AD736 IC-True RMS to DC Converter IC
The AD736 is a low power, precision, monolithic true rms-todc converter. It is laser trimmed to provide a maximum error of ±0.3 mV ± 0.3% of reading with sine wave inputs. Furthermore, it maintains high accuracy while measuring a wide range of input waveforms, including variable duty-cycle pulses and triac (phase)-controlled sine waves. The low cost and small size of this converter make it suitable for upgrading the performance of non-rms precision rectifiers in many applications. Compared to these circuits, the AD736 offers higher accuracy at an equal or lower cost.
Features/Specs:
- Â Converts an ac voltage waveform to a dc voltage and then converts to the true rms, average rectified, or absolute value 200 mV rms full-scale input range (larger inputs with input attenuator)
-  High input impedance: 1012 Ω
- Â Low input bias current: 25 pA maximum
-  High accuracy: ±0.3 mV ± 0.3% of reading
- Â 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: 200 µA maximum supply current
- Â Buffered voltage output
- Â No external trims needed for specified accuracy
-  Related device: the AD737—features a power-down controlwith standby current of only 25 μA; the dc output voltage is negative and the output impedance is 8 kΩ
   Datasheet:AD736 IC-True RMS to DC Converter IC
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