Analog Devices ADE7933 Product Info

• 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 T_A = 25°C
• Less than 0.1% error in voltage rms over a dynamic range of 500 to 1 at T_A = 25°C
• Less than 0.25% error in current rms over a dynamic range of 500 to 1 at T_A = 25°C
• Power quality measurements including THD
• Single 3.3 V supply
• Operating temperature: −40°C to +85°C
• Flexible I²C, SPI, and HSDC serial interfaces
• Safety and regulatory approvals
  • UL recognition
    • 5000 V rms for 1 minute per UL 1577
  • CSA Component Acceptance Notice #5A
    • IEC 61010-1: 400 V rms
  • VDE certificate of conformity
    • DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
    • V_IORM = 846 V peak
• Optional isolated (ADE7933/ADE7932) or nonisolated (ADE7923) neutral

The ADE7978, the ADE7933/ADE7932, and ADE7923 form a chipset dedicated to measuring 3-phase electrical energy using shunts as current sensors. The ADE7933/ADE7932 are isolated, 3-channel sigma-delta analog-to-digital converters (Σ-Δ ADCs) for polyphase energy metering applications that use shunt current sensors.

The ADE7923 is a nonisolated, 3-channel Σ-Δ ADC for the neutral line that uses a shunt current sensor. The ADE7932 features two ADCs, and the ADE7933 and ADE7923 feature three ADCs.

One channel is dedicated to measuring the voltage across the shunt when a shunt is used for current sensing. This channel provides a signal-to-noise ratio (SNR) of 67 dB over a 3.3 kHz signal bandwidth. Up to two additional channels are dedicated to measuring voltages, which are usually sensed using resistor dividers.

The unused voltage channels on the neutral ADE7923 can be used for auxiliary voltage measurements. These channels provide an SNR of 75 dB over a 3.3 kHz signal bandwidth. One voltage channel can be used to measure the temperature of the die via an internal sensor. The ADE7933 and ADE7923 include three channels: one current channel and two voltage channels. The ADE7932 includes one current channel and one voltage channel, but is otherwise identical to the ADE7933.

The ADE7933/ADE7932 include isoPower^®, an integrated, isolated dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler^® technology, the dc-to-dc converter provides the regulated power required by the first stage of the ADCs at a 3.3 V input supply. The ADE7933/ADE7932 eliminate the need for an external dc-to-dc isolation block. The iCoupler chip scale transformer technology is us