PLC Demo System User Guide UG-181 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 PLC Demo System, Industrial Process Control Demo System FEATURES EMC performance tested Inputs selectable: 0 mA to 20 mA, 4 mA to 20 mA, 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, RTD, TC Outputs programmable: 0 mA to 20 mA, 0 mA to 24 mA, 4 mA to 20 mA, 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V Four isolated 24-bit analog input channels AD7793 24-bit sigma-delta (Σ-Δ) ADC, 40 nV noise AD8220 instrumentation amplifier, >80 dB CMRR ADuM5401 isoPower® integrated, isolated dc-to-dc converter, 500 mW output power ADR441 precision 2.5 V reference 4 isolated 16-bit analog output channels AD5422 single-channel, 16-bit, serial input, current source and voltage output DAC 0.01% typical total unadjusted error (TUE) Single chip solution Output fault detection and protection Power/interface/control Analog Devices, Inc., ARM7 ADuC7027 ADP1715 500 mA low-dropout CMOS linear regulator ADM3251E isolated single-channel RS-232 line driver/receiver board contains four fully isolated ADC channels, a microprocessor with RS-232 interface and four fully isolated DAC output channels. Input ranges are hardware programmable and include 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 4 mA to 20 mA, 0 mA to 20 mA, ±20 mA, thermocouple and RTD. Output ranges are software programmable and include 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 4 mA to 20 mA, 0 mA to 20 mA, and 0 mA to 24 mA. The PLC demo system features the AD5422 (a single-chip 16-bit DAC solution with ±0.05% TUE) and AD7793 (low noise, low power, 24-bit Σ-Δ ADC). Isolation is achieved using the ADuM5401 (quad-channel isolator with integrated dc-todc converter), ADuM1401 (quad-channel isolator), or ADM3251E (fully isolated RS-232 transceiver). Input signal conditioning is performed by the AD8220 (>80 dB CMRR, JFET in-amp). Voltage references include the ADR441, ADR445 (ultralow noise, XFET® voltage reference), and ADP1720 (50 mA, high voltage, micropower linear regulator). Communications with the ADC and DAC channels take place using the ADuC7027 microcontroller, which can be connected to a PC via an isolated RS-232 interface. ANALOG SIGNALS APPLICATIONS VOLTAGE INPUTS (FLOW, PRESSURE) • 0V TO 5V, 0V TO 10V • ±5V, ±10V GENERAL DESCRIPTION Figure 2. PLC Demo Board Rev. 0 | Page 1 of 16 VOLTAGE OUTPUTS • 0V TO 5V, 0V TO 10V • ±5V, ±10V CURRENT OUTPUTS • 0mA TO 20mA • 0mA TO 24mA • 4mA TO 20mA Figure 1. PLC System Level Diagram 09257-002 The PLC demonstration system is aimed at demonstrating the value Analog Devices parts can add to a PLC system. The demo CURRENT INPUTS (COMMUNICATIONS) • 0mA TO 20mA • 4mA TO 20mA PLC MODULE BOARD 09257-001 Process control Transmitters Actuator control PLC/DCS systems PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. ANALOG OUTPUTS SENSOR INPUTS • RTD • TC • GAS UG-181 PLC Demo System User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Power Supplies ...............................................................................6 Applications ....................................................................................... 1 RS-232 Communications .............................................................6 General Description ......................................................................... 1 Demo System Software .....................................................................7 Revision History ............................................................................... 2 Software Installation .....................................................................7 PLC Total Solution Diagram ........................................................... 3 Software Operation .......................................................................7 Demo Systems Hardware................................................................. 4 Firmware.........................................................................................9 Inputs ............................................................................................. 4 EMC Test Results ............................................................................ 10 Outputs .......................................................................................... 5 Simplified Input/Output circuit Diagrams ................................. 11 REVISION HISTORY 8/10—Revision 0: Initial Version Rev. 0 | Page 2 of 16 PLC Demo System User Guide UG-181 PLC TOTAL SOLUTION DIAGRAM V/I INPUTS, BIPOLAR SUPPLY, HIGH PERFORMANCE 5V ADP1720 IOUT1 2.5V (>30mA) 5V AD7793 AD8220 ±15V ISOLATED DC-TO-DC IOUT2 24V ISO DC-TO-DC ADP1715 ADR441 24V ADuM1401 ADR445 AD5422 3.3V ISOLATED SPI ADuM1401 DAC V/I INPUTS, SINGLE SUPPLY, LOWER COST SPI ADR441 IOUT1 2.5V 5V ADuM5401 5V ISOLATED TX/RX IOUT RANGE SCALE 4mA TO 20mA, 0mA TO 24mA VOUT RANGE SCALE 0V TO 5V, 0V TO 10V, ±5V, ±10V (>30mA) ADuC7027 IOUT2 OPEN DETECT OVERTEMP DETECT ISOLATED AD7793 AD8220 ±15V ISOLATED DC-TO-DC ADM3251E ISOLATED RS-232 5V ±15V ISOLATED DC-TO-DC AD5422 3.3V ADuM1401 DAC SPI ISOLATED Figure 3. PLC Block Diagram Rev. 0 | Page 3 of 16 OPEN DETECT IOUT RANGE SCALE 4mA TO 20mA, 0mA TO 24mA VOUT RANGE SCALE 0V TO 5V, 0V TO 10V, ±5V, ±10V OVERTEMP DETECT 09257-003 ±15V UG-181 PLC Demo System User Guide DEMO SYSTEMS HARDWARE Figure 4 shows the locations of the various functional blocks of the PLC demo system. OUTPUT 4 OUTPUT 3 INPUT 4 Input Connectors Each input channel contains three sets of connectors; Jx1 connectors for voltage and current inputs, Jx2 connectors for thermocouple inputs, and Jx3 for RTD inputs (see Figure 6). Although all the channels allow for all three input types, the PLC demo software limits the inputs as described in Table 2. – OUTPUT 2 VOLTAGE AND CURRENT INPUTS 0V TO 5V, 0V TO 10V, ±5V, ±10V 0mA TO 20mA, 4mA TO 20mA, ±20mA + Jx1 INPUT 3 OUTPUT 1 INPUT 2 INPUT 1 THERMOCOUPLE INPUT + 09257-004 Jx2 – Figure 4. Channel Locations IOUT2 2 3 4 3-WIRE RTD INPUT REF Figure 6. Input Connectors Table 2. Ranges Allowed in PLC Demo Software Input Channel 1 2 3 4 ON 1 IOUT1 09257-006 DIP switches on the PLC demo board must be set to configure each input channel to the required input range. These switches are found to the left of each input channel’s circuitry. Figure 5 shows a diagram of these switches, and Table 1 lists the required switch configurations for each input range. Jx3 INPUTS Input Type JA1—voltage and current (unipolar) JB2—thermocouple JC1—voltage and current (bipolar) JD3—RTD 5 6 Voltage and Current 7 The JA1 and JC1 connectors allow for various signaling inputs (see Figure 6). JA1 (Channel 1) allows for single-ended unipolar inputs: 0 V to 5 V, 0 V to 10 V, 4 mA to 20 mA, and 0 mA to 20 mA. Figure 20 shows a circuit diagram of this input. JC1 (Channel 3) allows for differential inputs: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 4 mA to 20 mA, 0 mA to 20 mA, and ±20 mA. Figure 21 shows a circuit diagram of this input. To set the input range switches, see Table 1. 09257-005 8 Figure 5. Input Channel Switches Table 1. Input Channel Switch Settings Switch No. 1 2 3 4 5 6 7 8 Range 0 V to 5 V, 0 V to 10 V, ±5 V ±10 V On Off Off Off Off Off On On On On On On Off Off Off Off Current On Off On On On On Off Off Thermocouple Off Off Off Off Off Off On On RTD Off Off Off Off Off Off Off Off The 250 Ω current sensing resistor on the input channels has a 25 ppm/°C drift specification. The user can observe the drift from this resistor and can chose to replace this with a lower drift resistor if greater performance is desired. Rev. 0 | Page 4 of 16 PLC Demo System User Guide UG-181 Thermocouple OUTPUTS JB2 (Channel 2) is for thermocouple inputs (see Figure 6). Figure 22 shows a circuit diagram of this input. The PLC software allows the user to connect many different thermocouple types including J-, K-, and T-types. To set the input range switches for thermocouple inputs, see Table 1. Each output channel contains both a current and a voltage output connector. The relevant connectors are +VOUT/GND and IOUT/GND (Figure 9). The available output ranges are 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, 4 mA to 20 mA, 0 mA to 20 mA, and 0 mA to 24 mA. On each channel, either the voltage or the current output can be enabled. The output that is not in use is tristated. If neither channel is enabled both are tristated. Figure 24 shows a circuit diagram of the output channels. 09257-007 OPTIONAL 32V INPUT TO INCREASE THE VOLTAGE COMPLIANCE LIMIT ON THE CURRENT OUTPUT +32VDC GND VOLTAGE OUTPUT 0V TO 5V, 0V TO 10V, ±5V, ±10V +VOUT CURRENT OUTPUT 0mA TO 20mA, 4mA TO 20mA, 0mA TO 24mA IOUT GND GND 09257-009 The PLC demo system hardware comes with a T-type thermocouple. Figure 7 shows how to connect this thermocouple to the PLC demo board. Figure 9. Output Connectors Increasing the Output Compliance Figure 7. Thermocouple Connector RTD JD3 (Channel 4) is for 3-wire RTD inputs (see Figure 6). Figure 23 shows a circuit diagram for these inputs. To set the input range switches for 3-wire RTD inputs, see Table 1. The PLC demo system hardware comes with a PT1000 RTD temperature sensor. Figure 8 shows how to connect this RTD to the PLC demo board. The voltage compliance limit on the current output is 12.5 V. A connector is available to externally provide 32 V dc, which increases the output compliance to 29.5 V. The relevant connectors are labeled +32VDC and GND (see Figure 9). Figure 10 shows how +32VDC is connected to the channel supply of the AD5422. There is a 20 V TVS on the IOUT, which may need to be changed/removed if an external supply is used. +32VDC +15V ISO GND –15V ISO VDD AD5422 VOUT IOUT IOUT GND 09257-010 VSS 09257-008 Figure 10. +32VDC Connection on the Output Channels Figure 8. RTD Connection Rev. 0 | Page 5 of 16 UG-181 PLC Demo System User Guide POWER SUPPLIES RS-232 COMMUNICATIONS The PLC demo system uses an RS-232 straight through DB-9 connector. This connector is supplied with the PLC demo system board. The RS-232 signal can be connected straight to the RS-232 port of the PC. If the PC being used does not have an RS-232 port, a RS-232-to-USB converter can be used. +24VDC 09257-011 COM The RS-232 connection between the PLC demo board and PC is fully isolated using the ADM3251E isolated single-channel RS-232 line driver/receiver. Figure 11. Power Connections The demo board should be powered by a 24 V dc, ±10%, 500 mA supply. This should be connected via the +24VDC INPUT (JP2) socket. All other supplies on the PLC demo board are derived from this 24 V dc supply. Rev. 0 | Page 6 of 16 PLC Demo System User Guide UG-181 DEMO SYSTEM SOFTWARE SOFTWARE INSTALLATION The demonstration kit includes self-installing software. The software is compatible with Windows® 2000 and Windows XP. Run the setup.exe file to begin the installation. After the installation has completed, connect the demo board to the computer serial port using a serial cable and power the board using a 24 V dc supply as described in the Power Supplies section. SOFTWARE OPERATION To run the software, click Start > All Programs > Analog Devices > PLC Demo System > PLC EVALUATION SW V3.x. The window in Figure 12 should appear. 09257-013 1. Figure 13. Menu Bar The following tabs are available in the software: 09257-012 • • • • • • Figure 12. Main Window The menu bar on the left of the main window (see Figure 13) allows the user to select the ADC/DAC channel and range. It also allows the user to set the RS-232 communication port of the PC. Operate Tab The Operate tab can be used with Input Channel 1 and Input Channel 3 as well as all the output channels. In the Operate tab of the software window, you can • • To set up an input channel, see the Demo Systems Hardware section. Ensure the ADC range switches are set correctly for the selected channel. Perform an ADC conversion(s). Write to an output channel. To do this, enter a value in the DAC Output Value box and click Write. The hex value written to the DAC is displayed to the right of these controls. Then, use the correct connector for the specified channel and range. 09257-014 2. Operate tab Thermocouple tab PT1000 RTD tab ADC Stats tab ADC Configure tab DAC Configure tab Figure 14. Operate Tab Rev. 0 | Page 7 of 16 UG-181 PLC Demo System User Guide Thermocouple Tab ADC Stats Tab The Thermocouple tab allows for thermocouple measurement on Output Channel 2. See the Demo Systems Hardware section for setting up a thermocouple channel. Click Run to start the measurement (see Figure 15). The ADC Stats tab can be used to perform statistical analysis on channel input. To carry out this analysis, complete the following steps: The measurement is performed by executing a thermocouple voltage reading (the bias voltage generator for the AD7793 is used for this) followed by a cold-junction reading from the on-board thermistor (using the excitation current sources of the AD7793). 1. 2. 3. 4. 09257-015 09257-016 See the AN-880 Application Note, ADC Requirements for Temperature Measurement Systems, for information on thermocouple measurements using the AD7793. Connect the input channel to the desired source. Select the number of samples to be taken from the No. of Samples box. Click Measure. The sampling can be stopped at any stage by clicking STOP. Once the sampling is complete, the histogram is updated as well as the statistical information (mean, RMS value, p-p noise, standard deviation, and p-p resolution) Figure 17. ADC Stats Tab Figure 15. Thermocouple Tab PT1000 RTD Tab The PT1000 RTD tab allows for RTD measurement on ADC Channel 4. See the Demo Systems Hardware section for setting up an RTD channel. Click Run to start the measurement (see Figure 16). 09257-025 See the AN-880 Application Note, ADC Requirements for Temperature Measurement Systems, and the AD7793 data sheet, for information on RTD measurements using the AD7793. Figure 16. PT1000 RTD Tab Rev. 0 | Page 8 of 16 PLC Demo System User Guide UG-181 ADC Configure Tab DAC Configure Tab Use the ADC Configure tab to alter ADC register settings. Some of these setting are automatically altered when using the Thermocouple or PT1000 RTD tab (see Figure 18). Use the DAC Configure tab to alter the control register of a DAC (see Figure 19). The ADC Configure tab also displays the current calibration values. The ADC can be recalibrated using the following procedure: 2. 3. Connect a (precision) dc source to the system voltage input (Jx3 connector). Ensure that the correct input range is set in both the hardware and the software. Click New Calibration and follow the on-screen instructions. To revert to the default calibration values, click Load Original Values. These default calibration values were created using the DAC outputs. To generate more accurate calibration values, use a precision dc source as previously outlined in this section. 09257-019 1. Figure 19. DAC Configure Tab FIRMWARE 09257-017 The firmware on the ADuC7027 is designed to perform basic communications between the on-board data converters and a PC. This basic firmware is available on the PLC website. The firmware that comes on the PLC demo board also has functions to store calibration data for the PLC demo software. Figure 18. ADC Configure Tab Rev. 0 | Page 9 of 16 UG-181 PLC Demo System User Guide EMC TEST RESULTS A sample was tested during initial release and met the following test compliances. These results should be viewed as typical data taken at 25°C. For these tests, the DAC outputs were connected to the DAC inputs, that is, DAC2 to ADC2, DAC3 to ADC3, and DAC4 to ADC4. The DAC outputs were set to 5 V, 6 V, and 10 mA, respectively. Table 3. Test Item EN55022 EN and IEC 61000-4-2 EN and IEC 61000-4-3 EN and IEC 61000-4-4 EN and IEC 61000-4-5 EN and IEC 61000-4-6 Description Radiated emission Class A, 3-meter anechoic chamber Electrostatic discharge (ESD) ±8 kV VCD Electrostatic discharge (ESD) ±8 kV HCD Radiated immunity 80 MHz to 1 GHz 18 V/m, vertical antenna polarization Radiated immunity 80 MHz to 1 GHz 18 V/m, horizontal antenna polarization Electrically fast transient (EFT) ±4 kV power port Electrically fast transient (EFT) ±2 kV analog I/O ports Power line surge, ±2 kV Conducted immunity test on power cord, 10 V/m for 30 minutes Conducted immunity test on I/O cable 10 V/m for 30 minutes Result Passed and met −6 dB margin. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are respectively −8 ppm, 10 ppm, 13 ppm when there is interference. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are respectively −8 ppm, 10 ppm, 13 ppm when there is interference. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are 0.05%, 0.004%, −0.13%. Performance automatically resorted to ≤0.05% after interference. Class B. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are −0.09%, 0.003%, −0.02%. Performance automatically resorted to ≤0.05% after interference. Class B. Passed Class B. Passed Class B No board or part damage occurred, no performance degrade, passed with Class A. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are respectively 9.3%, 11%, 3.4%. Passed Class B. Maximum deviations in Input Channel 2, Input Channel 3, and Input Channel 4 are respectively 4.5%, 4.7%, 1.4%. Performance automatically resorted to ≤0.05% when interference stopped. Rev. 0 | Page 10 of 16 PLC Demo System User Guide UG-181 SIMPLIFIED INPUT/OUTPUT CIRCUIT DIAGRAMS Figure 21 shows a simplified circuit diagram for Input Channel 3 (Input Channel 4 follows the same format). On the input side, the precision current setting resistor can be switched in and out selecting either current or voltage mode. Resistors RA and RB divide down the pseudodifferential input signal into the range of the AD7793. The AD8226 output is biased with a commonmode signal connected to the REF pin so that the signal meets the input requirements of the AD7793. This circuit has bipolar supplies and, thus, allows bipolar inputs. Figure 20 shows a simplified circuit diagram for Input Channel 1 (Input Channel 2 follows the same format). On the input side, the precision current setting resistor can be switched in and out selecting either current or voltage mode. Resistors RA and RB divide down the input signal into the range of the AD7793. The AD8226 output is biased with a common-mode signal connected to the REF pin so that the signal meets the input requirements of the AD7793. For more information on this circuit, see Circuit Note CN-0067. For more information on a similar circuit, see Circuit Note CN-0067. ADuM5401 TVS 20V 250Ω LOW DRIFT RESISTOR RA 51kΩ RB S1 S3 AD8226 AD7793 ISO AIN1(–) REFIN(+) S5 S6 AD8601 CS SCLK DIN DOUT AIN1(+) S4 RG REF ISO AVDD RG ISO VOA VOB REFIN(–) GND ISO GNDISO ISO VIB VOC VIC VID VOD VSEL ISO VDD1 GND1 VIA GNDISO 5V CS SCLK DIN DOUT RCOUT GND1 GND EXTERNAL INPUTS INPUT FERRITE BEAD VISO 25kΩ ADR441 0.5V VOUT ISO ISO VIN 09257-020 5.1kΩ ISO Figure 20. Input Channel 1 and Input Channel 2—Voltage and Current Input +15V ISO ISOLATED BIPOLAR SUPPLY VIN +15VISO TVS 20V 250Ω LOW DRIFT ISO RESISTOR S3 FERRITE BEAD RA RB RB 51kΩ S1 RG RG REF ADuM1401 OUT VDD2 ISO AD8226 AVDD +15V ISO S4 S5 CS SCLK AD7793 DIN AIN1(–) DOUT REFIN(+) REFIN(–) GND ISO AIN1(+) S6 ISO VOA VDD1 GND1 VIA VOB VIB GND2 VOC VIC VID VOD VE2 ISO ISO GND2 5V CS SCLK DIN DOUT VE1 GND1 GND ADR441 VOUT VIN ISO Figure 21. Input Channel 3 and Input Channel 4—Voltage and Current Input Rev. 0 | Page 11 of 16 09257-021 INPUT FERRITE BEAD RA –15V ISO ADR441 EXTERNAL INPUTS +15V ISO ISO UG-181 PLC Demo System User Guide Figure 23 shows a simplified circuit diagram for the 3-wire RTD inputs. The AD7793 contains two matched excitation current sources for 3-wire RTD measurements. See the AN-880 Application Note, ADC Requirements for Temperature Measurement Systems, and the AD7793 data sheet, for information on RTD measurements using the AD7793. Figure 22 shows a simplified circuit diagram for the thermocouple inputs. The ADC includes an on-chip PGA and can, therefore, accept small signal inputs from sensors directly. The PGA gains can be set for 1, 2, 4, 8, 16, 32, 64, or 128. The PLC demo board also includes an on-board thermistor for the coldjunction compensation measurement. See the AN-880 Application Note, ADC Requirements for Temperature Measurement Systems, and the AD7793 data sheet for information on thermocouple measurements using the AD7793. ADuM5401 S7 AIN1(+) INAMP AIN1(–) 5.1kΩ LOW DRIFT RESISTOR ISO CS SCLK DIN DOUT Σ-Δ ADC GNDISO VOA REFIN(+) REFIN(–) GND ISO ISO 5V CS SCLK DIN VIB VOB VOC VIC VID VOD DOUT RCOUT VSEL ISO VDD1 GND1 VIA GNDISO GND1 GND EXTERNAL INPUTS IOUT2 AVDD IOUT1 AIN2(+) VBIAS AD7793 AIN2(–) S8 THERMISTOR VISO ISO 09257-022 THERMOCOUPLE INPUT ISO Figure 22. Thermocouple Inputs ADuM5401 3-WIRE RTD INPUT IOUT2 IOUT1 AIN2(+) AIN2(–) AIN1(+) AVDD AD7793 AIN1(–) 5.1kΩ LOW DRIFT RESISTOR ISO VOA VIB SCLK VOB DIN VOC VIC VID VOD DOUT VSEL REFIN(+) VDD1 GND1 VIA REFIN(–) GND ISO GNDISO 5V CS SCLK DIN DOUT RCOUT GND1 GND ISO 09257-023 ISO CS GNDISO EXTERNAL INPUTS VISO ISO Figure 23. 3-Wire RTD Inputs Rev. 0 | Page 12 of 16 PLC Demo System User Guide UG-181 transistor has been used for those who may wish to operate at the extremes of the supply voltage, load current, and temperature range. Figure 24 shows a simplified circuit diagram for Output Channel 3 and Output Channel 4. Output Channel 1 and Output Channel 2 are the same except they use the AD5422 internal 10 ppm/°C (maximum) reference. An internal boost transistor is available on-chip though an external boost +15VISO ADR445 VOUT ISO +15V ISO –15V ISO –15V ISO B E ADuM1401 SCLK DIN 0V VDD1 VDD2 GND1 GND2 DVCC AVSS REFIN BOOST VOA LATCH VIB VOB SCLK VIC VOC SDIN VOD VID SDO VE1 VE2 FAULT GND2 10Ω TVS 20V 22nF RL CURRENT OUTPUT ISO IOUT VIA GND1 AVDD ISO AD5422 +VSENSE CLEAR CLEAR GND SELECT ISO ISO FERRITE BEAD VOUT –VSENSE RSET 15kΩ LOW DRIFT RESISTOR CCOMP ISO 4nF ISO Figure 24. Output Channel 3 and Output Channel 4—Voltage and Current Output Rev. 0 | Page 13 of 16 VOLTAGE OUTPUT TVS 20V ISO 09257-024 EXTERNAL INPUTS SYNC 1kΩ –15V ISO 3.3V C +15V ISO ISOLATED BI-POLAR SUPPLY –15V ISO VIN +15V ISO +15VISO For more information on this circuit, see Circuit Note CN-0065. UG-181 PLC Demo System User Guide NOTES Rev. 0 | Page 14 of 16 PLC Demo System User Guide UG-181 NOTES Rev. 0 | Page 15 of 16 UG-181 PLC Demo System User Guide NOTES ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. 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Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG09257-0-8/10(0) Rev. 0 | Page 16 of 16