User's Guide SBAU148B – June 2009 – Revised May 2011 ADS1147EVM, ADS1247EVM, ADS1147EVM-PDK, ADS1247EVM-PDK ADS1247EVM (Left) and ADS1247EVM-PDK (Right) This user's guide describes the characteristics, operation, and use of the ADS1147EVM and ADS1247EVM, both by themselves and as part of the ADS1147EVM-PDK or ADS1247EVM-PDK.
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 ...................................................................
EVM Overview www.ti.com 1 EVM Overview 1.1 Features ADS1147EVM/ADS1247EVM Features: • Contains all support circuitry needed for the ADS1147/ADS1247 • ±2.
Analog Interface 2 www.ti.com Analog Interface For maximum flexibility, the ADS1247EVM 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 ADS1247. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector options.
Power Supplies www.ti.com Table 2. J7: Serial Interface Pins (continued) Pin No. Pin Name Signal Name I/O Type Pullup J7.13 DR DOUT/DRDY Out None Function 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 J7.18 DGND DGND In/Out None Digital ground J7.19 GPIO5 CLK Select — None J7.
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 does not function. Table 4. J4 Configuration: Power Options 5 Row Name Function 1-2 ADC AVDD AVDD supply current measurement point for the ADC.
Clock Source www.ti.com 6 Clock Source The ADS1247 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).
ADS1247EVM-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. ADS1247EVM Default Jumper Locations Table 6 lists the switches found on the EVM and the respective factory default conditions for each. Table 6.
ADS1247EVM-PDK Kit Operation www.ti.com 8.1 Installing the ADCPro Software CAUTION Do not connect the ADS1247EVM-PDK before installing the software on a suitable PC. Failure to observe this caution may cause Microsoft Windows to not recognize the ADS1247EVM-PDK as a connected device. The CD-ROM shipped with the ADS1247EVM contains an installer for ADCPro as well as an installer for the ADS1247EVM plug-in. The latest software is available from the TI website at http://www.ti.com/.
ADS1247EVM-PDK Kit Operation 8.2 www.ti.com Setting Up the ADS1247EVM-PDK The ADS1247EVM-PDK contains both the ADS1247EVM and the MMB3 motherboard; however, the devices are shipped unconnected. Follow these steps to set up the ADS1247EVM-PDK. Step 1. Unpack the ADS1247EVM-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.
ADS1247EVM-PDK Kit Operation www.ti.com Step 3. Plug the ADS1247EVM into the MMB3 as Figure 7 illustrates. Figure 7. Connecting ADS1247EVM to MMB3 CAUTION Do not misalign the pins when plugging the ADS1247EVM into the MMB3. Check the pin alignment carefully before applying power to the PDK. Step 4. Set the jumpers and switches on the ADS1247EVM as shown in Figure 3 (note that these settings are the factory-configured settings for the EVM).
ADS1247EVM-PDK Kit Operation 8.2.1 www.ti.com 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.
ADS1247EVM-PDK Kit Operation www.ti.com 8.3 EVM Power Supply The ADS1247EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3 provides 3.3V and ±5V to the ADS1247EVM. 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 ADS1247EVM-PDK is called ADCPro.
ADS1247EVM-PDK Kit Operation space Step 2. www.ti.com Select ADS1247EVM from the EVM drop-down menu. The ADS1247EVM-PDK plug-in appears in the left pane, as shown in Figure 10. Figure 10. ADS1247EVM-PDK Plug-In Display Window Step 3. 14 The ADS1247EVM-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.
ADS1247EVM-PDK Kit Operation www.ti.com space Step 4. 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.
ADS1247EVM-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 will download 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 ADS1247 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.
Evaluating Performance with the ADCPro Software www.ti.com 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 9 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.
Evaluating Performance with the ADCPro Software 9.1.1 www.ti.com I/O Config Tab This tab is the primary tab that controls the function of the multiplexer in the ADS1247. Recall that the ADS1247 multiplexer is configured as shown in Figure 15. By default, all channels are set as analog input; the IDACs are not routed to any channel and the IDAC controls are disabled. These controls are enabled when the correct IDAC settings are made on the Power & Ref tab (see Section 9.1.3).
www.ti.com Evaluating Performance with the ADCPro Software Input pins AIN2-AIN3 can be selected to be an analog input or GPIO. If an input is to be used as a GPIO, check the GPIO box as shown in Figure 16. Figure 16. I/O Config Tab When an input is selected as a GPIO, its label turns green and the IDAC controls for that channel are disabled.
Evaluating Performance with the ADCPro Software www.ti.com Each input channel can also 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 17, using one channel tied to something close to ground (make sure you observe the common-mode restrictions listed in the ADS1247 device data sheet) as a reference for this signal. Figure 17.
www.ti.com 9.1.2 Evaluating Performance with the ADCPro Software GPIO Tab When an input is selected to be a GPIO, its controls are enabled on the GPIO tab, shown in Figure 18. By default, the GPIOs are enabled as inputs. Pressing the Input button reads the state of the enabled inputs; if the input is high, the corresponding light turns green. Figure 18.
Evaluating Performance with the ADCPro Software www.ti.com To make the GPIO an output, the toggle switch can be switched to output mode, as shown in Figure 19. Figure 19.
www.ti.com Evaluating Performance with the ADCPro Software With the GPIO configured as an output, the pushbutton switch controls the state of the output pin. When pressed (as illustrated in Figure 20), the button lights up and the GPIO is set to a high state; when the switch is dark (as Figure 19 shows), the GPIO is in a low state. Figure 20.
Evaluating Performance with the ADCPro Software 9.1.3 www.ti.com Power & Ref Tab The Power & Ref tab is shown in Figure 21. This tab controls the selection of the power-supply mode, reference sources, and IDACs. Figure 21.
www.ti.com Evaluating Performance with the ADCPro Software Note that with the Internal Reference off, the IDAC controls are disabled, because the IDACs cannot be used unless the internal reference is turned on. 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.
Evaluating Performance with the ADCPro Software 9.1.4 www.ti.com Cal Tab The Cal tab (Figure 22) controls the calibration functions of the ADS1247. Figure 22. Cal Tab Pressing the Self Offset Calibrate button causes the ADS1247 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 pressing the Set button.
www.ti.com 9.1.5 Evaluating Performance with the ADCPro Software About Tab The About tab displays information about the EVM and software, as shown in Figure 23. Figure 23. 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 ADS1247 ID register. The Notes indicator may show relevant notes about the plug-in or firmware code, if there are any.
Evaluating Performance with the ADCPro Software 9.1.6 www.ti.com Collecting Data Once you have configured the ADS1247 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 ADS1247EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress bar as shown in Figure 24. Figure 24.
Schematics and Layout www.ti.com 9.2 Troubleshooting If the ADS1247EVM plug-in cannot find the ADS1247EVM-PDK, press the USB RESET button on the MMB3 (refer to Figure 6) and try again. If ADCPro stops responding while the ADS1247EVM-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 ADS1147EVM and ADS1247EVM are appended to this user's guide.
Schematics and Layout www.ti.com Table 7. ADS1147EVM/ADS1247EVM Bill of Materials (continued) 30 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 6 47Ω R3-R7, R10 Resistor, Thick Film Chip 47Ω, 5%, 1/10W, Size = 0603 Panasonic ERJ-3GEYJ470V 27 2 2.7kΩ R8, R9 Resistor, Thick Film Chip 2.
1 2 3 4 5 150nF DVDD 7 1 8 1 2 3 OPA227 C21 10K 2 3 4 C1 1uF 4 U1 VIN TEMP GND VOUT TRIM 6 C4 22uF 5 C5 22uF 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 47 C16 10uF NKK_SS14MDP2 D2 FRC_BAT54 0.1uF U12 R14 0 TP1 AVSS REF5020ID 0.1uF 5 C15 0.
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