1 Features

• 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™

1. For all available packages, see the orderable addendum at the end of the data sheet.

space

Simplified Internal Schematic

Extremely Stable Input Capacitance