ADCs for power-line monitoring

19 August 2009 Analogue, Mixed Signal, LSI

Analog Devices has introduced simultaneous-sampling ADCs (analog-to-digital converters) designed to simplify the design of next-generation power-line monitoring systems.

The need for more efficient utility substations and ‘smart grid’ management is growing as worldwide electricity demand increases. Electric utility companies need power-line monitoring systems to monitor and control energy consumption, cost and quality, as well as to protect expensive equipment from power surges and severe storms.

Also available in six- or four-channel options, the 16-bit, eight-channel AD7606 and 14-bit, eight-channel AD7607 achieve SNR (signal-to-noise ratio) performance of 90 dB. The optional oversampling mode further improves SNR performance, reduces code spread and enhances antialias rejection. Multichannel integration facilitates three-phase current and voltage measurement and neutral monitoring in substation equipment. This enables power-line monitoring systems to observe and manage abnormal events occurring on a power grid, such as electrical faults or short circuits.

The devices operate on a 5 V analog supply, 1,8 to 5 V logic supply, and feature a frontend, antialias filter with high input impedance and input clamp to ±16,5 V. They offer true bipolar analog input ranges of ±5 V and ±10 V that allow for the preservation of phase information while sampling bipolar voltages and currents over a wide dynamic range.

The AD7606 and AD7607 contain on-chip LDOs (low-drop-out regulators), a reference and reference buffer, track-and-hold circuitry, signal conditioning circuitry, on-chip conversion clock, and high-speed parallel and serial interfaces. They also feature low noise, high input impedance (independent of sample rate), signal scaling amplifiers that provide 10 kHz input bandwidth (–3 dB), and 1 MW analog input impedance with only 0,1% gain error and 0,01% offset error.

The ADCs’ frontend, antialias filter has attenuation of approximately 40 dB while sampling at a throughput rate up to 200 kSps. The conversion process and data acquisition are controlled using CONVST signals and an internal oscillator. Two CONVST pins allow the simultaneous sampling of all eight analog inputs or two groups of four analog input channels to allow for phase differences between transformers.

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