AD8436JCPZ-WP

The AD8436JCPZ-WP from Analog Devices is a precision, low power, true RMS-to-DC converter designed to compute a precise DC equivalent of the RMS value of AC waveforms. It delivers accurate conversion for complex patterns generated by switch mode power supplies and triacs.

Key features include a wide dynamic input range from 100 μV rms to 3 V rms, with a bandwidth of 1 MHz for -3 dB at 300 mV. The device boasts high accuracy of ±10 μV ± 0.25% of reading (B grade) and a low typical supply current of 300 µA at ±2.4 V. It supports crest factors up to 10.

This converter operates over a wide power supply voltage range, from ±2.4 V to ±18 V for dual supplies or 4.8 V to 36 V for single supplies. It features a high-impedance FET input buffer with R_IN ≥ 10¹² Ω and C_IN ≤ 2 pF. The AD8436JCPZ-WP is available in a compact 20-LFCSP (4x4 mm) package, making it suitable for space-constrained applications.

Its design allows for easy integration with minimal external components, requiring only a single external averaging capacitor for basic operation. The built-in buffer amplifiers provide flexibility for external attenuators or driving low impedance loads.