Low-distortion audio operational amplifier offers higher system-level performance over legacy op amps

The Texas Instruments OPA1678 (dual-channel) and OPA1679 (quad-channel) operational amplifiers offer higher system-level performance over legacy op amps commonly used in audio circuitry. The amplifiers achieve a low 4.5nV/vHz 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 800mV with a 2kOhm load, which increases headroom and maximizes dynamic range. The devices operate over a very wide supply range of ±2.25V to ±18V or (4.5V to 36V) on only 2mA of supply current to accommodate the power supply constraints of many types of audio products. These op amps are unity-gain stable and provide excellent dynamic behaviour over a wide range of load conditions allowing them to be used in many audio circuits. The amplifiers use completely independent internal circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded. Their temperature ranges are specified from –40C to +85C.