SBOS940A May   2019  – March 2020 OPA818

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     High-Speed Optical Front-End
  3. 3 Description
    1.     Photodiode Capacitance vs 3-dB Bandwidth
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: VS = ±5 V
    6. 7.6 Typical Characteristics: VS = ±5 V
    7. 7.7 Typical Characteristics: VS = 6 V
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input and ESD Protection
      2. 8.3.2 Feedback Pin
      3. 8.3.3 Decompensated Architecture With Wide Gain-Bandwidth Product
      4. 8.3.4 Low Input Capacitance
    4. 8.4 Device Functional Modes
      1. 8.4.1 Split-Supply Operation (+4/–2 V to ±6.5 V)
      2. 8.4.2 Single-Supply Operation (6 V to 13 V)
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Wideband, Non-Inverting Operation
      2. 9.1.2 Wideband, Transimpedance Design Using OPA818
    2. 9.2 Typical Applications
      1. 9.2.1 High Bandwidth, 100-kΩ Gain Transimpedance Design
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Non-Inverting Gain of 2 V/V
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

3 Description

The OPA818 is a decompensated, voltage-feedback operational amplifier for high-speed and wide dynamic range applications. OPA818 has a low-noise junction gate field-effect transistor (JFET) input stage that combines high gain-bandwidth with a wide supply range from 6 V to 13 V. The fast slew rate of
1400 V/µs provides high large-signal bandwidth and low distortion. This amplifier is manufactured using Texas Instruments' proprietary, high-speed, silicon-germanium (SiGe) process to achieve significant performance improvements over other high-speed, FET-input amplifiers.

The OPA818 is an extremely versatile, wideband TIA photodiode amplifier for use in optical test and communication equipment, and many medical, scientific, and industrial instruments. The OPA818 showcases 2.7 GHz gain-bandwidth, low 2.4 pF total input capacitance, and 2.2 nV/√Hz input noise. The OPA818 can achieve over 85-MHz signal bandwidth in TIA configuration with 20-kΩ TIA gain (RF) and
0.5-pF photodiode capacitance (CD) with wide output swings. The decompensated, low-noise architecture with pico amperes of input bias current is also well-suited for high-gain test and measurement applications. Though normally stable in gains ≥ 7 V/V, the OPA818 can be used in applications with lower gains by applying noise-gain shaping techniques (see Non-Inverting Gain of 2 V/V).

The OPA818 is available in an 8-lead WSON package with an exposed thermal pad for heat dissipation. This device is specified to operate over the industrial temperature range of –40°C to +85°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
OPA818 WSON (8) 3.00 mm × 3.00 mm
  1. For all available packages, see the package option addendum at the end of the data sheet.

Photodiode Capacitance vs 3-dB Bandwidth

OPA818 D100_BW-vs-Cd.gif