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PDF LH0091 Data sheet ( Hoja de datos )
| Número de pieza | LH0091 | |
| Descripción | LH0091 True RMS to DC Converter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
0 EOUT(DC) e
1
T
T
EIN2(t) dt
0
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 mVg0 05% typ) for decade
x xranges i e 10 mV 100 mV 0 7V 7V etc
Features
Y Low cost
Y True rms conversion
Y 0 5% of reading accuracy untrimmed
Y 0 05% of reading accuracy with external trim
Y Minimum component count
Y Input voltage to g15V peak for VSe g15V
Y Uncommitted amplifier for filtering gain or high crest
factor configuration
Y Military or commercial temperature range
Block and Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
Order Number LH0091CD
See Package D16D
Simplified Schematic
TL H 5694 – 1
Note Dotted lines denote external connections
C1995 National Semiconductor Corporation TL H 5694
TL H 5694 – 2
RRD-B30M115 Printed in U S A
1 page  
Typical Applications (Continued)
Note When converting signals with a crest factor t 2 the LH0091 should
be connected as shown Note that this circuit utilizes a 20k resistor to drop
the input current by a factor of five The frequency response will correspond
to a voltage which is 1 5 eIN
Note that the extra op amp in the LH0091 may be used to build a gain of 5
amplifier to restore the output voltage
Note Response time of the dc output voltage is dominated
by the RC time constant consisting of the total resistance
between pins 9 and 10 and the external capacitor CEX
FIGURE 5 High Crest Factor Circuit
TL H 5694 – 7
Definition of Terms
True rms to dc Converter A device which converts any
signal (ac dc acadc) to the dc equivalent of the rms value
Error is the amount by which the actual output differs from
the theoretical value Error is defined as a sum of a fixed
term and a percent of reading term The fixed term remains
constant regardless of input while the percent of reading
term varies with the input
Total Unadjusted Error The total error of the device with-
out any external adjustments
Bandwidth The frequency at which the output dc voltage
drops to 0 707 of the dc value at low frequency
Frequency for Specified Error The error at low frequency
is governed by the size of the external averaging capacitor
At high frequencies error is dependent on the frequency
response of the internal circuitry The frequency for speci-
fied error is the maximum input frequency for which the out-
put will be within the specified error band (i e frequency for
1% error means the input frequency must be less than 200
kHz to maintain an output with an error of less than 1% of
the initial reading
Crest Factor is the peak value of a waveform divided by
the rms value of the same waveform For high crest factor
signals the performance of the LH0091 can be improved by
using the high crest factor connection
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LH0091.PDF ] | |
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