ZHCSH60C June   2017  – October 2018 OPA1692

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1. 3 线制驻极体麦克风的前置放大器
      2.      THD + N 与频率之间的关系（3 VRMS，2kΩ 负载）
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions: OPA1692
  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: OPA1692
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Distortion Reduction
      2. 7.3.2 Phase Reversal Protection
      3. 7.3.3 Electrical Overstress
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operating Voltage
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Capacitive Loads
      2. 8.1.2 Noise Performance
      3. 8.1.3 Basic Noise Calculations
      4. 8.1.4 EMI Rejection
      5. 8.1.5 EMIRR +IN Test Configuration
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Other Application Examples
      1. 8.3.1 Two-Wire Electret Microphone Preamplifier
      2. 8.3.2 Battery-Powered Preamplifier for Professional Microphones
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 TINA-TI™（免费软件下载）
        2. 11.1.1.2 DIP 适配器 EVM
        3. 11.1.1.3 通用运算放大器评估模块 (EVM)
        4. 11.1.1.4 智能放大器扬声器特性鉴定板评估模块
        5. 11.1.1.5 TI 高精度设计
        6. 11.1.1.6 WEBENCH滤波器设计器
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 相关链接
    4. 11.4 接收文档更新通知
    5. 11.5 社区资源
    6. 11.6 商标
    7. 11.7 静电放电警告
    8. 11.8 术语表
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.2.3 Application Curves

Table 3 lists the performance of the preamplifier circuit in Figure 60. The total power supply current of the circuit is a combination of the 600 µA consumed by the microphone element itself and the 650 µA power-supply current of the OPA1692. Figure 61 shows the frequency response of the circuit. Comparing the output signal level of the microphone for a 1-Pa input signal level to the A-weighted noise of the preamplifier circuit and microphone determines the SNR of the circuit. For a 1-Pa input sound level, the microphone produces a 14.13 mVRMS signal. The microphone has an SNR of 80 dB, which results in a RMS noise voltage of 1.41 µVRMS. The input-referred A-weighted noise voltage of the preamplifier circuit is 600.6 nVRMS. The microphone and preamplifier noise must be combined as a root sum of squares, which results in a total RMS noise voltage of 1.53 µVRMS and a total circuit SNR of 79.3 dB. By selecting the OPA1692 for this design, this circuit achieves a high level of performance with low power consumption.

Table 3. Comparison of Design Requirements and Results

SPECIFICATION DESIGN REQUIREMENT DESIGN RESULT
Gain 12 V/V or 21.6 dB (120 dB Maximum Input SPL) 11.79 V/V or 21.43 dB
–3-dB bandwidth 20 Hz to 20 kHz 24 Hz to 21 kHz
Signal-to-noise ratio > 75 dB 79.3 dB
Power supply current (microphone and amplifier circuit) < 1.5 mA 1.25 mA
OPA1692 AI_C001_SBOS566.pngFigure 61. Frequency Response of the Low-Noise Preamplifier for 3-Wire Electret Microphones