The single-channel OPA1677, dual-channel OPA1678, and quad-channel OPA1679 (OPA167x) op amps offer higher system-level performance over legacy op amps commonly used in audio circuitry.
The OPA167x amplifiers achieve a low 4.5-nV/√Hz noise density and low distortion of 0.0001% at 1 kHz, which improves audio signal fidelity. These devices also offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range.
To accommodate the power-supply constraints of many types of audio products, the OPA167x operate over a very-wide supply range of ±2.25 V to ±18 V (or 4.5 V to 36 V) on only 2 mA of supply current. These op amps are unity-gain stable and have excellent dynamic behavior over a wide range of load conditions, allowing the OPA167x to be used in many audio circuits.
The OPA167x amplifiers use completely independent internal circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | OPA167x Low-Distortion Audio Operational Amplifiers datasheet (Rev. E) | PDF | HTML | 22 Dec 2022 |
| White paper | Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) | PDF | HTML | 30 Apr 2024 | |
| Application brief | Understanding Op Amp Noise in Audio Circuits | PDF | HTML | 14 Jun 2021 | |
| Circuit design | Active-filtering circuit for audio DACs | 16 Jan 2019 | ||
| Application note | Phantom Power with Operational Amplifiers (Rev. A) | 09 Nov 2018 | ||
| Application note | Compensate Transimpedance Amplifiers Intuitively (Rev. A) | 30 Mar 2005 |
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Analog Engineer's Calc Installer
Software Manifest
General calculator tool for analog design support.