Description

Low Cost, Low Power, True RMS-to-DC Converter Features: Delivers true rms or average rectified value of ac waveform Fast settling at all input levels Accuracy: ±10 μV ± 0.25% of reading (B grade) Wide dynamic input range  100 μV rms to 3 V rms (8.5 V p-p) full-scale input range  Larger inputs with external scaling Wide bandwidth: 1 MHz for −3 dB (300 mV)  65 kHz for additional 1% error Zero converter dc output offset No residual switching products Specified at 300 mV rms input  Accurate conversion with crest factors up to 10  Low power: 300 μA typical at ±2.4 V  High-Z FET separately powered input buffer RIN ≥ 1012 Ω, CIN ≤ 2 pF  Precision dc output buffer  Wide power supply voltage range Dual: ±2.4 V to ±18 V; single: 4.8 V to 36 V 4 mm × 4 mm LFCSP and 8 mm × 6 mm QSOP packages ESD protected