OPA1678IDR Description




The dual-channel OPA1678IDR op amp outperforms traditional op amps frequently used in audio circuitry at the system level.

The OPA1678IDR amplifier has a low noise density of 4.5 nV/√Hz and low distortion of 0.0001% at 1 kHz, which improves audio signal fidelity. With a 2-kΩ load, these devices also provide rail-to-rail output swing to within 800 mV, increasing headroom and maximizing dynamic range.

The OPA1678IDR operates 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 satisfy the power-supply limits of various types of audio equipment. Because the OPA1678IDR is unity-gain stable and has great dynamic behavior over a wide range of load circumstances, it can be employed in a variety of audio circuits.

Even when overdriven or overloaded, the OPA1678IDR amplifier uses totally independent internal circuitry for the lowest crosstalk and freedom from channel interactions.





OPA1678IDR Features



? Low noise at 1 kHz: 4.5 nV/√Hz

? Low distortion at 1 kHz: 0.0001 percent

? 114 dB of open-loop gain

? 110 dB of common-mode rejection

? Quiescent current is low:

– each channel 2 mA

? Input bias current is low: 10 pA (typical)

? Wide gain bandwidth: 16 MHz (G = 1)

? Slew rate: 9 V/μs

? Stable unity gain

? Output rail-to-rail

? A wide selection of products:

- ±2.25 to ±18 volts, or 4.5 to 36 volts

? Available in single, dual, and quad-channel configurations

? Packages available:

– SOIC-8 (preview), SOT-23 (single)

– Dual: SOIC-8, VSSOP-8, tiny SON-8

– Quad: QFN-16, SO-14, TSSOP-14, Small QFN-16

? –40°C to +85°C temperature range





OPA1678IDR Applications



? Professional microphones and wireless systems

? Professional audio mixer/control surface

? Guitar and other musical instrument amplifiers

? A/V receiver

? Automotive external amplifier