at U8 for a crystal oscillator to be mounted on the board. An external clock may also be provided by a processor on the TOUT pin (J7.17), or an external clock source connected to J9.1 (ground) and J9.2 (signal). J2 controls how the clock source is selected. With pins J2.1 and J2.2 shorted, GPIO5 from J7.19 can control whether the A or B side of U7 is selected. If the A side is selected, the clock should come from an external source provided as described above. If the B side is selected, the clock should come from the crystal oscillator. If a selection is made and no clock is provided on that input, the ADS1246 detects that no external clock is present and enables its internal oscillator. 6.1 Usage in PDK If using the ADS1246EVM as part of the ADS1246EVM-PDK, remove any shorting blocks on jumper J6, and make sure J2 has a jumper between pins 1 and 2 (the IO position). This configuration grounds the CLK input to the ADS1246 and ensures that the internal oscillator starts up. 6.2 Usage as a Stand-Alone EVM If using the EVM in your own system and not with the PDK hardware and software, observe the following recommendations: • J6 should be removed if the external clock source is used and the TOUT pin is still driven by a processor in order to avoid conflicts. • Jumper J2 can be used to always select the U8 oscillator (DVDD position) or allow the onboard/external clock selection to be controlled by GPIO5 (J7.19) as shown in Figure 2. Figure 2. Jumper J2 7 EVM Operation This section provides information on the analog input, digital control, and general operating conditions of the ADS1246EVM. 7.1 Analog Input The analog input source can be applied directly to J8 (top or bottom side) or through signal-conditioning modules available for the the modular EVM system. Terminal block J4 is connected in parallel with the analog signal connections to J8. The input has a 47Ω/47pF RC filter in series with it, and a differential 0.1µF capacitor is across the input pair for use with differential signals. 7.2 Digital Control The digital control signals can be applied directly to J7 (top or bottom side). The modular ADS1246EVM can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface or HPA-MCU Interface boards available from Texas Instruments, or the MMB3 if purchased as part of the ADS1246EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the ADS1246, see the relevant product folder on the TI web site. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 7 ADS1246EVM-PDK Kit Operation 7.3 www.ti.com Default Jumper Settings and Switch Positions Figure 3 shows the jumpers found on the EVM and the respective factory default conditions for each. Figure 3. ADS1246EVM Default Jumper Locations Table 6 lists the switches found on the EVM and the respective factory default conditions for each. Table 6. List of Switches 8 Switch Default Position Switch Description S1 Left Onboard reference ADS1246EVM-PDK Kit Operation This section provides information on using the ADS1246EVM-PDK, including setup, program installation, and program usage. To prepare Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. to evaluate the ADS1246 with the ADS1246EVM-PDK, complete the following steps: Install the ADCPro software (if not already installed) on a PC. Install the ADS1246EVM-PDK EVM plug-in software. Complete the USB driver installation process. Set up the ADS1246EVM-PDK. Connect the ADS1246EVM-PDK to the computer with a USB cable. Run the ADCPro software. Each task is described in the subsequent sections of this document. 8 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1246EVM-PDK Kit Operation www.ti.com 8.1 Installing the ADCPro Software CAUTION Do not connect the ADS1246EVM-PDK before installing the software on a suitable PC. Failure to observe this caution may cause Microsoft Windows to not recognize the ADS1246EVM-PDK as a connected device. The CD-ROM shipped with the ADS1246EVM contains an installer for ADCPro as well as an installer for the ADS1246EVM plug-in. The latest software is available from the TI website at http://www.ti.com/. Refer to the ADCPro User Guide for instructions on installing and using ADCPro. To install the ADS1246EVM-PDK plug-in, run the file: ads1246evm-pdk-plug-in-1.0.0.exe (1.0.0 is the version number, and increments with software version releases - you may have a different version on your CD). Double-click the file to run it; then follow the instructions shown. You can also utilize the ADCPro Update Check feature to check for newer versions of the ADS1246EVM-PDK plug-in, once you have installed a version of it. Follow the on-screen prompts. Once the ADCPro plug-in installs, you will be prompted to install the Virtual COM port driver as shown in Figure 4. Figure 4. Virtual COM Port Installer Press OK and the screen shown in Figure 5 is displayed. Figure 5. Virtual COM Port Setup If you already have a TUSB3410 Virtual COM port driver installed on your system, select Cancel; otherwise, press Setup and follow the on-screen prompts. You may be notified that the driver is not digitally signed. If this message appears, select Continue Anyway and proceed. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 9 ADS1246EVM-PDK Kit Operation 8.2 www.ti.com Setting Up the ADS1246EVM-PDK The ADS1246EVM-PDK contains both the ADS1246EVM and the MMB3 motherboard; however, the devices are shipped unconnected. Follow these steps to set up the ADS1246EVM-PDK. Step 1. Unpack the ADS1246EVM-PDK kit. Step 2. Set the switches on the MMB3 as described below, as shown in Figure 6. • Set switch SW4 to the right. • Set the DAC switch (SW5) to the OUT position (to the right). Figure 6. MMB3 Switch Locations Step 3. Plug the ADS1246EVM into the MMB3 as Figure 7 illustrates. Figure 7. Connecting ADS1246EVM to MMB3 10 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1246EVM-PDK Kit Operation www.ti.com CAUTION Do not misalign the pins when plugging the ADS1246EVM into the MMB3. Check the pin alignment carefully before applying power to the PDK. Step 4. 8.2.1 Set the jumpers and switches on the ADS1246EVM as shown in Figure 3 (note that these settings are the factory-configured settings for the EVM). About the MMB3 The MMB3 is a Modular EVM System motherboard. It is designed around the MSP430F449, a low-power microcontroller from Texas Instruments. Figure 8 shows a block diagram of the MMB3. USB USB RESET +5VA -5VA +5VD PWR & VREF +3.3V +1.8V +10V TUSB3410 -10V Supplied to Daughtercard Power Connector LCD DISPLAY 2.5V OPER BSL +1 DAC1220 MSP430F449 RESET -1 DAC IN OUT Analog Daughtercard Modular Connectors Serial Power Joystick Power from PWR & VREF Block Figure 8. MMB3 Block Diagram The MMB3 was designed to be used as a stand-alone demonstration platform for low-speed data converters. It features an onboard 20-bit digital-to-analog converter (DAC) that can be used as a signal source for an ADC under test, and has a joystick for control of functions on the board when it is not controlled by a PC. These features are experimental and not supported in the ADS1246EVM-PDK at this time. The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA, –5VA, and ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 11 ADS1246EVM-PDK Kit Operation www.ti.com The MMB3 is not sold as a microcontroller development board, and it is not available separately. TI cannot offer support for the MMB3 except as part of an EVM kit. For schematics or other information about the MMB3, contact Texas Instruments. 8.3 EVM Power Supply The ADS1246EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3 provides 3.3V and ±5V to the ADS1246EVM. 8.4 Running the Software and Download of Firmware to MMB3 Note: The software is continually under development. These instructions and screen images are current at the time of this writing, but may not exactly match future releases. The program for evaluating the ADS1246EVM-PDK is called ADCPro. This program uses plug-ins to communicate with the EVM. The ADS1246EVM-PDK plug-in is included in the ADS1246EVM-PDK package. The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista is NOT supported. If this is the first time installing ADCPro and plug-ins, follow these procedures to run ADCPro and perform any necessary firmware installations. Make sure the ADCPro software and device plug-in software are installed from the CD-ROM as described in . Step 1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 9 appears. Figure 9. ADCPro Software Start-Up Display Window 12 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1246EVM-PDK Kit Operation www.ti.com space Step 2. Select ADS1246EVM from the EVM drop-down menu. The ADS1246EVM-PDK plug-in appears in the left pane, as shown in Figure 10. Figure 10. ADS1246EVM-PDK Plug-In Display Window Step 3. The ADS1246EVM-PDK plug-in window has a status area at the top of the screen. When the plug-in is first loaded, the plug-in searches for the board. You will see a series of messages in the status area indicating this action. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 13 ADS1246EVM-PDK Kit Operation space Step 4. www.ti.com If the plug-in cannot connect to the EVM, you will see a window as shown in Figure 11. This message may indicate that the firmware is not loaded on the MMB3. You may select Retry Auto Connect; if that action fails, select Retry Manual Connect and specify the COM port to be used. Figure 11. Connection Timeout Step 5. The plug-in detects whether or not the board has the correct firmware loaded. The first time you use the ADS1246EVM-PDK, the firmware for the MMB3 may need to be downloaded to the MMB3. If the firmware must be loaded, you will see a screen similar to that shown in Figure 12. Figure 12. Firmware Download Message Box 14 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1246EVM-PDK Kit Operation www.ti.com Switch the BSL switch (SW4) on the MMB3 to the BSL position (to the left) as instructed, then press OK. The plug-in downloads the firmware to the MMB3. This operation may take a couple of minutes, so the progress is updated in the message at the top of the ADS1246 plug-in window (as Figure 13 shows). The firmware is saved in flash memory on the MMB3, so this operation should only need to be performed once. Figure 13. Firmware Download Progress Indicator When the firmware download completes, the message box shown in Figure 14 appears. Follow the on-screen instructions and the plug-in should now connect to the EVM. Figure 14. Firmware Download Complete Message Box SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 15 Evaluating Performance with the ADCPro Software 9 www.ti.com Evaluating Performance with the ADCPro Software The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option from the corresponding menu. Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous plug-in is unloaded. 9.1 Using the ADS1246EVM-PDK Plug-in The ADS1246EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS1246. It consists of a tabbed interface (see Figure 15), with different functions available on different tabs. These controls are described in this section. You can adjust the ADS1246EVM settings when you are not acquiring data. During acquisition, all controls are disabled and settings may not be changed. When you change a setting on the ADS1246EVM plug-in, the setting immediately updates on the board. Settings on the ADS1246EVM correspond to settings described in the ADS1246 data sheet (available for download at http://www.ti.com); see the data sheet for details. The ADS1246EVM-PDK plug-in has a tabbed interface, with three different tabs to control the functions of the ADS1246. These tabs are described below. 16 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback www.ti.com 9.1.1 Evaluating Performance with the ADCPro Software Configuration Tab This tab (shown in Figure 15) is the primary tab that controls the function of the multiplexer and power and reference settings in the ADS1246. The tab is divided into two sections: I/O Configuration and Supply Configuration. Figure 15. I/O Config Tab SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 17 Evaluating Performance with the ADCPro Software 9.1.1.1 www.ti.com I/O Configuration Section Each input channel can have a VBIAS applied to it. Checking the VBIAS box on a channel applies the VBIAS voltage, which is approximately half the value of the supply. You can test this option as shown in Figure 16, using one input tied to something close to ground (make sure you observe the common-mode restrictions listed in the ADS1246 device data sheet) as a reference for this signal. Figure 16. Enabling VBIAS on a Channel 18 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback Evaluating Performance with the ADCPro Software www.ti.com The System Monitor button allows you to access the internal system monitor channels of the ADS1246. When pressed, this button disables the other analog input channel controls, and the system monitor channel selections are enabled. You can select Offset, Gain, or Temperature as the channel to convert. Note that some of these channels are scaled by a factor when read; refer to the ADS1246 data sheet to determine these factors. The PGA Gain control sets the PGA gain, and the Data Rate control sets the data rate for the device. Note that the data rate can go quite low; therefore, if the block size is large, the time it takes to collect a block of data can be quite long. It is advisable to first test collection at the higher data rates. Once a test is known to work properly, drop down to the lower data rate and allow sufficient time to collect the data. The BCS control sets the current level of the burnout current sources; it may be set Off, or to 0.5µA, 2µA, or 10µA. The Power Down control powers down the ADS1246. Note that no data can be collected if the Power Down button is activated. 9.1.1.2 Supply Configuration This section controls the selection of the power supply mode and reference voltage. The Power Supply control selects between single supply (+5V) mode and bipolar supply (±2.5V) mode. The EVM draws its supply voltages from the MMB3 motherboard, and has onboard circuitry to select between the +5V and bipolar supplies. The VREF value is set to 2.048V, with switch S1 set to BUFF. S1 should not be set to the AVDD position, in order to prevent the reference from exceeding the maximum specified input. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 19 Evaluating Performance with the ADCPro Software 9.1.2 www.ti.com Cal Tab The Cal tab (shown in Figure 17) controls the calibration functions of the ADS1246. Figure 17. Cal Tab Pressing the Self Offset Calibrate button causes the ADS1246 to perform a self calibration; the offset and full-scale register values are then updated on the plug-in screen. You may also write to these registers by typing in hex values in the New fields, then press the Set button. You may read the values at any time by pressing the Read button. 20 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback www.ti.com 9.1.3 Evaluating Performance with the ADCPro Software About Tab The About tab displays information about the EVM and software, as shown in Figure 18. Figure 18. About Tab The Plugin Version and Firmware Version indicators show the version numbers of the plug-in and firmware code, respectively. The ID indicator shows the value of the ID [3:0] bits in the ADS1246 ID register. The Notes indicator may show relevant notes about the plug-in or firmware code, if there are any. SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 21 Evaluating Performance with the ADCPro Software 9.1.4 www.ti.com Collecting Data Once you have configured the ADS1246 for your test scenario, press the ADCPro Acquire button to start the collection of the number of datapoints specified in the Test plug-in Block Size control. The ADS1246EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress bar as shown in Figure 19. Figure 19. Progress Bar While Collecting Data For more information on testing analog-to-digital converters in general and using ADCPro and Test plug-ins, refer to the ADCPro User Guide. 22 ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback Schematics and Layout www.ti.com 9.2 Troubleshooting If the ADS1246EVM plug-in cannot find the ADS1246EVM-PDK, press the USB RESET button on the MMB3 (refer to Figure 6) and try again. If ADCPro stops responding while the ADS1246EVM-PDK is connected, try unplugging the USB cable from the PDK. Unload and reload the plug-in before reapplying power to the PDK. 10 Schematics and Layout Schematics for the ADS1146EVM and ADS1246EVM are appended to this user's guide. The bill of materials is provided in Table 7. 10.1 Bill of Materials Note: All components should be compliant with the European Union Restriction on Use of Hazardous Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased components are RoHS-compliant. (For more information about TI's position on RoHS compliance, see the http://www.ti.com.) Table 7. ADS1146EVM/ADS1246EVM Bill of Materials Item No. Qty 1 1 Value Ref Des 2 4 1µF C1-C3, C17 3 2 22µF 4 9 5 N/A Description Vendor Part Number Texas Instruments 6508033 Capacitor, X7R Ceramic 1µF ±10%, 16WV, Size = 0603 TDK C1608X7R1C105KT C4, C5 Capacitor, X5R Ceramic 22µF ±20%, 16WV, Size = 1210 TDK C3225X5R1C226MT 0.1µF C6-C13, C15 Capacitor, X7R Ceramic 0.1µF ±10%, 25WV, Size = 0603 TDK C1608X7R1E104KT 1 0.15µF C14 Murata GRM188R71C154KA0 1D 6 6 10µF C16, C18, C19, C21-C23 Capacitor, X5R Ceramic 10µF ±20%, 6.3WV, Size = 0805 TDK C2012X5R0J106MT 7 2 47pF C24, C25 Capacitor, C0G Ceramic 47pF ±5%, 50WV, Size = 0603 TDK C1608C0G1H470JT 8 1 10nF C20 Capacitor, C0G Ceramic 10nF ±5%, 25WV, Size = 0603 TDK C1608C0G1E103JT 9 3 D1, D2, D5 Fairchild BAT54 10 2 D3, D4 5.1V, Zener Diode On Semiconductor MMBZ5231BLT1G 11 2 J1, J2 Header Strip, 3-pin ( ) Samtec TSW-103-07-L-S 12 1 J3A 10-pin SMT Plug Samtec TSM-105-01-L-DV-P 13 1 J3B 10-pin SMT Socket 14 1 J4 Terminal Block, 3 position 15 0 J5 Header Strip, 6-pin ( ) 16 2 J6, J9 17 2 18 2 19 1 J10 20 2 Q1, Q2 21 1 22 1 100kΩ SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback ADS1246 EVM PWB Capacitor, X7R Ceramic 0.15µF ±10%, 16WV, Size = 0603 DIODE SCHOTTKY 30V 200MA SOT-23 Samtec SSW-105-22-F-D-VS-K On Shore Technology ED555/3DS Header Strip, 2 pin ( ) Samtec TSW-102-07-L-S J7A, J8A 20-pin SMT Plug Samtec TSM-110-01-L-DV-P J7B, J8B 20-pin SMT Socket Samtec SSW-110-22-F-D-VS-K Header Strip, 10-pin ( ) Samtec TSW-105-07-L-D MOSFET, P-Channel, 2.5V Fairchild FDN302P Q3 Enhancement Mode FET, N-Channel Fairchild FDN337N RA1 Resistor, 8 Thick Film Chip Array 100kΩ, 5%, 63mW CTS 745C101104JPTR ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK 23 Schematics and Layout www.ti.com Table 7. ADS1146EVM/ADS1246EVM Bill of Materials (continued) 24 Item No. Qty 23 0 Value Ref Des Vendor Part Number 24 1 10kΩ R1 Resistor, Thick Film Chip 10kΩ, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ103V 25 1 2kΩ R2 Resistor, Thick Film Chip 2kΩ, 1%, 1/16W, Size = 0603 Panasonic ERJ-3EKF2001V 26 4 47Ω R3, R4, R7, R10 Resistor, Thick Film Chip 47Ω, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ470V 27 2 2.7kΩ R5, R6 Resistor, Thick Film Chip 2.7kΩ, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ272V 28 2 100kΩ R8, R13 Resistor, Thick Film Chip 100kΩ, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ104V 29 1 47kΩ R11 Resistor, Thick Film Chip 47kΩ, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ473V 30 2 0 R14, R15 Resistor, Thick Film Chip 0Ω, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEY0R00V 31 2 470kΩ R9, R12 Resistor, Thick Film Chip 470kΩ, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ474V 32 1 S1 NKK SS14MDP2 33 0 TP1, TP2, TP4 34 1 TP3 PCB Test Point, Large Loop, Through-Hole Keystone Electronics 5011 35 1 U1 Precision Voltage Reference, 2.048V Texas Instruments REF5020ID 36 1 U2 Precision Operational Amplifier Texas Instruments OPA227U 37 1 U3 16-Bit I2C I/O Expander Texas Instruments PCA9535RGE 38 1 U4 Inverter, Single Gate Texas Instruments SN74AHCT1G04DBVR 39 1 U5 Buffer, Open Drain, Single Gate Texas Instruments SN74LVC1G07DBVRG 4 40 1 U6 LDO Voltage Regulator, 2.5V, 100mA Texas Instruments TPS79225DBVRG4 41 1 U7 Single, 2-Line to 1 Data Selector/Multiplexer Texas Instruments SN74LVC2G157DCT 42 0 U8 3.3 V Oscillator 43 1 U9 LDO Voltage Regulator, 2.5V, 200mA Texas Instruments TPS72325DBVTG4 44 1 U10 Precision Delta-Sigma ADC, 24-bit/16-bit Texas Instruments ADS1246IPW/ADS114 6IPW 45 1 U11 EEPROM, 1.8V, 256k 46 1 U12 Supervisor, 2.64V Threshold 47 8 N/A Shorting Blocks RA2 Description Resistor, Chip Array 4 Independent Bus 100kΩ, 5%, 1/16W, SMD Switch, Mini Slide, SP3T PCB Test Point, Mini Loop, Through-Hole ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK Microchip 24AA256-I/ST Texas Instruments TPS3836L30DBVT Samtec SNT-100-BK-T SBAU149A – June 2009 – Revised July 2009 Submit Documentation Feedback 1 2 3 4 5 150nF DVDD 4 VIN TEMP GND C1 1uF VOUT TRIM 6 C4 22uF 5 C5 22uF 0.1uF 0.1uF U12 5 C15 0.1uF -5V 4 TP1 AVSS REF5020ID D VDD RESET CT GND MR 1 2 3 TPS3836DBV C22 10uF AVDD DVDD J7 DVDD R15 0 C21 10uF 10uF 1 5 6 10 R14 0 1 3 5 7 9 11 13 15 17 19 C23 12 16 15 13 14 11 4 R10 GPIO0 DGND GPIO1 GPIO2 DGND GPIO3 GPIO4 SCL DGND SDA R5 2.7K 2 47 C J6 6 5 4 3 2 1 1 J7A (TOP) = SAM_TSM-110-01-L-DV-P J7B (BOTTOM) = SAM_SSW-110-22-F-D-VS DVDD ADS1146IPW ADS1246IPW C3 3 2 1 J9 R12 470K R11 47K JPR-1X3 1uF 7 8 9 10 11 12 EXT CLK INPUT GPIO5 DVDD U3 2 J2 TERMBLOCK-3 U7 B A0(-) A1(-) A2(-) A3(-) AGND AGND AGND VCOM AGND AGND A0(+) A1(+) A2(+) A3(+) A4 A5 A6 A7 REFREF+ 2 4 6 8 10 12 14 16 18 20 8 5 3 7 TP4 AVDD AVDD VCC A/B Y A Y B G GND 6 1 2 4 SN74LVC2G157DCT +3.3V D1 FRC_BAT54 DAUGHTER-ANALOG 1 C2 1uF D3 ONS_MMBZ5231BLT1 IN 3 OUT BYP GND EN DVDD J10 5 4 2 C11 0.1uF TPS79225DBV C18 10uF 1 3 EOH OUT R9 470K DVDD 4 2 VCC GND A2 A1 INT VCC SDA SCL C20 10nF C0G CRY_C3391-4.096 24 23 22 21 20 19 DVDD C12 0.1uF PCA9535RGE AVDD +2.5V U6 +5V RefRef+ U8 OBCLK P06 P07 GND P10 P11 P12 P13 P14 P15 P16 P17 A0 J8 1 3 5 7 9 11 13 15 17 19 R6 2.7K SERIALHDR TOUT 9 47pF CLK AINN 2 3 8 C25 3 R7 47 DVDD C7 0.1uF 1 2 CS SCLK DIN DRDY DOUT/DRDY START RESET DGND 47pF AINP AVSS J4 C24 REFP REFN 47 7 AVDD U10 R4 C CNTL CLKX CLKR FSX FSR DX DR INT TOUT GPIO5 2 4 6 8 10 12 14 16 18 20 P05 P04 P03 P02 P01 P00 2 3 4 C16 10uF NKK_SS14MDP2 D2 FRC_BAT54 13 14 15 16 17 18 10K U1 47 C8 1 7 1 8 1 2 3 OPA227 C10 S1 Ref+ R3 6 3 TP2 REFP D5 FRC_BAT54 0.1uF U2 2 R1 APPROVED RA1A 100K AVDD C6 +5V ENGINEERING CHANGE NUMBER C14 +5V D REV DVDD 2K J1 JPR-1X3 6 REVISION HISTORY R2 1 3 5 7 9 2 4 6 8 10 B JUMPER FUNCTIONS DVDD ADC AVDD ADC AVSS DIGITAL=3.3V DGND AGND RA2 100K JPR-2X5 J8A (TOP) = SAM_TSM-110-01-L-DV-P J8B (BOTTOM) = SAM_SSW-110-22-F-D-VS-K 5 SN74AHCT1G04DBV +5V 4 FRC_FDN302P 3 4 -2.5V U9 -5V -5VA 2 3 C17 1uF 1 3 5 7 9 D4 ONS_MMBZ5231BLT1 5.1V IN EN OUT BYP GND 2 4 6 HEADER-3X2_SPECIAL J3 SN74LVC1G07DBV 3 2 1 3 5 R8 100K U5 2 5 U4 U11 J5 Q1 +5V +VA +5VA DGND +1.8VD +3.3VD -VA -5VA AGND VD1 +5VD 2 4 6 8 10 1 2 3 7 A0 A1 A2 WP MCP_24AA256-I/ST C13 0.1uF C19 10uF J3A (TOP) = SAM_TSM-105-01-L-DV-P J3B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K ti +5V A R13 100K TP3 GND PRECISION ANALOG PRODUCTS Q3 HIGH-PERFORMANCE ANALOG DIVISION SEMICONDUCTOR GROUP 5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA FRC_FDN337N FRC_FDN302P DRAWN BY BOB BENJAMIN DOCUMENT CONTROL NO. 6508032 SHEET 2 ADS1146EVM ADS1246EVM TITLE ENGINEER RICK DOWNS GND 1 C9 0.1uF DAUGHTER-POWER 5 4 1 TPS72325DBV Q2 DVDD 8 5 6 4 VCC SDA SCL GND 3 4 5 1 OF 1 SIZE B DATE 30-MAR-2009 FILE 6 REV A A EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 3.3V to 5V and the output voltage range of 0V to 5V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than +30°C. The EVM is designed to operate properly with certain components above +85°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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