OPAx134 High-Performance, SoundPlus™ Audio Operational Amplifiers

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

Frequency (Hz)

0.01

0.001

0.0001

0.00001

20

100

1k

10k

20k

V

S = ±16

V

S = ±17

V

S = ±18

V = 10Vrms

O

R = 2k

L

W

THD+Noise vs Frequency

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 phase-

inversion 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.

Device Information

PART NUMBER

CHANNEL COUNT

PACKAGE(1)

OPA134

Single

D (SOIC, 8)

P (PDIP, 8)

OPA2134

Dual

D (SOIC, 8)

P (PDIP, 8)

OPA4134

Quad

D (SOIC, 14)

(1)

For more information, see also Section 10.

OPA134, OPA2134, OPA4134

SBOS058B – DECEMBER 1997 – REVISED NOVEMBER 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.