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.