1 Features
• Excellent sound quality
• Ultra-low distortion: 0.00008%
• Low noise: 8nV/√Hz
• True FET-input: IB = 5pA
• High speed:
– Slew rate: 20V/μs
– Bandwidth: 8MHz
• High open-loop gain: 120dB (2kΩ)
• Wide supply range: ±2.5V to ±18V
• Single, dual, and quad versions

2 Applications
• Professional audio and music
• Line drivers
• Line receivers
• Multimedia audio
• Active filters
• Preamplifiers
• Integrators
• Crossover networks

3 Description
The OPA134, OPA2134, and OPA4134 (OPAx134)
series are ultra-low distortion, low-noise operational
amplifiers fully specified for audio applications. A
true FET input stage is incorporated to provide
excellent sound quality and speed for exceptional
audio performance. This feature, in combination
with high output drive capability and excellent dc
performance, allows for use in a wide variety of
demanding applications. In addition, the OPAx134
series has a wide output swing, to within 1V of the
rails, allowing increased headroom and making these
devices an excellent choice for use in any audio
circuit.
The OPAx134 SoundPlus™ audio operational
amplifiers are easy to use and free from phaseinversion
and the overload problems often found
in common FET-input operational amplifiers. The
devices can be operated from ±2.5V to ±18V power
supplies. Input cascode circuitry provides excellent
common-mode rejection and maintains low input bias
current over the wide input voltage range, minimizing
distortion. The OPAx134 series operational amplifiers
are unity-gain stable and provide excellent dynamic
behavior over a wide range of load conditions,
including high load capacitance. The dual and quad
versions feature completely independent circuitry for
lowest crosstalk and freedom from interaction, even
when overdriven or overloaded.
Single and dual versions are available in 8-pin
DIP and SO-8 surface-mount packages in standard
configurations. The quad is available in SO-14
surface-mount package. All are specified for –40°C
to +85°C operation. A SPICE macromodel is available
for design analysis.