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OPA1642

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Dual sound-plus high-performance, JFET-input audio op amps

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Dual sound-plus high-performance, JFET-input audio op amps

OPA1642

ACTIVE
Data sheet Order now

Product details

Parameters

Number of channels (#) 2 Total supply voltage (Min) (+5V=5, +/-5V=10) 5 Total supply voltage (Max) (+5V=5, +/-5V=10) 36 GBW (Typ) (MHz) 11 Slew rate (Typ) (V/us) 20 Rail-to-rail In to V-, Out Vos (offset voltage @ 25 C) (Max) (mV) 3.5 Iq per channel (Typ) (mA) 1.8 Vn at 1 kHz (Typ) (nV/rtHz) 5.1 Features Burr-Brown™ Audio, Premium Sound THD + N @ 1 kHz (Typ) (%) 0.00005 Rating Catalog Operating temperature range (C) -40 to 85 Output current (Typ) (mA) 30 Architecture FET CMRR (Typ) (dB) 126 Input bias current (Max) (pA) 20 open-in-new Find other Audio op amps

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Audio op amps

Features

  • Superior Sound Quality
  • True JFET Input Operational Amplifier
    With Low Input Bias Current
  • Low Noise: 5.1 nV/√Hz at 1 kHz
  • Ultralow Distortion: 0.00005% at 1 kHz
  • High Slew Rate: 20 V/µs
  • Unity Gain Stable
  • No Phase Reversal
  • Low Quiescent Current:
    1.8 mA per Channel
  • Rail-to-rail Output
  • Wide Supply Range: ±2.25 V to ±18 V
  • Single, Dual, and Quad Versions Available
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Description

The OPA1641 (single), OPA1642 (dual), and OPA1644 (quad) series are JFET-input, ultralow distortion, low-noise operational amplifiers fully specified for audio applications.

The OPA1641, OPA1642, and OPA1644 rail-to-rail output swing allows increased headroom, making these devices ideal for use in any audio circuit. Features include 5.1-nV/√Hz noise, low THD+N (0.00005%), a low input bias current of 2 pA, and low quiescent current of 1.8 mA per channel.

These devices operate over a very wide supply voltage range of ±2.25 V to ±18 V. The OPA1641, OPA1642, and OPA1644 series of operational amplifiers are unity-gain stable and provide excellent dynamic behavior over a wide range of load conditions.

The dual and quad versions feature completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.

The OPA1641, OPA1642, and OPA1644 are specified from –40°C to +85°C.

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Pin-for-pin with same functionality to the compared device.
OPA1656 ACTIVE SoundPlus™ ultra-low noise and distortion, Burr-Brown™ audio operational amplifier For a lower noise (4.3nV/rtHz), higher bandwidth (53MHz), and higher output drive (100mA) see the OPA1656

Technical documentation

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Type Title Date
* Data sheet OPA164x SoundPlus™ High-Performance, JFET-Input Audio Operational Amplifiers datasheet (Rev. D) Apr. 04, 2016
Application note Understanding Op Amp Noise in Audio Circuits Jun. 14, 2021
Application note MUX-Friendly, Precision Operational Amplifiers (Rev. B) Dec. 17, 2020
Technical article No headroom, no problem: buffering and filtering an audio signal chain in low-voltage systems Apr. 11, 2019
Application note Phantom Power with Operational Amplifiers (Rev. A) Nov. 09, 2018
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical article Amp up your cans: Is your op amp stable? (Part 2) Jan. 22, 2016
Technical article Stress-induced outbursts: Microphonics in ceramic capacitors (Part 2) Dec. 23, 2014
Technical article Stress-induced outbursts: Microphonics in ceramic capacitors (Part 1) Dec. 19, 2014
Application note Analog Applications Journal 4Q 2014 Oct. 24, 2014
Application note Distortion and source impedance in JFET-input op amps Oct. 24, 2014
Application note Compensate Transimpedance Amplifiers Intuitively (Rev. A) Mar. 30, 2005

Design & development

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Design tools & simulation

SIMULATION MODEL Download
SBOM407C.ZIP (10 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SBOM408C.TSC (1784 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SBOM627B.ZIP (14 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
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SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI — TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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CALCULATION TOOL Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
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Reference designs

REFERENCE DESIGNS Download
Tone Stack for Guitar Amplifier Reference Design
TIPD186 — This split-supply, high-performance guitar tone circuit provides control of the bass, mid, and treble frequencies of an electric guitar signal, while also providing gain with minimal distortion and noise. Buffered inputs and outputs preserve the behavior of the system independent of the source and (...)
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Design files
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CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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