Description

The AD736ARZ is a monolithic, low power, precision true RMS-to-DC converter designed to provide maximum accuracy. It delivers high accuracy measurements while processing a wide range of input waveforms, including variable duty-cycle pulses and triac-controlled sine waves. The AD736ARZ is laser trimmed to provide a maximum error of ±0.3 mV ± 0.3% of reading with sine wave inputs.

Specifications and features

• Converts AC voltage waveform to DC voltage
• 200 mV RMS full-scale input range (larger inputs with input attenuator)
• High input impedance: 1012 Ω
• Low input bias current: 25 pA maximum
• High accuracy: ±0.3 mV ± 0.3% of reading
• RMS conversion with signal crest factors up to 5
• Wide power supply range: +2.8 V, −3.2 V to ±16.5 V
• Low power consumption: 200 µA maximum supply current
• Buffered voltage output
• No external trims needed for specified accuracy
• Related device: the AD737—features a power-down control with standby current of only 25 μA; the dc output voltage is negative and the output impedance is 8 kΩ

Application Scenarios

The AD736ARZ is suitable for upgrading the performance of non-RMS precision rectifiers in various applications due to its low cost and small size.

Comparison

• High accuracy
• Works with a wide range of input waveforms

• None identified