Application Note 1672 ISL26134AV28EV1Z Evaluation Board User Guide General Description Features The ISL26134AV28EV1Z provides a means to evaluate the functionality and performance of the ISL26134 A/D converter. • Galvanically-isolated USB communication with PC The board includes an AT90USB162 microcontroller with a USB interface. The microcontroller interfaces to the ISL26134 ADC via a galvanically-isolated interface and provides serial communication via USB between the board and the PC. • On-board voltage reference Software for the PC provides a GUI (graphical user interface) that allows the user to perform data capture, and then to process and plot the results of the time domain analysis, the histogram analysis, and/or the frequency domain analysis on the captured data. The GUI also enables the user to save conversion data from the ADC to a file, or to save the results of the analyzed conversion data. Ordering Information PART NUMBER ISL26134AV28EV1Z DESCRIPTION Evaluation Board • On-board microcontroller • Evaluation software - Time domain analysis - Noise histogram analysis - FFT analysis Hardware The ISL26134AV28EV1Z evaluation board provides the user a means of evaluating the ISL26134 Analog-to-Digital Converter (ADC). The ISL26134 is a high performance 24-bit ADC that includes a very low noise programmable gain amplifier. The ISL26134 offers gain selections of 1x, 2x, 64x and 128x. It offers word rates of 10Sps and 80Sps (clock = 4.9152MHz). Gain and word rate selections are made by pin function control through jumper selections. The board comes with an ISL26134 soldered in place. This can be removed and an ISL26132 soldered in its place. FIGURE 1. IMAGE OF THE EVALUATION BOARD FOR THE ISL26134 November 17, 2014 AN1672.1 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2014. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. Application Note 1672 Evaluation Board Overview The ISL26134AV28EV1Z evaluation board is segmented into two sections. These sections are galvanically isolated with a multichannel isolation chip. The ISL26134 ADC and its associated circuitry (voltage reference and input signal components) are isolated from the microcontroller-USB interface to the PC. The ADC and its associated circuitry are powered by a laboratory supply. The microcontroller with its USB interface is powered from the USB connection. Galvanic isolation is not necessary in every application. The purpose of the isolation is to eliminate noise from the USB ground power connection from affecting the sensitive measurements made by the ADC when used in the 64X or 128X gain settings. The ADC section of the evaluation board has three banana jack power connections. One of these is AGND which serves as the power supply ground connection for the ADC segment of the board. The DVDD jack supplies the digital side of the ADC (3.3V to 5V). The AVDD jack supplies the analog portion of the ADC (5V) and powers the voltage reference. The voltage reference is an Intersil ISL21009BFZ25 2.5V reference. A header is provided to also use an external voltage reference for the ADC. The microcontroller provides the USB interface to the PC. A software GUI is available to communicate with the microcontroller and provides the means to collect and analyze data for the ADC. FIGURE 2. BLOCK DIAGRAM OF THE EVALUATION BOARD FOR THE ISL26134 Submit Document Feedback 2 AN1672.1 November 17, 2014 Application Note 1672 ADC Section The Microcontroller Section The ADC offers different sample rates, gain, and input channel options. These are selected by setting jumpers on headers (1 = positive supply; 0 = ground) as shown in the table on the bottom of Figure 3. Figure 6 illustrates the microcontroller circuitry. There is a reset button provided but it is seldom necessary because the microcontroller has its own power-on reset which will initialize the microcontroller when the USB interface is connected to a powered PC. Power for the microcontroller section comes from the USB interface. The microcontroller circuit includes a DIP switch and some LEDs. The DIP switch is for future use and its switch positions are not meaningful to the current application. The ADC uses a 4.9152MHz crystal operating with an on-chip amplifier for its clock source. This can be disconnected and an external clock can be sourced to drive the clock input to the chip. Alternately, the XTALIN/CLOCK pin can be grounded and the ADC will operate from an on-chip RC type oscillator. The board provides a 2.5V reference IC as the voltage reference for the ADC, or an external voltage can be connected to a terminal block and selected through jumpers on headers J28 and J30 as shown in Figure 5. These headers also provide the option of selecting AVDD and AGND as the inputs to VREF+ and VREFon the ADC. The evaluation board provides separate terminal connections for each of the differential signals into the ADC. These terminals are in shown in Figure 4. Be attentive of the labeling of the connections and their polarities when connecting external signals. The channel numbers on the terminal blocks are not in numeric order and some have their polarities labeled opposite of others. Header connector J22 in Figure 4 allows the user to select one of the following options for the common mode voltage; the 2.5V voltage reference output, ground (AGND), a voltage generated by a resistor divider that divides the AVDD supply using two 1kΩ resistors, or to an voltage determined by the user which must be connected to the hole next to the header connection labeled FLT (Floating Input). The microcontroller circuit includes a header through which the flash memory on the microcontroller is programmed. A second header provides a means for the user to monitor the signals (SCLK and SDO/RDYb — on the J22 header these are labeled as MOSI and MISO [Master Out, Slave In and Master In, Slave Out] respectively) from the microcontroller that communicate with the ADC. One LED lights up to indicate when power is applied to the USB interface. A second LED indicates when the microcontroller is available to collect data from the ADC. The microcontroller communicates with the ADC via the galvanic isolator chip. The microcontroller side of the isolator is powered by the voltage from the USB connection. The USB connection can be powered or unpowered without regard to the supplies to the ADC side of the board. There is no power sequence requirement between the two sections of the board. Each of the input channels has jumpers to allow the user to connect the common mode voltage to either the AIN+ or the AINinput. This enables the external circuit to be biased to a common mode value supplied by the board. If both jumpers are put in place, the inputs will be shorted to the common mode voltage. This provides a means for testing the noise performance of the ADC with its inputs shorted. The ADC interfaces to the microcontroller through the galvanic isolators. The ADC side of the isolator chip is powered by the same supply that powers the DVDD supply of the ADC. Power from an external supply must be provided to the DVDD (3.3V to 5V), AVDD (5V) and AGND banana plug connectors for the ADC portion of the board to function. LEDs will be illuminated by DVDD and AVDD when they are powered. Note that these supplies can be applied and removed without regard to whether the USB interface is connected and powered or not. Submit Document Feedback 3 AN1672.1 November 17, 2014 DVDD AVDD R4 R1 200 J4 SMA R3 NO-POP 4 1 AGND XTALIN/CLOCK XTALOUT VREF+ VREF- 20 19 VREF+ VREF- AIN1+ AIN1- 11 12 AIN1+ AIN1- AIN2+ AIN2- 18 17 AIN2+ AIN2- AIN3+ AIN3- 13 14 AIN3+ AIN3- AIN4+ AIN4- 16 15 AIN4+ AIN4- ISL26134 A1 A0 SPEED SCLK GAIN1 SDO/RDY GAIN0 3 1 J5 A1 A0 3 3 AGND AGND 7 AGND U2 AGND 8 16 A0 25 27 24 28 23 SCLK OUT1 SDO/RDY OUT3 GAIN0 A1 A2 A3 A4 EN2/NC 9 15 GND2 GND2 DVDD VDD1 VDD2 14 13 B1 12 B2 11 B3 B4 10 EN1/NC GND1 GND1 1 3 4 5 6 SCLK R36 7 2 8 DVDD DGND DVDD SI8441BB AGND R9 10k J7 2 C13 X7R 2700pF AGND J29 1 J3 AGND DGND AGND A1 26 C8 X7R 0.1µF C6 X7R 0.1µF SPEED Y1 4.9152MHz 4 6 DGND DGND 5 2 AGND 21 J6 2 2 GAIN1 PWDN U1 ISL26134 1 J1 2 CAP DVDD USB_5V 3 10 DVDD RED D1 RED D2 DVDD 1 AVDD CAP AVDD AGND DVDD AGND DVDD J19 1 2 GAIN1 3 PWDN GAIN0 3 HDR2X1 AGND A0 AGND AGND A1 CHANNEL GAIN0 GAIN1 GAIN SPEED AN1672.1 November 17, 2014 0 0 AIN1 0 0 1 0 10 1 0 AIN2 1 0 2 1 80 0 1 AIN3 0 1 64 1 1 AIN4 1 1 128 FIGURE 3. ADC WITH POWER SUPPLY CONNECTIONS, JUMPER SELECTIONS, AND ISOLATOR INTERFACE DGND 1k MISO Application Note 1672 C10 NO-POP 0.1µF DVDD J21 DVDD AGND AGND AGND 9 AVDD J23 C12 X7R 0.1µF AGND C1 POLY 0.10µF 200 R2 200 C11 X7R 0.1µF AVDD AGND DVDD 22 Submit Document Feedback Schematics Submit Document Feedback Schematics (Continued) AIN1+ C3 X7R 0.01µF 2 AIN1+ 1 AIN1- J9 HDR2X1 C2 X7R 4700pF J8 CMB J10 HDR2X1 AGND AIN1C4 X7R 0.01µF 5 AGND AIN3+ J15 C15 HDR2X1 X7R 0.01µF 2 AIN3+ C14 X7R 4700pF J14 CMB J16 HDR2X1 AGND AIN3C16 X7R 0.01µF AGND AIN4C18 X7R 0.01µF 2 AIN4- 1 AIN4+ J18 HDR2X1 C17 X7R 4700pF J17 AVDD CMB AGND J20 HDR2X1 AIN4+ C19 X7R 0.01µF CMB AGND J22 HDR4X2 1 2 2.5V 3 4 GND 5 6 RDIV 7 8 2 AIN2- 1 AIN2+ J11 C5 X7R 4700pF 2.5V_VREF FLT R20 1k AIN2J12 C7 HDR2X1 X7R 0.01µF R19 1k AGND CMB AGND J13 HDR2X1 AGND AIN2+ AN1672.1 November 17, 2014 C9 X7R 0.01µF AGND FIGURE 4. ANALOG INPUTS AND COMMON MODE SELECTION SELECTIONS Application Note 1672 1 AIN3- Submit Document Feedback Schematics (Continued) AVDD J28 HDR3X2 AVDD 1 2 VREF+ 3 4 2.5V 5 6 R12 10 VREF+ 2.5V_VREF 2 VREF+ 6 C28 X7R 0.1µF 1 VREFJ24 GND VREFGND R13 10 AGND U6 AGND C20 X7R 1µF 1 2 3 4 GND_OR_NC VIN DNC GND ISL21009BFB825 2.500V AGND DNC DNC VOUT TRIM 8 7 6 5 2.5V_VREF C21 X7R 0.1µF AGND FIGURE 5. VOLTAGE REFERENCE AND VOLTAGE REFERENCE SELECTION OPTIONS VREF- Application Note 1672 AVDD J30 HDR3X2 1 2 3 4 5 6 C29 NO-POP 47µF AN1672.1 November 17, 2014 Submit Document Feedback Schematics (Continued) SCLK 3 MOSI MISO CS USB_5V USB_5V J26 HDR4X2 1 2 J27 HDR3X2 4 5 6 MISO 7 8 SCLK RESET 1 2 3 4 5 6 MOSI DGND C27 C25 X7R X7R X7R 0.01µF 0.1µF 0.1µF C26 DGND USB_5V USB_5V 7 DGND R11 47k LED3 RESET LED2 LED1 RESET 3 2 4 S1 U3 DGND USB_5V 24 22 RESET PC7(INT4/ICP1/CLKO) PC6(OC.1A/PCINT8) 4 32 27 USB_5V VBUS PC5(PCINT9/OC.1B) VCC PC4(PCINT10) AVCC PC2(PCINT11) C24 X7R 1µF PD0(OC.0B/INT0) PD1(AIN0/INT1) PD3(TXD1/INT3) FB1 PD4(INT5) J25 PWR DD+ USB GND CASE CASE PD5(XCK/PCINT12) DGND 22 R5 29 2 22 R10 3 30 31 4 28 PD6(RTS/INT6) D+/SCK PD7(CTS/HWB/T0/INT7) 2 8.000MHz 3 C22 AN1672.1 November 17, 2014 DGND DGND COG 22pF 22pF DGND PC5 PC4 PC2 6 7 8 9 PD3 4 5 11 3 6 12 2 7 13 1 8 10 UGND PB0(SS/PCINT0) PB2(PDI/MOSI/PCINT2) XTAL1 PB3(PDO/MISO/PCINT3) PB4(T1/PCINT4) PB5(PCINT5) XTAL2 PB6(PCINT6) GND PB7(PCINT7/OC.0A/OC.1C) 14 SW4 SW3 SW2 SW1 SCLK 16 MOSI 17 MISO 18 19 20 21 AT90USB162-16AU DGND FIGURE 6. MICROCONTROLLER WITH USB INTERFACE SW-DIP4 PB0 15 C23 COG PC6 S2 PB1(SCLK/PCINT1) 1 PC7 UVCC 6 Y2 5 R8 200 D-/SDATA 5 USB-B 26 R7 200 UCAP PD2(RXD1/AIN1/INT2) 1 23 25 R6 200 CS PB5 PB6 PB7 DGND Application Note 1672 1 Application Note 1672 Software The evaluation board has GUI software available that runs on the PC. ISL26134AV28EVZ1 evaluation boards manufactured before June, 2014, use different uC code (Version 5) and a different PC GUI (Version 1.1). Boards manufactured after June, 2014, use uC code Version 7 and PC GUI Version 3. The software (uC code Version 7 and PC GUI Version 3) is designed to operate under Windows XP or later, including WIN8. Read “Appendix #1 How to Obtain and Install the GUI Software” on page 19 to obtain the internet link to download the GUI software. Once the PC GUI software is copied onto the PC, click on the isl261xx_installer_v3.exe file and follow the on screen instructions to load the software. Note that the software uses the USB interface to communicate with the evaluation board. The software uses the USB HID driver that is part of the Windows operating system so it is not necessary to load any other drivers for the USB interface. Running the GUI Before starting the GUI software, the evaluation board should be connected to the PC by means of a USB cable. With the board connected via USB, run the GUI program by selecting Start → All Programs → Intersil → ISL261XX → ISL261XX Evaluation Software. If the software is started before the connection to the board is made, the GUI will output a message (USB Status: Not Connected) as shown in Figure 7. If this occurs, connect the evaluation board to the PC with the USB cable. The message should automatically change as shown in Figure 8. Using the GUI Software When the GUI software is started and the USB connection is established, the GUI will present a menu as shown in Figure 8. The Initialize button is colored red to indicate that it is waiting for a part number to be chosen in the Device Selection window. The user must pick a part number from the Device Selection Window and click on the Initialize button. This causes the software GUI to be configured to support the selected device. The ISL2613X number represents the ISL26132 or ISL26134. Once the Initialize button is clicked with the ISL2613X selection, the screen will change slightly to indicate the output word rate options of the ISL2613X ADC. Note that the actual word rate used by the ADC is selected by a jumper on the evaluation board. The selection here in the Sample Frequency window only tells the GUI software which sample rate is to be used for the frequency axis when graphing the spectrum for the spectral (FFT) plot. The top line of the menu page has two options, File and About. The File selection will be discussed after the Time Domain, Histogram and Frequency Domain windows are selected. When the GUI is started it sends a command to the evaluation board and tells the microcontroller to send back the version of the code that is in the microcontroller. If About is selected, the GUI will open a window that indicates the version number of the microcontroller code, and the version of the GUI software, as shown in Figure 10. FIGURE 7. Submit Document Feedback 8 AN1672.1 November 17, 2014 Application Note 1672 FIGURE 8. FIGURE 9. FIGURE 10. Submit Document Feedback 9 AN1672.1 November 17, 2014 Application Note 1672 Time Domain Window The Time Domain window allows the user to collect samples from the ADC on the evaluation board and display them in the time domain. The number of samples is initially defaulted at 64, but can be set in a pull-down window from 1 to 1048576. Realize the time involved if a large number of samples is requested on an ADC with a slow sample rate. When the Acquire button is clicked, the samples will be collected and the samples up to 256 will be displayed in the graphing window. If greater than 256 samples are collected, then, after the samples are captured and the first 256 are displayed, the time plot of the entire sample set can be displayed by clicking on the Pop Out button. Figures 11 and 13 illustrate the capture of 4096 samples. The window in Figure 11 displays only the first 256 samples. Figure 13 illustrates the results when the Pop Out button has been selected. FIGURE 11. Submit Document Feedback 10 AN1672.1 November 17, 2014 Application Note 1672 Buttons at the top of the plot provide several user graph tool functions as shown in Figure 12. Check Box: Allows customization of axis labels/plot title as shown in the Figure 13. These are also available in the Histogram and Frequency Domain windows. Disk: Saves the plot as an image. When selected, a window will open that offers several image format options. House: Zooms to the original zoom scale factor. Once the data from the ADC has been captured, the data can be saved to a file. The histogram data and the spectrum data can also be saved. See “Appendix #2 Data File Formats” on page 19 for a discussion of the formats of the saved files. Note that the raw data (conversion words from the ADC) files can also be read back into the GUI once saved or, data collected from another source can be read into the GUI software for analysis if the proper data format is used. See “Appendix #2 Data File Formats” for details. Left/Right: Goes back/forward 1 zoom command. So if you zoom in twice and want to go back to the first zoom, you’d click the left arrow. Four Points: Moves the axes around. Magnifying Glass: Zoom box. Scaling Icon (Up/down/left/right): Changes the size of the plot in the window. You can scale the graph as large as the border. FIGURE 12. FIGURE 13. Submit Document Feedback 11 AN1672.1 November 17, 2014 Application Note 1672 FIGURE 14. Submit Document Feedback 12 AN1672.1 November 17, 2014 Application Note 1672 Histogram Window codes that are counted in one bin of the histogram. This number is defaulted to “1”. If one clicks on the histogram window after collecting data using the Time Domain window, the histogram of the time domain data will be plotted. Alternatively, the Histogram window provides the user options to set the number of samples to be collected and to acquire a new sample set based upon this selection. The Bin Width window allows the user to set the number of converter When the histogram is plotted, the plot includes markers for the mean value (red vertical line) and for one standard deviation from the mean on each side (green dashed lines). Signal statistics are listed in the plot itself and in the text boxes below the graph. The Pop Out button shows the graph without the statistics listed. FIGURE 15. Submit Document Feedback 13 AN1672.1 November 17, 2014 Application Note 1672 Frequency Domain If the user has collected data in either the Time Domain window or the Histogram window, and then clicks on the Frequency Domain menu option, the data will be processed with the FFT algorithm and the resulting spectral information will be displayed, as shown in Figure 16. The red lines mark harmonics. If no signal is present, the software assumes the highest point in the spectrum is the fundamental. If the log(freq) check box is checked, the spectral plot will be graphed with the frequency axis on a Log scale, as shown in Figure 19. If the Grounded Input Test check box is checked, and data is collected with the input to the converter shorted, the GUI software will calculate the various parameters such as SNR (signal-to-noise ratio) by computing the ratio of an artificial full-scale sine wave to the total noise in the bandwidth. The Grounded Input Test check box should only be checked if there is no actual signal input into the converter. Note that if the Grounded Input Test check box is not checked, the software will compute parameters such as SNR, by calculating the ratio of the largest magnitude component in the spectrum (other than the DC offset) to the noise. FIGURE 16. Submit Document Feedback 14 AN1672.1 November 17, 2014 Application Note 1672 There are several different selectable options in the Frequency Domain window. The number of samples can be set up to 1048576 using a pull down menu as shown in Figure 17. Note that the Frequency Domain software must have at least 1024 samples to compute a proper spectral plot. The software also allows a number of different window functions to be used. The different windowing options can be selected in the Windowing pull-down menu as shown in Figure 18. These are normally used when testing is performed with a sine wave as the input signal. This same software GUI supports other ADC platforms (high speed SAR ADCs) where these windowing options are more commonly used. Figure 19 illustrates the spectral plot of one data set of 4096 samples. The results of the FFT can be averaged by setting the Mode radio button option to Ave. and then using the window next to the “Ave.” button to set the number of data sets to be averaged. When averaging is performed, the output results of many FFTs are averaged and produce a spectral plot with smoothed (averaged) spectrum as shown in Figure 20. Recall that the spectrum plot data can be saved by clicking on the File → Save → Spectrum Data option at the top of the window. FIGURE 17. FIGURE 18. Submit Document Feedback 15 AN1672.1 November 17, 2014 Application Note 1672 FIGURE 19. Submit Document Feedback 16 AN1672.1 November 17, 2014 Application Note 1672 FIGURE 20. Submit Document Feedback 17 AN1672.1 November 17, 2014 Application Note 1672 ISL26134AV28EV1Z Bill of Materials ITEM QTY REFERENCE PART NUMBER MANUFACTURER DESCRIPTION 1 1 C1 ECH-U1C104JX5 PANASONIC CAP, 0.10µF, 5%, PPS FILM, 1210 2 4 C2, C5, C14, C17 C0805C472J5RAC KEMET CAP, 4700pF, X7R, 0805, 50V, 5% 3 9 C3, C4, C7, C9, C15, C16, C18, C19, C27 C0805C103J5RAC KEMET CAP, 0.01µF, X7R, 0805, 50V, 5% 4 9 KEMET CAP, 0.1µF, X7R, 0603, 25V, 5% 5 1 C13 C0603C272J5RAC KEMET CAP, 2700pF, X7R, 0603, 50V, 5% 6 1 C20 C0603C105K4RACTU KEMET CAP, 1µF, X7R, 0603, 16V, 10% 7 2 C22, C23 C0603C220J5GAC KEMET CAP, 22pF, COG, 0603, 50V, 5% 8 1 C24 C0805C105J4RAC KEMET CAP, 1µF, X7R, 0805, 16V, 5% C6, C8, C10, C11, C12, C0603C104J3RACTU C21, C25, C26, C28 9 1 C29 C1210C476M9RACTU KEMET CAP, 47µF, 20%, 6,3V, X7R, 1210 10 5 D1, D2, LED1, LED2, LED3 SML-LX1206IC-TCR LUMEX OPTO LED, SMT 3216 , RED 11 1 FB1 MI0805M221R-10 LAIRD - SIGNAL INTEGRITY FERRITE CHIP POWER 220 OHM SMD 12 5 J1, J5, J6, J7, J29 TSW-103-07-G-S SAMTEC STAKE HEADER, 3x1, 0.1" CTR, GOLD 13 9 J3, J9, J10, J12, J13, J15, J16, J18, J20 TSW-102-07-G-S SAMTEC STAKE HEADER, 2x1, 0.1" CTR, GOLD 5-1814832-1 TYCO CONNECTOR, SMA, GOLD PLATED 1729128 PHOENIX CONTACT CONN TERM BLOCK 2POS 5.08MM 111-2223-001 EMMERSON BINDING POST, GROUNDED TYPE NICKEL PLATED TSW-104-07-G-D SAMTEC STAKE HEADER, 4x2, 0.1" CTR, GOLD 67068-9000 MOLEX CONN USB RT ANG RECPT TYPE B WHT 14 1 J4 15 5 J8, J11, J14, J17, J24 16 3 J19, J21, J23 17 2 J22, J26 18 1 J25 19 3 20 6 21 1 R3 22 2 R5, R10 J27, J28, J30 TSW-103-07-G-D SAMTEC STAKE HEADER, 3x2, 01." CTR, GOLD DALE RES, 200Ω, 0805, 1/10W, 1%. 100ppm NP-RES-0805 N/A DO NOT POPULATE CRCW0805220J DALE RES, 22Ω, 0805, 1/10W, 5%, 200ppm R1, R2, R4, R6, R7, R8 CRCW08052000F 23 1 R9 CRCW0805103J VISHAY RES, 10k, 0805, 1/10W, 5%. 200ppm 24 1 R11 CRCW0805473J DALE RES, 47k, 0805, 1/10W, 5%, 200ppm CRCW0805100J VISHAY RES, 10Ω, 0805, 1/10W, 5%. 200ppm CRCW08051001F DALE RES, 1k, 0805, 1/10W, 1%. 100ppm 25 2 R12, R13 26 3 R19, R20, R36 27 1 S1 B3F-1000 OMRON SWITCH. PUSHBUTTON SPST 6x6mm 28 1 S2 5435640-2 TYCO SWITCH DIP 4POS UNSEALED GOLD 29 1 U1 ISL26134AV28 INTERSIL PRECISION ADC, TSSOP28 PKG 30 1 U2 SI8441BB SILICON LABS DIGITAL ISOLATOR, QUAD CHANNEL, SOIC16 WIDE BODY PKG 31 1 U3 AT90USB162-16AU ATMEL MICROCONTROLLER, USB CONTROLLER, 8-BIT, 16k FLASH, TQFN32 PKG 32 1 U6 ISL21009BFB825 INTERSIL VOLTAGE REFERENCE, 2.5V, ±0.5%, 3ppm, SOIC8 33 1 Y1 CMR309T-4.9152MABJ-UT CITIZEN CRYSTAL, 4.9152MHz, TUBULAR, MINIATURE 34 1 Y2 CMR309T-8.000MABJ-UT CITIZEN CRYSTAL, 8.000MHz, TUBULAR, MINIATURE 35 12 881545-2 TE CONNECTIVITY SHUNT, LP W/HANDLE, 2 POS, 30AU 36 1 UB 12-03 SF CABLES CABLE, USB 2.0 A MALE TO B MALE, 3FT Submit Document Feedback 18 NOTES INSTALL AFTER WASH PROCESS AN1672.1 November 17, 2014 Application Note 1672 Appendix #1 How to Obtain and Install the GUI Software The following is the address for the ISL26134 product page on the Intersil web site. http://www.intersil.com/products/ISL26134 Go to this link to find the tab where the PC GUI software installer can be downloaded. Note that the software installer does have a license agreement that will be presented when the software is loaded onto your PC. Appendix #2 Data File Formats The GUI software allows the user to save data from the time domain (raw data), data from the histogram processing, and data from the spectrum processing segments of the software. It also allows raw data (time domain data) files to be read back into the GUI if they have the proper header and format. Raw Data As an example, a time domain collection of only 8 samples has been collected and saved to a file. The content of the file that is saved has the following format: ISL2613X 80.0 24 8 -394 -361 -405 -411 -397 -416 -423 -416 0 0 4 4 7 15 29 47 54 79 84 96 112 107 99 87 71 57 40 14 11 2 3 1 0 Spectrum Data A data set of 1024 points was collected at a sample rate of 80Sps. The FFT output will produce a spectrum plot with 512 Bins of magnitude data. Only the beginning and ending portion of the data file has been reproduced here. Note that the Bins start at 0 frequency and increase to one half the sample rate (40Hz). Note that the magnitude in dB is the magnitude of the noise in dB below full-scale rms but it is scaled based upon magnitude/ √BIN, not magnitude/√Hz. The file has a header that consist of the part number (ISL26134), the sample rate (80), the number of bits in the conversion word (24), and the number of samples in the file (8). The header is followed by the 8 conversions words in signed decimal format. Histogram Data A data collection of 1024 data words was collected and the histogram performed. The histogram data was then saved into a file. The content of the file has the following format. The histogram statistics are listed first, followed by the converter codes and their respective histogram counts. Signal Statistics Min: -486 Max: -462 Range: 25 Mean: -472.762 StDv: 3.631 Code -488 -487 -486 -485 -484 -483 -482 -481 -480 -479 -478 -477 -476 -475 -474 -473 -472 -471 -470 -469 -468 -467 -466 -465 -464 -463 -462 -461 Freq Magnitude (dB) 0.0 -152.176082921 0.078125 -150.765450438 0.15625 -151.161495054 0.234375 -161.302103964 0.3125 -152.403880548 0.390625 -153.371854853 0.46875 -147.933929413 0.546875 -140.814871676 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 39.375 -158.163736345 39.453125 -186.035243892 39.53125 -162.574730282 39.609375 -161.238997758 39.6875 -160.482611598 39.765625 -157.776276313 39.84375 -156.626469649 39.921875 -158.855304029 All Data (Excel) The advantage of saving data with this option is that the raw data, the histogram data, and the spectrum data will all be saved on separate sheets of the spreadsheet, but the version of Excel that is supported only allows up to 32k samples. Hits 0 0 1 Submit Document Feedback 19 AN1672.1 November 17, 2014 Application Note 1672 Load Data Function The GUI allows raw (time domain) data to be loaded back into the GUI. Alternately, the user might collect data in another system and import the conversion word data into the GUI to perform analysis. To be able to read the data the file must have the proper header (as discussed in “Raw Data” on page 19 of this appendix). The header must have a header with a part number (this can be something other than a chip number), sample rate, number of bits in the converter, and the number of samples, followed by the data in decimal format. The largest value of any reading cannot exceed one half 2n (n = number of bits in the converter). For example, if the number of bits in the converter is 12, then the largest reading can be no greater than (212)/2 or 2048. ISL2613X 80.0 24 8 -394 format -361 -405 -411 -397 -416 -423 -416 > > > > > part number sample rate number of bits in the converter number of data samples in the file conversion data in signed decimal Appendix #3 Evaluation Board Factory Jumper Settings The photograph in Figure 21 indicates the position of the header shunts when the board is shipped from the factory. Header J22 is connected with the 2.5V reference selected as the common mode voltage. Headers J9 and J10 are shorted with shunts to connect the common mode voltage to the AIN1+ and AIN1- signals coming from the terminal block connector. This effectively shorts both inputs to channel 1 on the ADC to the common mode voltage and enables the ADC to be tested with a shorted input. One or both of these jumpers must be removed if the ADC is to measure a signal on this channel. Headers J1 and J5: these are set to select logic 1, A0 = A1 = 0 => Channel = 1. Headers J 29 and J7: These are set to select logic 1, Gain0 = Gain1 = 1 => => Gain = 128X. Header J6: Set to select logic 1. Speed = 1 => 80Sps. Headers J28 and J30: the 2.5V_VREF option is selected on J28. The AGND option is selected on J30. These enable to 2.5V voltage reference chip to be the voltage reference for the ADC. DIP switch: Switches S2-1, S2-2, S2-3 and S2-4 cannot be in the closed (ON) position. With all four switches in this position the board is in a factory test mode and will not function properly with the PC software GUI. If the factory test mode is selected LED3 will be lighted. FIGURE 21. Submit Document Feedback 20 AN1672.1 November 17, 2014 Application Note 1672 Appendix #4 Evaluation Board Layout and Component Placement FIGURE 22. TOP LAYER FIGURE 23. BOTTOM LAYER Submit Document Feedback 21 AN1672.1 November 17, 2014 Application Note 1672 Appendix #4 Evaluation Board Layout and Component Placement (Continued) FIGURE 24. COMPOSITE OF LAYERS Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com Submit Document Feedback 22 AN1672.1 November 17, 2014