Overview
The AD71056AR, produced by Analog Devices Inc., is a high-accuracy electrical energy metering IC designed to provide precise measurements in various energy metering applications. This IC integrates an on-chip oscillator, eliminating the need for an external crystal or resonator, which reduces the overall system cost. The AD71056AR supports direct interface with shunt resistors and complies with the accuracy requirements of the IEC62053-21 standard. It utilizes proprietary ADCs and DSP to ensure high accuracy over a wide range of environmental conditions and time.
Key Specifications
| Parameter | Value | Unit | Test Conditions/Comments |
|---|---|---|---|
| VDD (Supply Voltage) | 4.75 V min, 5 V ± 5%, 5.25 V max | V | For specified performance |
| IDD (Supply Current) | 5 mA max, Typically 4 mA | mA | VDD = 5 V ± 5% |
| Output High Voltage (VOH) | 4 V min | V | ISOURCE = 5 mA, VDD = 5 V |
| Output Low Voltage (VOL) | 0.5 V max | V | ISINK = 5 mA, VDD = 5 V |
| Frequency Output Error (CF) | ±10 % ideal typ | % | External 2.5 V reference, V1 = 21.2 mV rms, V2 = 116.7 mV rms |
| ADC Resolution | 16-bit Σ-Δ | Oversampling rate of 450 kHz | |
| Package Type | 16-SOIC |
Key Features
- On-chip oscillator as clock source, eliminating the need for an external crystal or resonator.
- High accuracy, supports 50 Hz and 60 Hz systems, and complies with IEC62053-21 standard.
- Direct drive for electromechanical counters and 2-phase stepper motors (F1, F2).
- Proprietary ADCs and DSP for high accuracy over large variations in environmental conditions and time.
- On-chip power supply monitoring and creep protection (no load threshold).
- On-chip reference 2.45 V (20 ppm/°C typical) with external overdrive capability.
- Single 5 V supply, low power consumption (20 mW typical).
- Internal phase matching circuitry and high-pass filter in the current channel to eliminate dc offsets.
Applications
- Electrical energy metering systems requiring high accuracy and reliability.
- Smart meters and advanced metering infrastructure (AMI).
- Industrial power monitoring and control systems.
- Residential and commercial energy measurement solutions.
Q & A
- What is the primary function of the AD71056AR IC?
The AD71056AR is an energy metering IC designed for high-accuracy electrical energy measurement.
- Does the AD71056AR require an external oscillator?
No, the AD71056AR has an on-chip oscillator, eliminating the need for an external crystal or resonator.
- What is the typical supply voltage for the AD71056AR?
The typical supply voltage is 5 V, with a range of 4.75 V to 5.25 V.
- What type of ADCs are used in the AD71056AR?
The AD71056AR uses 16-bit Σ-Δ ADCs with an oversampling rate of 450 kHz.
- How does the AD71056AR handle power supply monitoring?
The IC includes an on-chip power supply monitoring circuit that keeps the device inactive if the supply voltage falls below approximately 4 V.
- What are the key outputs of the AD71056AR?
The key outputs include F1 and F2 for average real power information and CF for instantaneous real power information.
- Does the AD71056AR support phase matching between voltage and current channels?
Yes, the IC includes internal phase matching circuitry to ensure phase alignment between the voltage and current channels.
- What is the purpose of the high-pass filter in the current channel?
The high-pass filter removes any dc component from the current signal, eliminating inaccuracies in real power calculations due to offsets.
- Is the AD71056AR suitable for use in extreme environmental conditions?
Yes, the IC is designed to provide superior stability and accuracy over time and in extreme environmental conditions.
- What standard does the AD71056AR comply with?
The AD71056AR complies with the IEC62053-21 standard for energy metering accuracy.
