more detail AD637 datasheet check from
http://www.chinaicmart.com/series-AD6/AD637.html
PRODUCT DESCRIPTION
The AD637 is a complete high accuracy monolithic rms-to-dc converter
that computes the true rms value of any complex waveform. It offers
performance that is unprecedented in integrated
circuit rms-to-dc converters and comparable to discrete and modular
techniques in accuracy, bandwidth and dynamic range. A crest factor
compensation scheme in the AD637 permits
measurements of signals with crest factors of up to 10 with less than
1% additional error. The circuit=92s wide bandwidth permits the
measurement of signals up to 600 kHz with inputs of
200 mV rms and up to 8 MHz when the input levels are above 1 V rms.
AD628 AD628AR AD628-EVAL AD637 AD637AQ AD637B AD637BQ AD637BR
