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Precision op amps (Vos<1mV)

OPA3S328

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High-speed (40 MHz) high-precision (60 µV) low-noise op amp with integrated gain switches

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Data sheet

OPA3S328

ACTIVE
Data sheet Order now

Product details

Number of channels 2 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.2 Vos (offset voltage at 25°C) (max) (mV) 0.06 Offset drift (typ) (µV/°C) 0.15 Input bias current (max) (pA) 10 GBW (typ) (MHz) 40 Features Shutdown, Small Size, Zero Crossover Slew rate (typ) (V/µs) 30 Rail-to-rail In, Out Iq per channel (typ) (mA) 3.8 Vn at 1 kHz (typ) (nV√Hz) 9.8 CMRR (typ) (dB) 120 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.063 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.005 Output swing headroom (to positive supply) (typ) (V) -0.005 THD + N at 1 kHz (typ) (%) 0.00017
Number of channels 2 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.2 Vos (offset voltage at 25°C) (max) (mV) 0.06 Offset drift (typ) (µV/°C) 0.15 Input bias current (max) (pA) 10 GBW (typ) (MHz) 40 Features Shutdown, Small Size, Zero Crossover Slew rate (typ) (V/µs) 30 Rail-to-rail In, Out Iq per channel (typ) (mA) 3.8 Vn at 1 kHz (typ) (nV√Hz) 9.8 CMRR (typ) (dB) 120 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.063 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.005 Output swing headroom (to positive supply) (typ) (V) -0.005 THD + N at 1 kHz (typ) (%) 0.00017
VQFN (RGR) 20 12.25 mm² (3.5 mm × 3.5 mm) DSBGA (YBJ) 24 4 mm² (2 mm × 2 mm)
  • Precision operational amplifier with integrated switches for transimpedance applications
  • Wide bandwidth: 40 MHz
  • Low offset voltage: 60 µV (max)
  • Very low offset drift: 1 µV/°C (max)
  • Low input bias current: 0.2 pA
  • Rail-to-rail input and output
  • Zero-crossover input stage
  • Low voltage noise: 6.1 nV/√Hz at 10 kHz
  • Low current noise: 0.125 pA/√Hz at 10 kHz
  • Low leakage switches: 10 pA
  • Slew rate: 30 V/µs
  • Quiescent current: 3.8 mA per channel
  • Current in shutdown mode: 30 µA
  • Output impedance in shutdown mode: 100 GΩ
  • Single-supply voltage range: 2.2 V to 5.5 V
  • Unity-gain stable
  • Small packages:
    • 20-lead, 3.5-mm x 3.5-mm VQFN
    • 2.0-mm x 2.0-mm DSBGA
  • Precision operational amplifier with integrated switches for transimpedance applications
  • Wide bandwidth: 40 MHz
  • Low offset voltage: 60 µV (max)
  • Very low offset drift: 1 µV/°C (max)
  • Low input bias current: 0.2 pA
  • Rail-to-rail input and output
  • Zero-crossover input stage
  • Low voltage noise: 6.1 nV/√Hz at 10 kHz
  • Low current noise: 0.125 pA/√Hz at 10 kHz
  • Low leakage switches: 10 pA
  • Slew rate: 30 V/µs
  • Quiescent current: 3.8 mA per channel
  • Current in shutdown mode: 30 µA
  • Output impedance in shutdown mode: 100 GΩ
  • Single-supply voltage range: 2.2 V to 5.5 V
  • Unity-gain stable
  • Small packages:
    • 20-lead, 3.5-mm x 3.5-mm VQFN
    • 2.0-mm x 2.0-mm DSBGA

The OPA3S328 is a precision, low-voltage, CMOS operational amplifier (op amp) with integrated switches that are optimized for flexible transimpedance applications. Low input bias current and low input capacitance allows for high-frequency transimpedance gains at low photocurrent operation (< 1 nA). The integrated switches, low offset, and rail-to-rail output performance of the OPA3S328 enable high accuracy across multiple decades of current values. Small packages, along with integrated switches, allow for selectable transimpedance gains and help reduce size for space-constrained applications.

The OPA3S328 features zero-crossover input technology, giving the flexibility for the input common-mode range to span the full supply range without offset deviations. The device provides enable-disable capability to allow for portable, handheld applications in test and measurement. When disabled, the OPA3S328 output impedance is typically 100 GΩ, allowing for wired-OR applications using multiple transimpedance channels.

The OPA3S328 is a precision, low-voltage, CMOS operational amplifier (op amp) with integrated switches that are optimized for flexible transimpedance applications. Low input bias current and low input capacitance allows for high-frequency transimpedance gains at low photocurrent operation (< 1 nA). The integrated switches, low offset, and rail-to-rail output performance of the OPA3S328 enable high accuracy across multiple decades of current values. Small packages, along with integrated switches, allow for selectable transimpedance gains and help reduce size for space-constrained applications.

The OPA3S328 features zero-crossover input technology, giving the flexibility for the input common-mode range to span the full supply range without offset deviations. The device provides enable-disable capability to allow for portable, handheld applications in test and measurement. When disabled, the OPA3S328 output impedance is typically 100 GΩ, allowing for wired-OR applications using multiple transimpedance channels.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet OPA3S328 40-MHz, Dual, Precision, Low-Noise, Low-Input-Bias-Current CMOS Operational Amplifier With Integrated Switches datasheet (Rev. D) PDF | HTML Dec 15, 2023
Application note Amplifier Input Common-Mode and Output-Swing Limitations PDF | HTML Jan 14, 2022
Technical article How can I achieve accurate gain error and drift with a switched-gain transimpedanc PDF | HTML Oct 14, 2021
Application note Build a Programmable Gain Transimpedance Amplifiers Using the OPA3S328 PDF | HTML May 12, 2021
E-book An Engineer’s Guide to Designing with Precision Amplifiers Apr 29, 2021
Certificate OPA3S328EVM EU RoHS Declaration of Conformity (DoC) Nov 19, 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

OPA3S328EVM — OPA3S328 evaluation module for high-speed (40 MHz) high-precision (60 µV) low-noise op amp

 The OPA3S328 evaluation module (EVM) is designed to provide access to the features and measure the performance of the OPA3S328. TOPA3S328 is a precision, low-voltage CMOS operational amplifier with integrated switches optimized for flexible transimpedance applications. 

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Simulation model

Discrete Impedance Spectroscopy TINA-TI Reference Design (Single-Ended)

SBOMBM1 (1083 KB) - TINA-TI reference design
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Simulation model

OPA3S328 PSPICE Model (Rev. B)

SBOMBI7B.ZIP (42 KB) - PSpice model
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Simulation model

OPA3S328 SPICE Model (Generic)

SBOMCK3.ZIP (7 KB) - TINA-TI Spice model
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Simulation model

OPA3S328 TINA-TI Reference Design (Rev. A)

SBOMBI8A (688 KB) - TINA-TI reference design
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Simulation model

OPA3S328 TINA-TI Spice Model (Rev. A)

SBOMBI6A.ZIP (15 KB) - TINA-TI Spice model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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Calculation tool

OPAMP-NOISECALC — Noise Calculator

This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:

  • A noise generator tool - This is a Lab View 4-Run Time executable that generates Gaussian white noise, uniform white noise, 1/f noise, short noise, and 60Hz line noise. Temporal data, (...)
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VQFN (RGR) 20 Ultra Librarian
DSBGA (YBJ) 24 Ultra Librarian
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