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Analog Devices Inc. 带有 ADC 驱动器的 ADA4350 模拟前端

亚德诺半导体 带模数转换器驱动器的 ADA4350 模拟前端（AFE）被设计用于直接连接电流模式 传感器，这些应用要求设计人员在极精密增益水平 之间 做出选择，从而使其动态范围达到最大 ，或输出电流与检测的参数成比例。ADA4350 在单个集成电路中集成了 FET 输入放大器、增益切换网络 和模数转换器驱动器。设计人员可通过串行外设接口（SPI）或并行控制逻辑控制所有功能。ADA4350 的切换网络允许设计人员选择多达六个不同的、外部可配置的反馈网络。针对反馈网络使用外部器件，设计人员可以更轻松匹配系统所需的光电检测器或传感器电容。开关设计可最大限度地减少误差来源，这样信号路径中几乎不会增加任何误差。设计人员可将输出驱动器用于单端或差分模式。ADA4350 具有极低的噪声性能（10Hz 时的低频噪声为 90nV/√Hz， 100kHz 时的宽带噪声为 5nV/√Hz）， 是各种光电检测器、高输出阻抗电压 传感器和精密数据采集系统的理想选择。

ADA4350's switching network allows the designer to select up to six different externally configurable feedback networks. Using external components for the feedback network, the designer can more easily match the system to the required photodetector or sensor capacitance. The design of the switches minimizes error sources so that they add virtually no error in the signal path. Designers can use the output driver in either single-ended or a differential mode. With its low-noise performance at low frequencies of 90nV/√Hz at 10Hz and broadband noise of 5nV/√Hz at 100kHz, the ADA4350 is an excellent choice for a wide range of photodetectors, high output impedance voltage sensors, and precision data acquisition systems.

特性

  • Low noise, low input bias current FET input amplifier
    • Very low input bias current: ±0.25pA typical at 25°C
    • Low input voltage noise
      • 92nV/√Hz typical at 10Hz at 5V
      • 5nV/√Hz typical at 100kHz at ±5V
  • Gain bandwidth product: 175MHz
  • Input capacitance
    • 3pF typical, differential mode
    • 2pF typical, common-mode
  • Integrated gain switching
    • Sampling and feedback switch off leakage: ±0.5pA typical
    • Worst-case tON/tOFF times: 105ns typical/65ns typical
  • Integrated analog-to-digital converter (ADC) driver
    • Differential mode and single-ended mode
    • Adjustable output common-mode voltage
    • −5V to +3.8V typical for ±5V supply
    • Wide output voltage swing: ±4.8V minimum for ±5V supply
  • Linear output current: 18mA rms typical for ±5V supply
  • SPI or parallel switch control of all functions
  • Wide operating range: 3.3V to 12V
  • Quiescent current: 8.5mA typical (±5V full system)

应用

  • Current to voltage (I to V) conversions
  • Photodiode preamplifiers
  • Chemical analyzers
  • Mass spectrometry
  • Molecular spectroscopy
  • Laser/LED receivers
  • Data acquisition systems
发布日期: 2015-07-06 | 更新日期: 2022-03-11