AD736KNZ

AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed to provide a maximum error of ±0.3mV ± 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. It can compute the rms value of both ac and dc input voltages. It can also be operated as an ac-coupled device by adding one external capacitor. In this mode, this device can resolve input signal levels of 100μV rms or less, despite variations in temperature or supply voltage. High accuracy is also maintained for input waveforms with crest factors of 1 to 3. In addition, crest factors as high as 5 can be measured (introducing only 2.5% additional error) at the 200mV full-scale input level.

• RMS conversion with signal crest factors upto 5
• Buffered voltage output, no external trims needed for specified accuracy
• Output offset voltage is ±0.1mV typical at (25°C ± 5V)
• Input bias current is 1pA typical at (25°C ± 5V)
• ±3dB bandwidth is 5KHz typical at (25°C ± 5V)
• Operating voltage range from 2.8V to 16.5V
• Quiescent current is 160µA typical at (25°C ± 5V)
• Peak transient input is ±0.9V minimum at (25°C ± 5V)
• Operating temperature is 0°C to +70°C
• Package style is 8-lead PDIP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party