JAJSHS5C August   2019  – August 2020 OPA862

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: VS = ±2.5 V to ±5 V
    6. 6.6 Typical Characteristics: VS = ±5 V
    7. 6.7 Typical Characteristics: VS = ±2.5 V
    8. 6.8 Typical Characteristics: VS = 1.9 V, –1.4 V
    9. 6.9 Typical Characteristics: VS = 1.9 V, –1.4 V to ±5 V
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input and ESD Protection
      2. 7.3.2 Anti-Phase Reversal Protection
      3. 7.3.3 Precision and Low Noise
    4. 7.4 Device Functional Modes
      1. 7.4.1 Split-Supply Operation (±1.5 V to ±6.3 V)
      2. 7.4.2 Single-Supply Operation (3 V to 12.6 V)
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Single-Ended-to-Differential Gain of 4 V/V
    2. 8.2 Typical Applications
      1. 8.2.1 Single-Ended to Differential with 2.5-V Output Common-Mode Voltage
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Transimpedance Amplifier Configuration
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 DC Level-Shifting
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

7.1 Overview

The OPA862 is a 44-MHz, single-ended-to-differential amplifier suitable for use in high-input impedance analog front-ends. This device offers a gain-bandwidth product (GBWP) of 400 MHz with a low output-referred voltage noise of 8.3 nV/√ Hz while consuming only 3.1 mA of quiescent current. The OPA862 includes a REF pin for output common-mode voltage control using amplifier 2 and a shutdown pin for low-power mode operation that consumes only 12 µA of quiescent current.

The OPA862 can be configured for a single-ended-to-differential gain of 2 V/V without using any external resistors. The device can be configured in gains other than 2 V/V by using only two external resistors in the feedback loop of amplifier 1 (A1) and requires fewer external gain-setting resistors compared to a fully differential amplifier (FDA). The noninverting input of A1 offers high input impedance (325 MΩ typical) for interfacing single-ended sensors that often have a non-zero output impedance to differential input analog-to-digital converters (ADCs). A combination of large 140-V/µs slew rate, 400-MHz GBWP, and nonlinearity cancellation in the output stages of the two amplifiers results in exceptional distortion and settling performance for 18-bit systems.

The OPA862 includes an internal capacitor CFILT in the feedback circuit of amplifier 2 (A2) that limits the device bandwidth to approximately 44 MHz. Although the individual amplifiers have a GBWP of 200 MHz, because of the architecture of the OPA862, the input and output signal bandwidth must not exceed approximately 44 MHz to achieve good linearity. High GBWP amplifiers generally have high linearity because they can maintain high loop gain. The simple architecture of the OPA862 (as compared to an FDA) has an inherent delay between the outputs VOUT+ and VOUT– that primarily limits the linearity performance versus the high GBWP of the individual amplifiers. The benefit of the CFILT capacitor is that the CFILT filters and minimizes the noise at the output beyond the usable frequency of the OPA862.

The VREF pin can be used to set the output common-mode to a desired value. Section 7.4 describes various configurations that the OPA862 can be used in.