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Precision op amps (Vos<1mV)

OPA227

ACTIVE

High Precision, Low Noise Operational Amplifiers

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Data sheet

OPA227

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Vos (offset voltage at 25°C) (max) (mV) 0.075 GBW (typ) (MHz) 8 Slew rate (typ) (V/µs) 2.3 Rail-to-rail No Offset drift (typ) (V/°C) 0.0000001 Iq per channel (typ) (mA) 3.7 Vn at 1 kHz (typ) (nV√Hz) 3 CMRR (typ) (dB) 138 Rating Catalog Operating temperature range (°C) -40 to 85 Input bias current (max) (pA) 10000 Iout (typ) (A) 0.045 Architecture Bipolar Input common mode headroom (to negative supply) (typ) (V) 2 Input common mode headroom (to positive supply) (typ) (V) -2 Output swing headroom (to negative supply) (typ) (V) 2 Output swing headroom (to positive supply) (typ) (V) -2 THD + N at 1 kHz (typ) (%) 0.00005
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 5 Vos (offset voltage at 25°C) (max) (mV) 0.075 GBW (typ) (MHz) 8 Slew rate (typ) (V/µs) 2.3 Rail-to-rail No Offset drift (typ) (V/°C) 0.0000001 Iq per channel (typ) (mA) 3.7 Vn at 1 kHz (typ) (nV√Hz) 3 CMRR (typ) (dB) 138 Rating Catalog Operating temperature range (°C) -40 to 85 Input bias current (max) (pA) 10000 Iout (typ) (A) 0.045 Architecture Bipolar Input common mode headroom (to negative supply) (typ) (V) 2 Input common mode headroom (to positive supply) (typ) (V) -2 Output swing headroom (to negative supply) (typ) (V) 2 Output swing headroom (to positive supply) (typ) (V) -2 THD + N at 1 kHz (typ) (%) 0.00005
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • Low noise: 3 nV/√Hz
  • Wide bandwidth:
    • OPA227: 8 MHz, 2.3 V/µs
    • OPA228: 33 MHz, 10 V/µs
  • Settling time: 5 µs
  • High CMRR: 138 dB
  • High open-loop gain: 160 dB
  • Low input bias current: 10 nA maximum
  • Low offset voltage: 75 µV maximum
  • Wide supply range: ±2.5 V to ±18 V
  • Single, dual, and quad versions
  • Low noise: 3 nV/√Hz
  • Wide bandwidth:
    • OPA227: 8 MHz, 2.3 V/µs
    • OPA228: 33 MHz, 10 V/µs
  • Settling time: 5 µs
  • High CMRR: 138 dB
  • High open-loop gain: 160 dB
  • Low input bias current: 10 nA maximum
  • Low offset voltage: 75 µV maximum
  • Wide supply range: ±2.5 V to ±18 V
  • Single, dual, and quad versions

The OPAx227 and OPAx228 series operational amplifiers combine low noise and wide bandwidth with high precision to make them an excellent choice for applications requiring both ac and precision dc performance.

The OPAx227 are unity-gain stable and features high slew rate (2.3 V/µs) and wide bandwidth (8 MHz). The OPAx228 are optimized for closed-loop gains of 5 or greater, and offers higher speed with a slew rate of 10 V/µs and a bandwidth of 33 MHz.

The OPAx227 and OPAx228 series operational amplifiers are an excellent choice for professional audio equipment. In addition, low quiescent current and low cost make these op amps an excellent choice for portable applications requiring high precision.

The OPAx227 and OPAx228 series operational amplifiers are pin-for-pin replacements for the industry-standard OP27 and OP37 with substantial improvements across the board. The dual and quad versions are available for space savings and per-channel cost reduction.

The OPAx227 and OPAx228, are available in DIP-8 and SO-8 packages. The OPA4227 and OPA4228 are available in DIP-14 and SO-14 packages with standard pin configurations. Operation is specified from –40°C to +85°C.

The OPAx227 and OPAx228 series operational amplifiers combine low noise and wide bandwidth with high precision to make them an excellent choice for applications requiring both ac and precision dc performance.

The OPAx227 are unity-gain stable and features high slew rate (2.3 V/µs) and wide bandwidth (8 MHz). The OPAx228 are optimized for closed-loop gains of 5 or greater, and offers higher speed with a slew rate of 10 V/µs and a bandwidth of 33 MHz.

The OPAx227 and OPAx228 series operational amplifiers are an excellent choice for professional audio equipment. In addition, low quiescent current and low cost make these op amps an excellent choice for portable applications requiring high precision.

The OPAx227 and OPAx228 series operational amplifiers are pin-for-pin replacements for the industry-standard OP27 and OP37 with substantial improvements across the board. The dual and quad versions are available for space savings and per-channel cost reduction.

The OPAx227 and OPAx228, are available in DIP-8 and SO-8 packages. The OPA4227 and OPA4228 are available in DIP-14 and SO-14 packages with standard pin configurations. Operation is specified from –40°C to +85°C.
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Technical documentation

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Type Title Date
* Data sheet OPAx227, OPAx228 High-Precision, Low-Noise Operational Amplifiers datasheet (Rev. C) PDF | HTML 13 Mar 2023
Circuit design Circuit for offset adjustment of input signals using precision DAC 25 Jan 2019
Circuit design High-current voltage output circuit using a precision DAC 25 Jan 2019
Application note A Numerical Protection Relay Solution (Rev. A) 26 Jul 2018
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Application note Topology and Noise Using Multiplying DACs (Rev. A) 18 May 2015
Application note Getting the Full Potential from your ADC (Rev. B) 15 May 2015
Application note OPA227, OPA2227, OPA4227, OPA228, OPA2228, OPA4228 EMI Immunity Performance (Rev. A) 02 Nov 2012
Technical article Op Amps used as Comparators—is it okay? 14 Mar 2012
Application note Optoelectronics Circuit Collection 11 Jun 2001

Design & development

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Evaluation board

DIP-ADAPTER-EVM — DIP adapter evaluation module

Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.

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Simulation model

PSpice Simulation Companion for DAC Force And Sense Reference Drive Circuit

SBOMBX7.ZIP (101 KB) - PSpice Model
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OPAx227 PSpice Model (Rev. E)

SBOM051E.ZIP (30 KB) - PSpice Model
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OPAx227 TINA-TI Reference Design (Rev. D)

SBOC188D.TSC (342 KB) - TINA-TI Reference Design
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OPAx227 TINA-TI Spice Model (Rev. C)

SBOM267C.ZIP (10 KB) - TINA-TI Spice Model
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This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:
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CIRCUIT060003 — Temperature sensing with PTC thermistor circuit

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CIRCUIT060009 — Half-wave rectifier circuit

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CIRCUIT060011 — Single-supply, second-order, multiple feedback high-pass filter circuit

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CIRCUIT060012 — Single-supply, 2nd-order, multiple feedback low-pass filter circuit

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Design tool

CIRCUIT060014 — Voltage-to-current (V-I) converter circuit with MOSFET

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CIRCUIT060016 — Non-inverting microphone pre-amplifier circuit

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Design tool

CIRCUIT060017 — Dual-supply, discrete, programmable gain amplifier circuit

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CIRCUIT060018 — Photodiode amplifier circuit

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CIRCUIT060074 — High-side current sensing with comparator circuit

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CIRCUIT060075 — High-speed overcurrent detection circuit

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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TINA-TI — SPICE-based analog simulation program

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Reference designs

TIPD194 — Reference Design for Low-noise Precision Variable Voltage Reference

TIPD194 is a precision dynamic voltage reference source that is able to supply a voltage range from of ±10 V with a 16-bit resolution focusing on initial accuracy and low noise.
Design guide: PDF
Schematic: PDF
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