Analog Devices' New Analog-to-Digital Devices Improves Performance of Smart Grid Transmission and Distribution Equipment

By CIOReview | Monday, November 16, 2015

FREMONT, CA: With the introduction of a 24-bit data acquisition system-on-chip (SoC) series- AD7770, AD7771 and AD7779, Analog Devices, a designer and manufacturer of semiconductor products and solutions, steps forward to improve the performance of protection, monitoring, and power quality measurement equipment that manages transmission and distribution of electrical energy within smart grid systems.

The AD777x series is essentially a set of Analog-to-Digital Converters (ADCs). All three devices in the AD777x series offer eight simultaneous sampling channels that measure the output from current and voltage sensors in three-phase power applications and incorporates a programmable gain amplifier (PGA) that allows system designers to use a common platform for applications with different accuracy requirements and input sensor types. Featuring an integrated sample rate converter, the new series products simplifies the design challenge associated with making the power quality equipment compliant with the IEC61000-4-30 Class A standard. It enhances the detection of abnormal frequency spurs that indicates a developing electrical fault to prepare for early warning detection and preventative maintenance by power quality measurement equipment.

To power next-generation smart grid energy infrastructure, AD7770 will enable higher performance and smaller form factor protection relays while the AD7771 will power quality measurement equipment to provide early detection of power grid electrical faults and the AD7779 will ensure fast power-up in circuit breaker equipment. By eliminating the need for external components such as signal conditioning amplifiers and phase-locked loops (PLLs), the AD777x series lowers total system cost.

Each SoC in the series of AD777x implements two different interfaces, one being Data Output Interface while the other being Serial Peripheral Interface (SPI) control Interface. The ADC Data Output interface is dedicated to transmitting the ADC conversion results from each device to the processor. The SPI interface is used to write to and read from the AD7770 configuration registers and for the control and reading of data from the SAR ADC.