Analog Devices Improves Monitoring and Protection of Smart Grid Transmission and Distribution Equipment
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The AD777x series incorporates a programmable gain amplifier (PGA) to scale various sensor outputs, allowing system designers to use a common platform for applications with different accuracy requirements and input sensor types, including current transformers, potential transformers, and resistive strings. Additionally, the AD777x series lowers total system cost by eliminating the need for external components such as signal conditioning amplifiers and phase-locked loops (PLLs). The entire AD777x series incorporates sample rate converters that enable the fine adjustment of the sampling rate and maintain coherency to a 0.01Hz change in line frequency over a 50Hz (-15%) to 60Hz (+15%) range. This is a requirement for the IEC61000-4-30 Class A power quality standard.
The new devices also incorporate a number of on-chip diagnostic features that ease the design process for end-equipment safety integrity level (SIL) certification. An additional low-resolution SAR A/D converter channel operates from a separate power supply and provides data for system and chip diagnostics, improving confidence in data integrity and boosting overall system reliability. The AD7771's high dynamic range, coupled with a high sampling rate, enables the reduction of the fast Fourier transform (FFT) noise floor. This enhances the detection of abnormal frequency spurs, which can signal a developing electrical fault, and enables early warning detection and preventative maintenance by power quality measurement equipment.
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AD7770 | ±4 nA | 32 kSPS | Now |
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64-lead |
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AD7771 | ±4 nA | 128 kSPS | Now |
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64-lead |
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AD7779 | ±2 nA | 16 kSPS | Now |
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or
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Novelli
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