True RMS-to-DC Converter Chip

[M.Salim GÜLLÜCE]

Fluke Ölçü aletlerininde kullandığı bir çip.
AD737:
FEATURES:
Computes
-True rms value
-Average rectified value
-Absolute value
Provides
-200 mV full-scale input range (larger inputs with input scaling)
-Direct interfacing with 3½ digit CMOS analog-to-digital converters (ADCs)
-High input impedance: 1012 Ω
-Low input bias current: 25 pA maximum
-High accuracy: ±0.2 mV ± 0.3% of reading
-RMS conversion with signal crest factors up to 5
-Wide power supply range: ±2.5 V to ±16.5 V
-Low power: 25 μA (typical) standby current
-No external trims needed for specified accuracy
The AD737 output is negative going; the AD736 is a positive output-going version of the same basic device




data-sheets/AD737.pdf