SBOS484D December 2009  – April 2016 OPA1641 , OPA1642 , OPA1644

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Phase Reversal Protection
      2. 7.3.2Output Current Limit
      3. 7.3.3EMI Rejection Ratio (EMIRR)
        1. 7.3.3.1EMIRR IN+ Test Configuration
    4. 7.4Device Functional Modes
      1. 7.4.1Operating Voltage
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1Noise Performance
      2. 8.1.2Basic Noise Calculations
      3. 8.1.3Total Harmonic Distortion Measurements
      4. 8.1.4Source Impedance and Distortion
      5. 8.1.5Capacitive Load and Stability
      6. 8.1.6Power Dissipation and Thermal Protection
      7. 8.1.7Electrical Overstress
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Development Support
        1. 11.1.1.1TINA-TI (Free Software Download)
        2. 11.1.1.2TI Precision Designs
        3. 11.1.1.3WEBENCH® Filter Designer
    2. 11.2Documentation Support
      1. 11.2.1Related Documentation
    3. 11.3Related Links
    4. 11.4Community Resources
    5. 11.5Trademarks
    6. 11.6Electrostatic Discharge Caution
    7. 11.7Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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™

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
OPA1641SOIC (8)4.90 mm × 3.90 mm
VSSOP (8)3.00 mm × 3.00 mm
OPA1642SOIC (8)4.90 mm × 3.90 mm
VSSOP (8)3.00 mm × 3.00 mm
OPA1644SOIC (14)8.65 mm × 3.90 mm
TSSOP (14)5.00 mm × 4.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

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Simplified Internal Schematic

OPA1641 OPA1642 OPA1644 pg1_fbd_bos484.gif

Extremely Stable Input Capacitance

OPA1641 OPA1642 OPA1644 C304_SBOS484.png