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SBOU175 – October 2019

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Copyright © 2019, Texas Instruments Incorporated

OPA462EVM

User's Guide

SBOU175 – October 2019

OPA462EVM

This user's guide describes the characteristics, operation, and use of the evaluation module (EVM) for the
OPA462. The EVM is designed to evaluate the performance of the devices in both single and dual-supply
configurations. This document also includes the schematic, printed circuit board (PCB) layout, and a bill of
materials (BOM). Throughout this document the terms

evaluation board

,

evaluation module

, and

EVM

are

synonymous with OPA462EVM.

WARNING

Danger: HIGH VOLTAGE! This evaluation board is intended for
professional use only. It has exposed high voltages. Do not
operate this board without proper high-voltage/high-current safety
practices. Read

Section 1.4

before using the EVM.

1
2
3
...
»

Summary of Contents for OPA462EVM

Page 1: ... of the devices in both single and dual supply configurations This document also includes the schematic printed circuit board PCB layout and a bill of materials BOM Throughout this document the terms evaluation board evaluation module and EVM are synonymous with OPA462EVM WARNING Danger HIGH VOLTAGE This evaluation board is intended for professional use only It has exposed high voltages Do not ope...

Page 2: ... Schematic PCB Layout and Bill of Materials 9 4 1 EVM Schematic 9 4 2 EVM Default Configuration 10 4 3 PCB Layout 11 4 4 Bill of Materials 12 List of Figures 1 Practical 20 mA Improved Howland Current Pump Circuit 6 2 Improved Howland Current Pump Output Voltage Compliance Range 7 3 Improved Howland Current Pump Applied as a Peak AC Current Generator 8 4 OPA462EVM Schematic 9 5 OPA462EVM Default C...

Page 3: ...following documents listed in Table 1 provide information about TI s integrated circuits and support tools for the OPA462EVM Table 1 Related Documentation Document Literature Number OPA462 Product Data Sheet SBOS803 OPA445 Product Data Sheet SBOS156 1 4 Evaluation Module Limitations and Cautions As a result of the high common mode input voltage rating of the OPA462 evaluation of the device often i...

Page 4: ...age range BNC connectors are available at both inputs to allow for easy interfacing with signal generators or other equipment Additionally signals can be input using test points TP12 IN and TP14 IN Jumpers J7 and J10 set the voltages seen at IN and IN respectively Short pins 2 and 3 of these jumpers to set the inputs to GND Short pins 1 and 2 to allow whatever voltages present at the input BNCs to...

Page 5: ... to source more than the maximum continuous current of 30 mA The status flag can be monitored from TP2 and an external pullup voltage can be input on TP11 2 6 1 Circuit Protection The OPA462EVM is protected from inductive surges and power supply transients with the use of Schottkey diodes on the amplifier output and transient voltage suppressors on the power supply inputs See D1 D2 D3 and D4 on th...

Page 6: ...rt information is applied here in this section as a practical use for the OPA462EVM The OPA462EVM as configured in Figure 1 sources on an output current of 20 mA when a single ended input voltage of 2 5 V is applied to the VP input If the input voltage sign is reversed the output reverses direction and sinks 20 mA The circuit in Figure 1 provides the resistance values required to obtain the correc...

Page 7: ... This limit can be seen in Figure 2 Resistor RL can be any value from 0 Ω to 2 87 kΩ and the output will remain within the circuit linear compliance range However if the value of RL is increased further the current pump operation is forced outside the compliance range and the output current will no longer remain constant Thus increasing the value of RL to greater than 2 87 kΩ defeats the goal of p...

Page 8: ... not always provide stability When unity gain stable op amps such as the OPA462 are employed and they drive a resistive load the op amp phase margin should be sufficient such that the circuit is stable However if the output load is complex containing both resistive and reactive components R jX there can be combinations that degrade the phase margin and instability results Degradation of the phase ...

Page 9: ...T 16 E D Com GND E D TP T T 10 E D EXT GND 0 1uF C7 1 2 3 J4 1 2 3 J3 V SF TP T T 2 SF T TP T T 11 SF EXT GND 0 1uF C8 p D3 D4 V V 2 3 1 8 Q1A 6 7 4 5 Q2B A B C D C D 2 3 1 8 Q2A 6 7 4 5 Q1B C D A B Input Protection 2 3 1 8 Q1A 6 7 4 5 Q2 Q Q B 2 3 1 8 Q2 Q Q A 6 7 4 5 Q1B Input Protection 0 R13 0 R1 100k R3 E D Com 10uF C2 10uF C3 10uF C5 10uF C6 1 2 J1 1 2 J2 2 1 3 4 5 V V 6 8 7 9 OPA462IDDAR U1...

Page 10: ... V V 100k R3 E D Com J8 Vout J6 In J9 In 10uF C2 10uF C3 10uF C5 10uF C6 1 2 J1 1 2 J2 2 1 3 4 5 V V 6 8 7 9 OPA462IDDAR U1 100k R2 Ext GND GND Ext 90V D1 90V D2 Schematic PCB Layout and Bill of Materials www ti com 10 SBOU175 October 2019 Submit Documentation Feedback Copyright 2019 Texas Instruments Incorporated OPA462EVM 4 2 EVM Default Configuration The OPA462EVM ships in a standard amplifier ...

Page 11: ...n Feedback Copyright 2019 Texas Instruments Incorporated OPA462EVM 4 3 PCB Layout Figure 6 depicts the PCB layout Figure 6 OPA462EVM PCB Layout NOTE Board layout is not to scale This figure is intended to show how the board is laid out and is not intended to be used for manufacturing OPA462EVM PCBs ...

Page 12: ...3 J4 J5 J7 J10 J12 6 Header 2 54mm 3x1 Tin TH 68001 403HLF FCI J6 J8 J9 3 BNC Low Profile Elbow Jack Gold R A TH 5 1634513 1 TE Connectivity R1 R8 R13 3 RES 0 5 0 1 W 0603 RC0603JR 070RL Yageo R2 R3 2 RES 100 k 1 0 1 W AEC Q200 Grade 0 0603 CRCW0603100KFKEA Vishay Dale R4 1 RES 10 0 k 0 1 0 1 W 0603 RG1608P 103 B T5 Susumu Co Ltd R6 R7 2 RES 0 5 1 W 2512 RC6432J000CS Samsung SH J1 SH J2 SH J3 SH J...

Page 13: ...o 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 indemn...

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