What the AD7755AAN is and where it fits
The AD7755AAN is a single-phase energy metering IC from Analog Devices. It outputs a frequency proportional to the real power, directly driving a stepper motor or microcontroller counter. The 0.1% measurement error meets utility-grade metering requirements. The 390 kΩ input impedance sets the voltage divider ratio for the mains sensing network. The 2 mA supply current allows a simple capacitive dropper or small transformer for the power supply.
Lifecycle and sourcing reality
It is not RoHS compliant, so designs requiring lead-free assembly should consider the AD7755AARSRL surface-mount variant or verify exemption applicability.
