AD736KR

The AD736KR from Analog Devices is a low-power, precision monolithic true RMS-to-DC converter. It is designed to convert an AC voltage waveform to a DC voltage, providing true RMS, average rectified, or absolute value outputs. The device features a 200 mV rms full-scale input range, which can be extended with an input attenuator. Its high input impedance of 10 TΩ and low input bias current of 25 pA maximum ensure accurate measurements.

The AD736KR boasts high accuracy, with a maximum error of ±0.3 mV ±0.3% of reading for sine wave inputs. It maintains accuracy across a wide range of input waveforms, including variable duty-cycle pulses and triac-controlled sine waves, with signal crest factors up to 5. The wide power supply range of +2.8 V, -3.2 V to ±16.5 V and low power consumption of 200 µA maximum supply current make it ideal for portable multimeters and other battery-powered devices.

This converter is laser trimmed for specified accuracy without external trims. It includes a buffered voltage output for design flexibility. The AD736KR is available in an 8-SOIC surface mount package, suitable for various electronic designs. Its compact size and low cost make it a good option for upgrading older precision rectifier circuits.

Key electrical specifications include a wide operating voltage range and a nominal supply current of 160 µA. The operating temperature range is from 0°C to 70°C. The device is suitable for applications requiring accurate RMS measurements of AC and DC input voltages.