LH0091 True RMS to DC Converter
September 1993
LH0091 True RMS to DC Converter
General Description
The LH0091 rms to dc converter generates a dc output
equal to the rms value of any input per the transfer function
E
OUT(DC)
e
Features
Y
Y
Y
0
1
T
E
IN2
(t) dt
T
0
Y
Y
Y
The device provides rms conversion to an accuracy of 0 1%
of reading using the external trim procedure It is possible to
trim for maximum accuracy (0 5 mV
g
0 05% typ) for decade
ranges i e 10 mV
x
100 mV 0 7V
x
7V etc
Y
Y
Low cost
True rms conversion
0 5% of reading accuracy untrimmed
0 05% of reading accuracy with external trim
Minimum component count
Input voltage to
g
15V peak for V
S
e
g
15V
Uncommitted amplifier for filtering gain or high crest
factor configuration
Military or commercial temperature range
Block and Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
Order Number LH0091CD
See Package D16D
TL H 5694 鈥?1
Simplified Schematic
TL H 5694 鈥?2
Note Dotted lines denote external connections
C
1995 National Semiconductor Corporation
TL H 5694
RRD-B30M115 Printed in U S A