TI OPA1637DGKR

The OPA1637 is a fully differential audio operational amplifier with low noise and low total harmonic distortion (THD), which can easily filter and drive a fully differential signal chain. The OPA1637 can also convert a single-ended signal source into the differential output required by a high-fidelity analog-to-digital converter (ADC). The bipolar super ß input is designed to achieve excellent low noise and THD, and can produce a very low noise figure at very low quiescent current and input bias current. This device is designed for audio circuits that require low power consumption, high signal-to-noise ratio (SNR), and spurious-free dynamic range (SFDR). The OPA1637 has a high-voltage power supply capability, supporting a power supply voltage of up to ±18V. This feature allows the high-voltage differential signal chain to increase margin and dynamic range without adding a separate amplifier for each polarity of the differential signal. The extremely low voltage and current noise enable the OPA1637 to be used in high-gain configurations with minimal impact on the audio signal noise.

• Low input voltage noise: 3.7nV/√Hz at 1kHz
• Low THD+N: -120dB at 1kHz
• Low supply current: 950μA at ±18V
• Input offset voltage: ±200μV (maximum)
• Input bias current: 2nA (maximum)
• Low bias current noise: 400fA/√Hz at 10Hz
• Gain bandwidth product: 9.2MHz
• Differential output slew rate: 15V/μs
• Wide input and output common-mode range
• Wide single-supply operating voltage range: 3V to 36V
• Low supply current shutdown: <20μA
• Overload power limiting
• Current limiting
• Package: 8-pin VSSOP
• Temperature range: -40°C to +125°C

• Professional audio mixers or control surfaces
• Professional microphones and wireless systems
• Professional speaker systems
• Professional audio amplifiers
• Soundbars
• Turntables
• Professional cameras
• Guitar and other instrument amplifiers
• Data acquisition (DAQ)
• Low-noise, low-power, fully differential amplifier gain modules and interfaces