Overview
The ADE7751ARS, produced by Analog Devices Inc., is a high-accuracy, fault-tolerant electrical energy measurement IC. It is designed for use in 2-wire distribution systems and exceeds the accuracy requirements specified in the IEC1036 standard. The IC incorporates advanced digital signal processing, with only the ADCs and reference circuit utilizing analog circuitry. This approach ensures superior stability and accuracy over a wide range of environmental conditions and time. The ADE7751ARS features a novel fault detection scheme that monitors both phase and neutral currents, ensuring accurate billing even during fault events.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| Measurement Error (Channels 1 and 2) | 0.1 % | % | One Channel with Full-Scale Signal (±660 mV), Gain = 1, 2, 8, 16 |
| Phase Error between Channels | - | - | Line Frequency = 45 Hz to 55 Hz |
| AVDD Analog Power Supply | 5 V ± 5% | V | Decoupled with a 10 µF capacitor in parallel with a ceramic 100 nF capacitor |
| Analog Input Voltage (V1A, V1B) | ±660 mV | mV | With respect to pin V1N |
| Operating Temperature Range | -40°C to +85°C | °C | - |
| Package Types | 24-lead DIP and SSOP | - | - |
Key Features
- High-accuracy electrical energy measurement with digital signal processing.
- Novel fault detection scheme that monitors phase and neutral currents, ensuring accurate billing during fault events.
- Internal phase matching circuitry to ensure voltage and current channel matching.
- Power supply monitoring circuit on the AVDD supply pin, with reset condition at 4 V.
- Low-frequency outputs (F1 and F2) for real power information, and CF output for instantaneous real power.
- Anticreep protection and high-pass filter select for energy metering applications.
Applications
- Energy metering in 2-wire distribution systems.
- Smart metering systems requiring high accuracy and fault tolerance.
- Industrial and commercial energy monitoring applications.
- Automated billing systems that require precise energy measurement.
Q & A
- What is the primary function of the ADE7751ARS?
The ADE7751ARS is a high-accuracy, fault-tolerant electrical energy measurement IC designed for use in 2-wire distribution systems.
- What is the accuracy of the ADE7751ARS?
The ADE7751ARS has a measurement error of 0.1% over a dynamic range of 500 to 1 for gains of 1, 2, 8, and 16.
- How does the fault detection scheme work?
The IC monitors both phase and neutral currents and indicates a fault when these currents differ by more than 12.5%. Billing continues using the larger of the two currents during a fault event.
- What are the power supply requirements for the ADE7751ARS?
The AVDD supply should be maintained at 5 V ± 5%, decoupled with a 10 µF capacitor in parallel with a ceramic 100 nF capacitor.
- What types of packages are available for the ADE7751ARS?
The ADE7751ARS is available in 24-lead DIP and SSOP packages.
- What is the operating temperature range of the ADE7751ARS?
The operating temperature range is -40°C to +85°C.
- How does the ADE7751ARS ensure phase matching between voltage and current channels?
The IC includes internal phase matching circuitry to ensure that the voltage and current channels are matched.
- What are the low-frequency outputs used for in the ADE7751ARS?
The low-frequency outputs (F1 and F2) provide average real power information and can directly drive an electromechanical counter or interface to an MCU.
- Does the ADE7751ARS have any protection features?
Yes, the ADE7751ARS includes anticreep protection and a power supply monitoring circuit.
- What is the purpose of the CF output in the ADE7751ARS?
The CF output provides instantaneous real power information and is intended for calibration purposes.
