The OPA1678 (dual-channel) and OPA1679 (quad-channel) operational amplifiers 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. They also offer rail-to-rail output swing to within 800 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range.
The OPA1678 and OPA1679 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 to accommodate the power supply constraints of many types of audio products. These op amps are unity-gain stable and have excellent dynamic behavior over a wide range of load conditions allowing them 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.
The OPA167x temperature ranges are specified from –40°C to +85°C.
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | OPA167x Low-Distortion Audio Operational Amplifiers datasheet (Rev. C) | 24 Jun 2019 |
| Application note | Understanding Op Amp Noise in Audio Circuits | 14 Jun 2021 | |
| Technical article | No headroom, no problem: buffering and filtering an audio signal chain in low-voltage systems | 11 Apr 2019 | |
| Application note | Active-filtering circuit for audio DACs | 16 Jan 2019 | |
| Application note | Phantom Power with Operational Amplifiers (Rev. A) | 09 Nov 2018 | |
| Technical article | “Trust, but verify” SPICE model accuracy, part 3: slew rate and input clamping diodes | 18 Sep 2017 | |
| E-book | The Signal e-book: A compendium of blog posts on op amp design topics | 28 Mar 2017 | |
| Technical article | Amp up your cans: Is your op amp stable? (Part 2) | 22 Jan 2016 | |
| Technical article | Stress-induced outbursts: Microphonics in ceramic capacitors (Part 2) | 23 Dec 2014 | |
| Application note | Compensate Transimpedance Amplifiers Intuitively (Rev. A) | 30 Mar 2005 |
For additional terms or required resources, click any title below to view the detail page where available.
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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