INA-DUAL-2AMP-EVM

www.ti.com Table of Contents User’s Guide INA-DUAL-2AMP-EVM ABSTRACT This user’s guide describes the characteristics, operation, and use of the INA-DUAL-2AMP-EVM, an evaluation module (EVM) that is compatible with a variety of instrumentation amplifiers (INAs). This EVM is compatible with the SOIC-16 (D) and SOIC-16 (DW) INA packages, and is designed to evaluate the performance of the devices in both single-supply and dual-supply configurations. This document includes the schematic, printed circuit board (PCB) layouts, and BOM. Throughout this document the terms evaluation board, evaluation module, and EVM are synonymous with the INA-DUAL-2AMP-EVM. Table of Contents 1 Overview..................................................................................................................................................................................3 1.1 Features............................................................................................................................................................................. 3 1.2 INA Pinout.......................................................................................................................................................................... 3 1.3 Compatible Devices........................................................................................................................................................... 3 SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 1 Trademarks www.ti.com 2 Quick Start...............................................................................................................................................................................4 2.1 Dual-Supply Configuration................................................................................................................................................. 4 2.2 Single-Supply Configuration...............................................................................................................................................5 3 EVM Components................................................................................................................................................................... 8 3.1 Power................................................................................................................................................................................. 8 3.2 Inputs................................................................................................................................................................................. 8 3.3 Output................................................................................................................................................................................ 8 3.4 Reference...........................................................................................................................................................................9 3.5 Miscellaneous.................................................................................................................................................................... 9 4 Schematic, PCB Layout, and Bill of Materials................................................................................................................... 10 4.1 Schematic........................................................................................................................................................................ 10 4.2 PCB Layout...................................................................................................................................................................... 11 4.3 Bill of Materials.................................................................................................................................................................12 List of Figures Figure 1-1. INA-DUAL-2AMP-EVM Pinout.................................................................................................................................. 3 Figure 2-1. Dual-Supply Configuration........................................................................................................................................ 4 Figure 2-2. Single-Supply Configuration, Direct Reference Connection......................................................................................5 Figure 2-3. Single-Supply Configuration, Buffered Reference Connection..................................................................................6 Figure 4-1. INA-DUAL-2AMP-EVM Schematic..........................................................................................................................10 Figure 4-2. INA-DUAL-2AMP-EVM PCB....................................................................................................................................11 List of Tables Table 1-1. Compatible Devices.................................................................................................................................................... 3 Table 4-1. INA-DUAL-2AMP-EVM Bill of Materials....................................................................................................................12 Trademarks X2Y® is a registered trademark of X2Y Attenuators, LLC. All trademarks are the property of their respective owners. 2 INA-DUAL-2AMP-EVM SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Overview 1 Overview 1.1 Features This EVM is intended to provide basic functional evaluation of the instrumentation amplifiers shown in Table 1-1 with the pinout shown in Figure 1-1. The EVM provides the following features: • • • Easy access to nodes with surface-mount test points Reference voltage source flexibility Convenient input and output filtering 1.2 INA Pinout The INA-DUAL-2AMP-EVM evaluates INAs that have the pinout shown in Figure 1-1. U2 U3 1 VINA- VINB- 16 2 VINA+ VINB+ 15 3 RGA RGB 14 4 RGA RGB 13 5 RefA RefB 12 6 VOA VOB 11 7 SenseA SenseB 10 8 V- V+ 9 Figure 1-1. INA-DUAL-2AMP-EVM Pinout 1.3 Compatible Devices Devices that are compatible with the INA-DUAL-2AMP-EVM are shown in Table 1-1. Table 1-1. Compatible Devices Device Package INA2126 SOIC (D) INA2128 SOIC (DW) INA2141 SOIC (DW) SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 3 Quick Start www.ti.com 2 Quick Start 2.1 Dual-Supply Configuration Figure 2-1 shows an example of how to set up the EVM for dual-supply operation. These steps can be applied to channel A or channel B of the dual INA. Operational Amplifier Power Supply Instrumentation Amplifier Power Supply TP1 V+ C1 10µF TP4 TP5 TP6 TP7 TP8 TP9 TP23 TP24 C2 1µF C6 10µF GND C3 10µF C7 1µF TP12 OAVJ2 GND GND V+ V+ TP17 VINA+ R28 R10 R30 GND R11 C16 R15 R8 GND GND TP14 VINA- C9 1µF 1 2 3 VJ1 C4 1µF C8 10µF TP11 1 2 3 OAV+ TP2 R31 V- V- R12 U2 GND C27 R32 U3 0 0 C18 C19 R17 0
R13 V+ C21 R19 R21 GND 1 VINA- VINB- 16 2 VINA+ VINB+ 15 3 RGA RGB 14 4 RGA RGB 13 5 RefA RefB 12 6 VOA GND 7 SenseA R22 8 V- C30 VR14 R16 C20 0 V+ TP22 VINB+ C32 R38 R39 VOB 11 GND SenseB 10 V+ 9 GND R40 V+ C22 0.1µF 0 R35 R37 R33 VTP15 VOA C29 TP20 VINB- GND VR34 C15 0.1µF 0 GND R5 0 TP21 VOB C31 R36 R25 0 GND GND GND GND GND GND Figure 2-1. Dual-Supply Configuration 1. 2. 3. 4. +VS to test point TP1 –VS to test point TP11 Install jumper shunt to position 1 and 2 on J1 Differential input signal connect to test points VinA– (TP14) and VinA+ (TP17) of channel A a. Differential input signal connect to test points VinB– (TP20) and VinB+ (TP22) of channel B 5. Observe output at test point VOA (TP15) a. Observe output at test point VOB (TP21) Note C15 and C22 are prepopulated with 0.1-µF power-supply decoupling capacitors. See the respective device data sheet for additional power-supply decoupling information. 4 INA-DUAL-2AMP-EVM SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Quick Start 2.2 Single-Supply Configuration 2.2.1 Direct Reference Connection Figure 2-2 shows an example of how to set up the EVM for single-supply operation with a direct voltage connection to the reference pin. Operational Amplifier Power Supply Instrumentation Amplifier Power Supply TP1 V+ C1 10µF TP4 TP5 TP6 TP7 TP8 TP9 TP23 TP24 C2 1µF C6 10µF GND C3 10µF C7 1µF C9 1µF TP12 1 2 3 VJ1 C4 1µF C8 10µF TP11 1 2 3 OAVJ2 GND GND V+ V+ TP17 VINA+ R28 R10 R30 GND R11 C16 R15 R8 GND GND TP14 VINA- OAV+ TP2 R31 V- V- R12 U2 GND C27 R32 U3 0 0 C18 C19 R17 R13 0
V+ C21 R19 R21 GND GND 1 VINA- VINB- 16 2 VINA+ VINB+ 15 3 RGA RGB 14 4 RGA RGB 13 5 RefA RefB 12 6 VOA VOB 11 8 V- R16 GND GND C20 0 R38 TP22 VINB+ R39 GND SenseB 10 GND R40 V+ 9 VR34 C15 0.1µF TP10 GND REFA TP18 GND REFB + + GND 0 C32 V+ C22 0.1µF – R35 R37 V+ VVR14 TP15 VOA C29 R33 7 SenseA R22 C30 TP20 VINB- VREFA VREFB – 0 TP21 VOB C31 R36 GND GND GND Figure 2-2. Single-Supply Configuration, Direct Reference Connection 1. 2. 3. 4. +VS to test point TP1 GND to test point TP11 Install jumper shunt to positions 2 and 3 on J1 Remove resistor R5 for REFA a. Remove resistor R25 for REFB 5. Reference voltage to test point REFA (TP10) a. Reference voltage to test point REFB (TP18) 6. Differential input signal connect to test points VinA– (TP14) and VinA+ (TP17) of channel A a. Differential input signal connect to test points VinB– (TP20) and VinB+ (TP22) of channel B 7. Observe output at test point VOA (TP15) a. Observe output at test point VOB (TP21) Note C15 and C22 are prepopulated with 0.1-µF power-supply decoupling capacitors. C22 is not required to be removed for proper single-supply operation. See the respective device data sheet for additional power-supply decoupling information. SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 5 Quick Start www.ti.com 2.2.2 Buffered-Reference Voltage Connection A buffered-reference 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 and preserves common-mode rejection. Figure 2-3 shows an example of how to set up the EVM for single-supply operation with a buffered-reference voltage connection. Depending on the application, desirable single-supply buffer operational amplifiers include the OPA2330 and OPA2376. The OPA2202 is a good choice for highvoltage applications. Instrumentation Amplifier Power Supply TP1 V+ C1 10µF TP4 TP5 TP6 TP7 TP8 TP9 TP23 TP24 C3 10µF C7 1µF TP12 OAVJ2 GND GND V+ V+ R10 R30 R31 V- V- R12 GND C27 R32 U3 U2 C18 R17 R13 V+ C21 R19 R21 GND GND VINB- 16 VINB+ 15 3 RGA RGB 14 4 RGA RGB 13 5 RefA RefB 12 6 VOA VOB 11 8 V- TP15 VOA C20 GND V+ TP10 REFA TP18 GND REFB R4  VS+ 8 GND 0 C12 0 C24 OUTB 7 0 0 2 INA- R2 R9 C28 R18 C23 TP16 OAVinB- R23 3 INA+ INB- 6 4 VS- INB+ 5 R20 C13 GND GND GND OAV+ R3 R7 R36 C10 0.1µF U1 1 OUTA R6 C31 0 R1 C5 TP13 GND OAVinA+ TP21 VOB 0 GND C17 0 TP3 OAVinA- VR34 R25 C11 GND R40 C15 0.1µF GND GND GND GND C32 R38 R5 GND R16 TP22 VINB+ 0 R39 V+ 9 C22 0.1µF 0 R35 R37 V+ VVR14 C29 R33 SenseB 10 7 SenseA R22 C30 GND 0
1 VINA2 VINA+ GND C19 TP20 VINB- 0 0 R24 TP17 VINA+ R28 GND R11 C16 R15 R8 GND GND TP14 VINA- C9 1µF 1 2 3 VJ1 C4 1µF C8 10µF TP11 1 2 3 OAV+ TP2 C2 1µF C6 10µF GND Operational Amplifier Power Supply R26 R27 OAVGND C14 0.1µF GND C26 GND GND TP19 OAVinB+ 0 0 C25 R29 GND GND Figure 2-3. Single-Supply Configuration, Buffered Reference Connection 6 INA-DUAL-2AMP-EVM SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com 1. 2. 3. 4. 5. 6. 7. 8. 9. Quick Start +VS to test point TP1 GND to test points TP11 AND TP12 OAV+ to test point TP2 Install jumper shunt on positions 2 and 3 on J1 and J2 Remove resistor R5 for REFA a. Remove resistor R25 for REFB Populate R1, R4, R6, and R7 with a 0-Ω resistor for channel A a. Populate R18, R24, R26, and R27 with a 0-Ω resistor for channel B Reference voltage to test point OAVinA+ (TP13) a. Reference voltage to test point OAVinB+ (TP19) Differential input signal connect to test points VinA– (TP14) and VinA+ (TP17) of channel A a. Differential input signal connect to test points VinB– (TP20) and VinB+ (TP22) of channel B Observe output at test point VOA (TP15) a. Observe output at test point VOB (TP21) Note C15 and C22 are prepopulated with 0.1-µF power-supply decoupling capacitors. C22 is not required to be removed for proper single-supply operation. See the respective device data sheet for additional power-supply decoupling information. SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 7 EVM Components www.ti.com 3 EVM Components 3.1 Power Power is applied to the INA with test points TP1 and TP11. For the unpopulated operation amplifier used for the reference voltage circuitry (U1), power is applied using test points TP2 and TP12. 3.2 Inputs Inputs are applied to the INA using test points TP14 and TP17 for channel A, and TP20 and TP22 for channel B. The inputs for the op amp are applied through test points TP3 and TP13 for REFA, and TP16 and TP19 for REFB. To maintain linear operation, the INA must remain within the common mode voltage range with respect to the power supplies and differential inputs. A useful tool to calculate whether the INA is operating within safe limits can be found in the TI’s Analog Engineer’s Calculator. Click the + symbol next to Amplifier and Comparators and then click on INA VCM v VOUT. 3.2.1 Input Filtering Components R12, R17, and C16, C18, C21 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. Make C18 approximately ten times larger than C16 and C21. These calculations presume R12 = R17 and C16 = C21. The correlating resistors and capacitors provide input filtering for channel B. Common-mode cutoff frequency: (1) Differential-mode cutoff frequency: (2) 3.3 Output Access the output of the device, with test point TP15 for channel A, and TP21 for channel B. 3.3.1 Output Filtering Components R14 and C20 provide the ability to apply a single-pole RC output filter. The cutoff frequency of the output filter is calculated as shown in Equation 3. The correlating resistor and capacitor provide output filtering for channel B. (3) 8 INA-DUAL-2AMP-EVM SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com EVM Components 3.4 Reference There are multiple methods of applying a reference voltage to the device. A straightforward approach is to apply a voltage to test point TP10 (TP18) with U1 and R5 (R25) not populated. If a buffered voltage is desired, U1 can be populated with an operational amplifier in an appropriate SOIC-8 (D) package and pinout. If the reference voltage is GND, R5 (R25) is populated with a 0-Ω resistor. Reference voltage circuitry on the board provides numerous options for biasing the corresponding reference pins. The EVM layout allows for many configurations to bias the reference pin, such as: • • • • • Sallen-Key 2nd-order filter Buffer configuration Inverting and noninverting gain configurations 1st-order filtering at the noninverting input and feedback path RISO + dual feedback stability compensation scheme 3.5 Miscellaneous C1, C2, C6, and C7 are the populated bypass capacitors for the device, U2 and U3. Similarly, C3, C4, C8 and C9 are populated to provide supply bypassing for U1. C19 and C29 can be used with an X2Y® capacitor. SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 9 Schematic, PCB Layout, and Bill of Materials www.ti.com 4 Schematic, PCB Layout, and Bill of Materials 4.1 Schematic The schematic for the PCB for the INA-DUAL-2AMP-EVM is shown in Figure 4-1. Instrumentation Amplifier Power Supply V+ TP1 C1 10µF TP4 TP5 TP6 TP7 TP8 TP9 TP23 TP24 C2 1µF C3 10µF C7 1µF TP12 OAVJ2 GND R28 R10 R30 GND R11 C16 R31 V- V- R12 GND C27 R32 U3 U2 C18 R17 0
R13 V+ C21 R19 R21 GND 1 VINA- VINB- 16 2 VINA+ VINB+ 15 3 RGA RGB 14 4 RGA RGB 13 5 RefA RefB 12 R22 8 V- TP15 VOA C20 R16 GND R39 GND V+ R25 0 0 TP10 REFA TP21 VOB 0 GND TP18 GND REFB C31 R36 GND GND C24 C10 0.1µF C17 U1 OAV+ R4 R1 1 OUTA VS+ 8 C5 C28 R3 R2 GND GND OUTB 7 3 INA+ INB- 6 4 VS- INB+ 5 R18 C23 R7 R6 C12 R9 2 INA- R24 TP3 OAVinA- TP13 OAVinA+ VR34 R5 C11 GND R40 C15 0.1µF GND GND GND GND C32 R38 V+ 9 C22 0.1µF 0 TP22 VINB+ 0 V+ VVR14 R35 R37 SenseB 10 7 SenseA C29 R33 VOB 11 6 VOA GND C30 GND C19 TP20 VINB- 0 0 GND TP17 VINA+ R8 GND GND R15 GND V+ V+ TP14 VINA- C9 1µF 1 2 3 VJ1 C4 1µF C8 10µF TP11 1 2 3 OAV+ TP2 C6 10µF GND Operational Amplifier Power Supply R20 C13 GND TP16 OAVinB- R23 R26 R27 OAVGND C14 0.1µF C26 GND C25 GND GND TP19 OAVinB+ R29 GND GND Figure 4-1. INA-DUAL-2AMP-EVM Schematic 10 INA-DUAL-2AMP-EVM SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Schematic, PCB Layout, and Bill of Materials 4.2 PCB Layout The component PCB layout for the INA-DUAL-2AMP-EVM is shown in Figure 4-2. Note Figure 4-2 is intended to show how the board is laid out; it is not intended to be used for manufacturing PCBs. Figure 4-2. INA-DUAL-2AMP-EVM PCB SBOU272 – NOVEMBER 2021 Submit Document Feedback INA-DUAL-2AMP-EVM Copyright © 2021 Texas Instruments Incorporated 11 Schematic, PCB Layout, and Bill of Materials www.ti.com 4.3 Bill of Materials Table 4-1 provides the parts list for the EVM. Table 4-1. INA-DUAL-2AMP-EVM Bill of Materials Designator Qty Value C1, C3, C6, C8 4 10 µF CAP, CERM, 10 uF, 35 V, +/- 10%, X7R, 1206 1206 C3216X7R1V106K160AC TDK C2, C4, C7, C9 4 1 µF CAP, CERM, 1 uF, 100 V, +/- 10%, X7S, 0805 0805 C2012X7S2A105K125AB TDK C10, C14, C15, C22 4 0.1 µF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0805 0805 08055C104KAT2A AVX H1, H2, H3, H4 4 Bumpon, Hemisphere, 0.25 X 0.075, Clear 75x250 mil SJ5382 3M J1, J2 2 Header, 2.54mm, 3x1, Tin, TH Header, 2.54mm, 3x1, TH 68001-403HLF FCI R5, R12, R14, R17, R25, R32, R34, R37 8 0 RES, 0, 5%, 0.125 W, 0805 0805 RC0805JR-070RL Yageo America SH-J1, SH-J2 2 1x2 Shunt, 100mil, Gold plated, Black Shunt 382811-6 AMP TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP15, TP16, TP17, TP18, TP19, TP20, TP21, TP22, TP23, TP24 24 Test Point, Miniature, SMT Test Point, Miniature, 5019 SMT 12 Description Package Reference INA-DUAL-2AMP-EVM Part Number Manufacturer Keystone SBOU272 – NOVEMBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable standards, and any other safety, security, regulatory or other requirements. These resources are subject to change without notice. TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource. Other reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these resources. TI’s products are provided subject to TI’s Terms of Sale or other applicable terms available either on ti.com or provided in conjunction with such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products. TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2022, Texas Instruments Incorporated