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Analog Devices Inc. ADE7932/ADE7933 隔离式、Sigma Delta 模数转换器

Analog Devices ADE7933/ADE7932 是隔离式、Σ-Δ型模数转换器(Σ-Δ ADC)，针对使用分流电流传感器的三相电能计量应用而设计。ADE7932 带 2 个 24 位模数转换器，而 ADE7933 有三个 24 位 模数转换器。其中一个通道在分流器用于电流感应时专门用来测量该分流器上的电压。该通道在 3.3kHz 信号带宽内提供 67dB 的信噪比(SNR)。最多两个额外的通道专用于测量电压，通常采用电阻分压器进行检测。这些通道在 3.3kHz 信号带宽内提供达 75dB 的 SNR。一条电压通道可用于芯片温度的测量，测量时使用内部传感器。该直流-直流转换器基于 Analog Devices 公司的 iCoupler® 技术，输入电源达 3.3V 时提供模数转换器第一级所需的调节电源。ADE7933/ADE7932 无需外部直流-直流隔离模块。利用 iCoupler 芯片级变压器技术，能够隔离模数转换器第一级和第二级之间的逻辑信号。因此，可提供小尺寸、完全隔离的解决方案。

Based on proprietary iCoupler® technology, this DC-to-DC converter provides the regulated power required by the first stage of the ADCs at a 3.3V input supply. The ADE7933/ADE7932 eliminate the need for an external DC-to-DC isolation block. The iCoupler chip scale transformer technology is used to isolate the logic signals between the first and second stages of the ADC. The result is a small form factor, total isolation solution.

特性

  • Enables shunt current sensors in polyphase energy meters
  • Immune to magnetic tampering
  • Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, IEC 62053-23, ANSI C12.20, and IEEE 1459 standards
  • Compatible with 3-phase, 3- or 4-wire (delta or wye) meters and other 3-phase services
  • Computes active, reactive, and apparent energy on each phase and on the overall system
  • Less than 0.2% error in active and reactive energy over a dynamic range of 2000 to 1 at TA = 25°C
  • Less than 0.1% error in voltage rms over a dynamic range of 500 to 1 at TA = 25°C
  • Power quality measurements including THD
  • Single 3.3V supply

应用

  • Shunt-based polyphase meters
  • Power quality monitoring
  • Solar inverters
  • Process monitoring
  • Protective devices
  • Isolated sensor interfaces
发布日期: 2014-04-14 | 更新日期: 2022-03-11