Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADE7759
Edited by the Electronicstalk Editorial
Team on 26 October 2001
Data convertor is key to solid-state
energy meters
The ADE7759 from Analog Devices is a high-accuracy electrical power measurement data convertor designed to replace the energy measurement function of traditional electromechanical meters.
The ADE7759 from Analog Devices is a high-accuracy electrical power measurement data convertor designed to replace the energy measurement function of traditional electromechanical meters The emerging trend toward electronic energy meters is driven by the demand for timely and precise data readings
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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The ADE7759 enables low system costs in high-current energy meters.
An enhancement of its predecessor, the ADE7756, the ADE7759 incorporates a digital integrator in the current channel to allow direct interface with a di/dt (change-in-current over change-in-time) sensor such as the Rogowski coil.
The Rogowski coil sensor has all the benefits of current transformers (CT), including electrical isolation, high current measuring capability and low power consumption.
In addition, di/dt sensors eliminate dc saturation and are competitively priced against shunt resistors.
The ADE7759's built-in digital integrator eliminates the need for an external analogue integrator and provides long-term stability and precise phase matching between the current and voltage channels.
Pin-to-pin compatibility offers ease of migration from existing meter designs using the ADE7756.
Typical power consumption is only 15mW, and the device is designed to operate over a temperature range of -40 to +85C, while requiring only a single, 5V supply.
As with the other products in the ADE775x family, the ADE7759 provides accurate energy measurement to within 0.1% over a current dynamic range of 1000 to 1.
This accuracy surpasses the 1% accuracy specified by typical electromechanical meters.
The ADE7759 and ADE7756 both provide SAG detection for power supply monitoring, zero crossing for cycle-to-cycle fast calibration and waveform samples for power quality-related information.
Featuring bidirectional communication on a serial port, the ADE7759 device is flexible in supporting different meter architectures with channel-offset correction, phase calibration, and power calibration.
The ADE7759 is priced at $3.11 in 1000-piece quantities and is available in a 20-lead SSOP package.
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