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
The OPA167x temperature ranges are specified from –40°C
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