GENERAL DESCRIPTION The AD536A is a complete monolithic integrated circuit that performs true rms-to-dc conversion. It offers performance comparable or superior to that of hybrid or modular units costing much more. The AD536A directly computes the true rms value of any complex input waveform containing ac and dc components. A crest factor compensation scheme allows measurements with 1% error at crest factors up to 7. The wide bandwidth of the device extends the measurement capability to 300 kHz with less than 3 dB errors for signal levels greater than 100 m V. FEATURES True rms-to-dc conversion Laser trimmed to high accuracy ±0.2% maximum error (AD536AK) ±0.5% maximum error (AD536AJ) Wide response capability Computes rms of ac and dc signals 450 kHz bandwidth: V rms > 100 mV 2 MHz bandwidth: V rms > 1 V Signal crest factor of 7 for 1% error dB output with 60 dB range Low power: 1.2 mA quiescent current Single- or dual-supply operation Monolithic integrated circuit −55°C to +125°C operation (AD536AS)
The AD736JRZ is a Low Power True RMS to DC Converter that is laser trimmed to provide a maximum error of ±0.3mV ±0.3% of reading with sine wave inputs. It maintains high accuracy while measuring a wide range of input waveforms, including variable duty-cycle pulses and triac (phase)-controlled sine waves. The 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. The precision, monolithic true RMS to DC converter 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 converter 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.
FEATURES ● OPERATION UP TO 500kHz ● EXCELLENT LINEARITY ±0.01% max at 10kHz FS ±0.05% max at 100kHz FS ● V/F OR F/V CONVERSION ● MONOTONIC ● VOLTAGE OR CURRENT INPUT APPLICATIONS ● INTEGRATING A/D CONVERTER ● SERIAL FREQUENCY OUTPUT ● ISOLATED DATA TRANSMISSION ● FM ANALOG SIGNAL MOD/DEMOD ● MOTOR SPEED CONTROL ● TACHOMETER