INA826EVM

User's Guide SBOU115C – August 2011 – Revised March 2012 INA826EVM This user's guide describes the characteristics, operation, and use of the evaluation module (EVM) for the INA826. The EVM is designed to evaluate the performance of the device in both single and dual-supply configurations. This document also includes the schematic, printed circuit board (PCB) layouts, and a complete bill of materials (BOM). Throughout this document the terms evaluation board, evaluation module, and EVM are synonymous with the INA826EVM. 1 2 3 4 5 6 Contents Introduction and Overview ................................................................................................. Quick Start ................................................................................................................... EVM Components ........................................................................................................... Schematic .................................................................................................................... Bill of Materials .............................................................................................................. Related Documentation from Texas Instruments ....................................................................... 2 4 7 8 9 9 List of Figures 1 INA826EVM Schematic Side .............................................................................................. 2 2 INA826EVM Component Side ............................................................................................. 3 3 INA826EVM: Dual-Supply Configuration................................................................................. 4 4 INA826EVM: Single-Supply Configuration, Direct REF Connection ................................................. 5 5 INA826EVM: Single-Supply Configuration, Buffered REF Connection .............................................. 6 6 INA826EVM Schematic .................................................................................................... 8 X2Y is a registered trademark of X2Y Attenuators, LLC. All other trademarks are the property of their respective owners. SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated INA826EVM 1 Introduction and Overview www.ti.com 1 Introduction and Overview 1.1 INA826 The INA826 is a low-power, wide-supply voltage instrumentation amplifier that can operate in both single and dual supply configurations. A single external resistor sets the gain from 1 to 1000. The input voltage range extends from the negative power supply to 1.0 V below the positive power supply. The rail-to-rail output allows for use in low-voltage applications. The device operates with a supply voltage between 2.7 V and 36 V and draws a maximum quiescent current of 250 µA. The device is available in MSOP-8, SO-8, and DFN-8 packages. 1.2 INA826EVM The INA826EVM is intended to provide basic functional evaluation of the INA826. It provides the following features: • • • • • Intuitive evaluation with the silkscreen schematic Easy access to nodes with surface-mount test points Advanced evaluation with two prototype areas Reference voltage source flexibility Convenient input and output filtering The schematic and component sides of the EVM are shown in Figure 1 and Figure 2, respectively. NOTE: Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing INA826EVM PCBs. Figure 1. INA826EVM Schematic Side 2 INA826EVM SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Introduction and Overview www.ti.com Figure 2. INA826EVM Component Side SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated INA826EVM 3 Quick Start 2 www.ti.com Quick Start The procedures presented in this section describe how to quickly set up and use the INA826EVM for evaluation in dual-supply and single-supply configurations. 2.1 Dual Supply Make the following connections to set up the INA826EVM for dual-supply operation. 1. 2. 3. 4. 5. +15 V to V+ test point –15 V to V– test point Ground to REF test point or install a 0 Ω resistor as R5 Differential input (for example, a 1-VPP sine wave) to V–IN and V+IN test points Oscilloscope to VO test point Ensure that R1 = R2 = RO = 0 Ω and that RG and CO are not populated. Figure 3 depicts a proper dualsupply configuration. V+ C10 10 F U1 V–IN C7 0.1 F + – 15 V INA826 R1 –IN VO +VS 0Ω Sine Wave 1 VPP RO VOUT RG 0Ω V+IN + RG REF V– R2 –VS R5 +IN C9 10 F C6 + – 0Ω 0Ω 15 V 0.1 F GND Figure 3. INA826EVM: Dual-Supply Configuration 4 INA826EVM SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Quick Start www.ti.com 2.2 Single Supply Make the following connections to set up the INA826EVM for single-supply operation with a direct connection for the reference voltage. 1. 2. 3. 4. 5. +5 V to V+ test point GND to V– test point +2.5 V to REF test point Differential input (for example, a 1-VPP sine wave) to V–IN and V+IN test points Oscilloscope to VO test point Ensure that R1 = R2 = RO = 0 Ω and that RG , R5, and CO are not populated. Figure 4 depicts a proper single-supply configuration with a direct REF connection. V+ C10 10 F U1 V–IN C7 0.1 F + – 5V INA826 R1 –IN VO +VS 0Ω Sine Wave 1 VPP RO VOUT RG 0Ω REF V+IN + RG REF V– R2 + – –VS +IN 0Ω C9 10 F 2.5 V C6 0.1 F Figure 4. INA826EVM: Single-Supply Configuration, Direct REF Connection SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated INA826EVM 5 Quick Start www.ti.com Make the following connections to set up the INA826EVM for single-supply operation with a buffered reference voltage. This example uses an OPA376 as the buffer operational amplifier. Depending on the application, alternate single-supply buffer operational amplifiers include the OPA330 and OPA378. The OPA277 is a good choice for high-voltage applications. The buffered configuration is useful when the source impedance is high (for example, a voltage divider). Buffering a high-impedance source with an operational amplifier provides a low-impedance source, which preserves common-mode rejection. 1. 2. 3. 4. 5. 6. 7. +5 V to V+ and OAV+ test points GND to V– and OAV– test points +2.5 V to OAVIN+ test point Populate R3 with a 0-Ω resistor Populate C4, C5, C11, and C12 with bypass capacitors Differential input (for example, a 1-VPP sine wave) to V–IN and V+IN test points Oscilloscope to VO test point Ensure that R1 = R2 = RO = 0 Ω and that RG, CO, R4, and R5 are not populated. Figure 5 depicts a proper dual-supply configuration with a buffered REF voltage. V+ C10 10 F U1 V–IN + – C7 0.1 F 5V INA826 R1 –IN VO +VS 0Ω Sine Wave 1 VPP RO VOUT RG 0Ω + RG V+IN REF V– R2 –VS +IN 0Ω C9 C6 10 F 0.1 F OAV+ R3 C12 0Ω 10 F U2 C4 0.1 F + – 5V OPA376 1 OAVIN+ 8 2 + – + 2.5 V 7 OAV– C11 10 F 3 6 4 5 C5 0.1 F Figure 5. INA826EVM: Single-Supply Configuration, Buffered REF Connection 6 INA826EVM SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated EVM Components www.ti.com 3 EVM Components This section summarizes the INA826EVM components. 3.1 Power Power is applied to the INA826 with test points V+ and V–. For the unpopulated device (U2), power is applied using test points OAV+ and OAV–. 3.2 Inputs Inputs are applied to the INA826 using test points V+IN and V–IN. Alternately, they can be applied by populating the input SMA connectors (J1 and J2). The inputs for U2 are applied via test points OAVIN+ and OAVIN–. 3.2.1 Input Filtering R1, R2, and C1 through C3 provide the ability to apply common-mode and differential-mode filtering to the inputs. The cutoff frequencies for the filters are shown in Equation 1 and Equation 2. It is recommended to make C2 approximately ten times larger than C1 and C3. These calculations presume R1 = R2 and C1 = C3. Common-mode cutoff frequency: f c − cm = 1 2π ⋅ R1 ⋅ C 1 (1) Differential-mode cutoff frequency: f c−dm = 3.3 1 C1   2π (R1 + R 2) C 2 +  2   (2) Outputs The output of the INA826 can be accessed with test point VO. Alternately, it can be accessed by populating the output SMA connector (J3). 3.3.1 Output Filtering RO and CO provide the ability to apply a single-pole RC output filter. The cutoff frequency of the output filter can be calculated as shown in Equation 3. fc−o = 3.4 1 2 π ⋅ RO ⋅ CO (3) Reference There are multiple methods of applying a reference voltage to the INA826. A straightforward approach is to apply a voltage to the REF test point with U2 not populated. If a buffered voltage is desired, U2 can be populated with an operational amplifier in an appropriate SO-8 package and pinout. 3.5 Prototype Area Two prototype areas are provided for flexible evaluation. For example, they could be used to prototype a voltage divider for a buffered reference voltage or to supply a direct reference voltage with a device such as the REF3225. SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated INA826EVM 7 Schematic 3.6 www.ti.com Miscellaneous C6, C7, C9, and C10 are the supply bypass capacitors for the INA826. Similarly, C4, C5, C11, and C12 can be populated to provide supply bypassing for U2. C8 is available for the use of an X2Y® capacitor. 4 Schematic 4.1 Schematic Figure 6 shows the schematic for the INA826EVM PCB. V+ C10 10 F U1 V–IN C7 0.1 F INA826 R1 C1 –IN VO +VS 0Ω SMA VOUT RG RG REF RG V+IN + C2 RO SMA V– R2 –VS SMA 0Ω CO REF R5 +IN 0Ω C9 C3 10 F C6 0.1 F GND R3 OAV+ C13 C4 C12 U2 1 OAVIN+ OAVIN– 8 R4 2 7 + OAV– C11 3 6 4 5 C5 Figure 6. INA826EVM Schematic 8 INA826EVM SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Bill of Materials www.ti.com 5 Bill of Materials Table 1 provides the parts list for the INA826EVM. Table 1. INA826EVM Bill of Materials Count 6 RefDes Value Description Part Number MFR 1 U1 N/A INA826, SO-8 INA826AID Texas Instruments 3 R1, R2, RO 0Ω Resistor, 1/4W, 1206 RMCF1206ZT0R00 Stackpole Electronics 2 C9, C10 10 µF Ceramic bypass capacitors, 50 V, X5R, 10%, 1206 GRM31CR61H106KA2L Murata 2 C6, C7 0.1 µF Ceramic bypass capacitors, 50 V, X7R, 20%, 1206 12065C104MAT2A AVX Corporation 34 Various N/A Surface Mount Test Points 5015 Keystone Electronics 8 N/A N/A Bumpon, cylindrical, 0.375 X 0.135, Black SJ61A8 3M Related Documentation from Texas Instruments The following documents provide information regarding Texas Instruments' integrated circuits and support tools for the INA826EVM. This user's guide is available from the TI web site under literature number SBOU115. Any letter appended to the literature number corresponds to the document revision that is current at the time of the writing of this document. Newer revisions may be available from the TI web site, or call the Texas Instruments' Literature Response Center at (800) 477-8924 or the Product Information Center at (972) 644-5580. When ordering, identify the document by both title and literature number. Related Documentation Document Literature Number INA826 Product Data Sheet SBOS562 OPA376 Product Data Sheet SBOS406 OPA277 Product Data Sheet SBOS079 OPA330 Product Data Sheet SBOS432 OPA378 Product Data Sheet SBOS417 REF3225 Product Data Sheet SBVS058 SBOU115C – August 2011 – Revised March 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated INA826EVM 9 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 –18 V to +17 V and the output voltage range of –14 V to +14 V. 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 +30°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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