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3-Terminal PLC Reference Design
TIPD195
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Key Document

Description

This design inputs ±10V or ±20mA and outputs 2.5V±2.3V. It utilizes the INA188, which is a zero-drift instrumentation amplifier. The 2.5V reference voltage is provided by the REF3225. Measured performance yielded just 0.153% error (typical).

Features
  •  3-Terminal PLC Reference Design
  •  Input: ±10 V or ±20 mA
  •  Output: 2.5 V ± 2.3 V
  •  Supplies: ±15V, 5 V
  •  This design yielded less than 0.2% total unadjusted error
  •  This robust circuit reference design includes theory, error analysis, component selection, simulation, PCB design, and measured data that correlates with the simulation

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Schematic/Block Diagram

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Test Data

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA188  36-V, Zero-Drift, Rail-to-Rail-Out Instrumentation Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
REF3225  2.5-V 4-ppm/°C, 100-µA 6-pin SOT-23 series (bandgap) voltage reference  Voltage references  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA188 Download Download
REF3225 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 880 20 May 2015
Design files (3)
Title Type Size (KB) Date
PDF 207 29 Sep 2015
PDF 167 29 Sep 2015
ZIP 964 29 Sep 2015

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