Overview
The ADE7912, produced by Analog Devices Inc., is a 3-channel, isolated, Sigma-Delta Analog-to-Digital Converter (ADC) designed primarily for polyphase energy metering applications using shunt current sensors. This device features data and power isolation based on Analog Devices' iCoupler® technology, ensuring high reliability and safety in various industrial and energy monitoring systems. The ADE7912 includes two isolated Σ-Δ ADCs, an integrated isoPower® isolated dc-to-dc converter, and an on-chip temperature sensor. It is accessible via a 4-wire SPI serial interface, making it easy to integrate into microcontroller-based systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Analog Input Voltage Range (Current Channel) | −31.25 mV | +31.25 mV | peak | IM pin connected to GNDISO | |
| Analog Input Voltage Range (Voltage Channels) | −500 mV | +500 mV | peak | ||
| Signal-to-Noise Ratio (SNR) - Current Channel | 67 dB | 3 kHz signal bandwidth | |||
| Signal-to-Noise Ratio (SNR) - Voltage Channels | 72 dB | 3 kHz signal bandwidth | |||
| Total Harmonic Distortion (THD) | −83 dBFS | ADC_FREQ = 8 kHz, BW = 3300 Hz | |||
| Supply Voltage | 3.0 V | 3.3 V | 3.6 V | ||
| Operating Temperature | −40°C | +85°C | |||
| Package Type | 20-lead, wide-body SOIC |
Key Features
- Two isolated Σ-Δ ADCs for simultaneous sampling.
- Integrated isoPower® isolated dc-to-dc converter using iCoupler® technology.
- On-chip temperature sensor.
- 4-wire SPI serial interface for easy microcontroller integration.
- Data and power isolation ensuring safety and reliability.
- Support for up to 4 devices clocked from a single crystal or external clock.
- Synchronization of multiple ADE7912/ADE7913 devices.
- UL recognition 5000 V rms for 1 minute per UL 1577 and other safety certifications.
Applications
The ADE7912 is suitable for a variety of applications, including:
- Shunt-based polyphase energy meters.
- Power quality monitoring systems.
- Solar inverters and renewable energy systems.
- Process monitoring and control systems.
- Protective devices in industrial settings.
Q & A
- What is the primary application of the ADE7912?
The ADE7912 is primarily used for polyphase energy metering applications using shunt current sensors. - How many isolated Σ-Δ ADCs does the ADE7912 feature?
The ADE7912 features two isolated Σ-Δ ADCs. - What is the function of the integrated isoPower® dc-to-dc converter?
The integrated isoPower® dc-to-dc converter provides regulated power to the ADCs, eliminating the need for an external isolation block. - What is the signal-to-noise ratio (SNR) of the current channel ADC?
The SNR of the current channel ADC is 67 dB over a 3 kHz signal bandwidth. - What is the operating temperature range of the ADE7912?
The operating temperature range is from −40°C to +85°C. - What type of package does the ADE7912 come in?
The ADE7912 comes in a 20-lead, wide-body SOIC package. - What safety certifications does the ADE7912 have?
The ADE7912 has UL recognition 5000 V rms for 1 minute per UL 1577, CSA Component Acceptance Notice 5A, and IEC 61010-1: 300 V rms certifications. - How is data and power isolation achieved in the ADE7912?
Data and power isolation are achieved using Analog Devices' iCoupler® technology. - What interface is used for communication with the ADE7912?
The ADE7912 uses a 4-wire SPI serial interface for communication. - Can multiple ADE7912 devices be synchronized?
Yes, multiple ADE7912 devices can be synchronized.
