SBOS293I December   2003  – October 2024 OPA695

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics VS = ±5 V, OPA695ID, OPA695IDBV
    6. 5.6  Electrical Characteristics VS = 5 V, OPA695ID, OPA695IDBV
    7. 5.7  Electrical Characteristics VS = ±5 V, OPA695IDGK
    8. 5.8  Electrical Characteristics VS = 5 V, OPA695IDGK
    9. 5.9  Typical Characteristics: VS = ±5 V, OPA695IDBV, OPA695ID
    10. 5.10 Typical Characteristics: VS = 5 V, OPA695IDBV, OPA695ID
    11. 5.11 Typical Characteristics: VS = ±5 V, OPA695IDGK
    12. 5.12 Typical Characteristics: VS = 5 V, OPA695IDGK
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Wideband Current-Feedback Operation
      2. 6.3.2 Input and ESD Protection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Operating Suggestions
        1. 7.1.1.1 Setting Resistor Values to Optimize Bandwidth
        2. 7.1.1.2 Output Current and Voltage
        3. 7.1.1.3 Driving Capacitive Loads
        4. 7.1.1.4 Distortion Performance
        5. 7.1.1.5 Noise Performance
        6. 7.1.1.6 Thermal Analysis
      2. 7.1.2 LO Buffer Amplifier
      3. 7.1.3 Wideband Cable Driving Applications
        1. 7.1.3.1 Cable Modem Return Path Driver
        2. 7.1.3.2 Arbitrary Waveform Driver
      4. 7.1.4 Differential I/O Applications
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
        1. 7.2.1.1 Saw Filter Buffer
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Design-In Tools
        1. 8.1.1.1 Demonstration Fixtures
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, 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

6.3.1 Wideband Current-Feedback Operation

The OPA695 provides a new level of performance in wideband current-feedback operational amplifiers. The nearly constant ac performance over a wide gain range, along with 5000-V/μs slew rate and ultra-low distortion makes this device an excellent choice for high-speed data acquisition gain stages. While optimized at a gain of +8 V/V (12 dB to a matched 50-Ω load) to give 600-MHz bandwidth, applications from gains of 1 V/V to 40 V/V can be supported. At gains above 20 V/V, the signal bandwidth starts to decrease, but still exceeds 180 MHz up to a gain of 40 V/V (26 dB to a matched 50-Ω load). Single +5-V supply operation is also supported with similar bandwidths but reduced output power capability.

Figure 6-1 shows the dc-coupled, gain of +8 V/V, dual-power supply circuit used as the basis of the ±5-V specifications and typical characteristic curves. The total effective load is 100 Ω || 458 Ω = 82 Ω. The disable control line ( DIS) is typically left open for normal amplifier operation. Assert the disable line low to shut off the OPA695. Figure 6-2 shows the dc-coupled, gain of –8 V/V, dual-power supply circuit used as the basis of the inverting typical characteristic curves. Inverting operation offers several performance benefits. There is no common-mode signal across the input stage; therefore, the distortion performance is slightly improved. In addition to the usual power-supply decoupling capacitors to ground, a 0.01-μF capacitor is included between the two power-supply pins. In practical PCB layouts, this optional added capacitor typically improves the 2nd-harmonic distortion performance by 3 dB to 6 dB for bipolar-supply operation.

OPA695 DC-Coupled, G = +8 V/V, Bipolar Supply Specifications and Test CircuitFigure 6-1 DC-Coupled, G = +8 V/V, Bipolar Supply Specifications and Test Circuit
OPA695 DC-Coupled, G = –8 V/V, Bipolar Supply Specifications and Test CircuitFigure 6-2 DC-Coupled, G = –8 V/V, Bipolar Supply Specifications and Test Circuit