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TIPD145

Single Supply Op Amp with Drive to True GND

Design files

TIPD145

Design files

Overview

Single supply rail-to-rail amplifiers are commonly used in analog systems.  In some cases it is important to have an amplifier output that drives very close to GND (i.e. a few microvolts).  However, no amplifier can inherently drive this close to GND.  This TI Precision Design shows a simple design modification that allows most standard single supply rail-to-rail amplifiers to drive very close to GND.

Features
  • Drives output to true GND
  • Avoids output swing limitations near GND using pull-down
  • Single-Supply Solution
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

download Schematic — TIPD145
TIDR335.PDF (40 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD145
TIDC209.ZIP (15 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD145
TIDR354.PDF (185 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

OPA313 — Single, 5.5-V, 1-MHz, low quiescent current (50-μA), RRIO operational amplifier

Data sheet: PDF
High-speed op amps (GBW ≥ 50 MHz)

OPA365 — 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier

Data sheet: PDF | HTML

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Software

Technical documentation

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Type Title Date
* User guide Single-Supply Op Amp With True Drive to GND Design Guide Dec. 10, 2013
More literature Precision Amplifier Quickstart Kit brochure (Rev. A) Jan. 13, 2015

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