1 Features

1• Superior Sound Quality

• True JFET Input Operational Amplifier

With Low Input Bias Current

• Low Noise: 5.1 nV/√Hz at 1 kHz

• Ultralow Distortion: 0.00005% at 1 kHz

• High Slew Rate: 20 V/μs

• Unity Gain Stable

• No Phase Reversal

• Low Quiescent Current:

1.8 mA per Channel

• Rail-to-rail Output

• Wide Supply Range: ±2.25 V to ±18 V

• Single, Dual, and Quad Versions Available

2 Applications

• Professional Audio Equipment

• Analog and Digital Mixing Consoles

• Broadcast Studio Equipment

• High-End A/V Receivers

• High-End Blu-ray™ Players

3 Description

The OPA1641 (single), OPA1642 (dual), and

OPA1644 (quad) series are JFET-input, ultralow

distortion, low-noise operational amplifiers fully

specified for audio applications.

The OPA1641, OPA1642, and OPA1644 rail-to-rail

output swing allows increased headroom, making

these devices ideal for use in any audio circuit.

Features include 5.1-nV/√Hz noise, low THD+N

(0.00005%), a low input bias current of 2 pA, and low

quiescent current of 1.8 mA per channel.

These devices operate over a very wide supply

voltage range of ±2.25 V to ±18 V. The OPA1641,

OPA1642, and OPA1644 series of operational

amplifiers are unity-gain stable and provide excellent

dynamic behavior over a wide range of load

conditions.

The dual and quad versions feature completely

independent circuitry for lowest crosstalk and

freedom from interactions between channels, even

when overdriven or overloaded.

The OPA1641, OPA1642, and OPA1644 are

specified from –40°C to +85°C. SoundPlus™