SBOS489A December   2011  – December 2024 OPA1662 , OPA1664

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configurations
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information: OPA1662
    5. 5.5 Thermal Information: OPA1664
    6. 5.6 Electrical Characteristics: VS = ±15V
    7. 5.7 Electrical Characteristics: VS = 5V
    8. 5.8 Typical Characteristics
  7. 6Application and Implementation
    1. 6.1 Application Information
      1. 6.1.1 Operating Voltage
      2. 6.1.2 Input Protection
      3. 6.1.3 Noise Performance
      4. 6.1.4 Basic Noise Calculations
      5. 6.1.5 Total Harmonic Distortion Measurements
      6. 6.1.6 Capacitive Loads
      7. 6.1.7 Power Dissipation
      8. 6.1.8 Electrical Overstress
    2. 6.2 Typical Application
  8. 7Device and Documentation Support
    1. 7.1 Receiving Notification of Documentation Updates
    2. 7.2 Support Resources
    3. 7.3 Trademarks
    4. 7.4 Electrostatic Discharge Caution
    5. 7.5 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • DGK|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.1.3 Noise Performance

Figure 6-3 shows the total circuit noise for varying source impedance values with the op amp in a unity-gain configuration (no feedback resistor network, and therefore no additional noise contributions).

The OPA166x (GBW = 22MHz, G = +1) is shown with total circuit noise calculated. The op amp contributes both a voltage noise component and a current noise component. The voltage noise is commonly modeled as a time-varying component of the offset voltage. The current noise is modeled as the time-varying component of the input bias current and reacts with the source resistance to create a voltage component of noise. Therefore, the lowest noise op amp for a given application depends on the source impedance. For low source impedance, current noise is negligible, and voltage noise generally dominates. The low voltage noise of the OPA166x series op amps makes them a better choice for low source impedances of less than 1kΩ.

The equation in Figure 6-3 shows the calculation of the total circuit noise, with these parameters:

  • en = Voltage noise
  • in = Current noise
  • RS = Source impedance
  • k = Boltzmann’s constant = 1.38 × 10–23 J/K
  • T = Temperature in kelvins (K)

OPA1662 OPA1664 Noise Performance of the OPA166x in Unity-Gain Buffer Configuration Figure 6-3 Noise Performance of the OPA166x in Unity-Gain Buffer Configuration