71M6513H-IGT/F Maxim Integrated Products, 71M6513H-IGT/F Datasheet - Page 15
71M6513H-IGT/F
Manufacturer Part Number
71M6513H-IGT/F
Description
IC ENERGY METER 3PH 100-LQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.71M6513H-IGTF.pdf
(104 pages)
Specifications of 71M6513H-IGT/F
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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71M6513/71M6513H
3-Phase Energy Meter IC
A Maxim Integrated Products Brand
DATA SHEET
SEPTEMBER 2011
t
φ
=
⋅
=
⋅
⋅
delay
o
o
360
t
f
360
delay
T
Where f is the frequency of the input signal and t
is the sampling delay between voltage and current.
delay
In traditional meter ICs, sampling is accomplished by using two A/D converters per phase (one for voltage and the other one
for current) controlled to sample simultaneously. Our Single-Converter Technology, however, exploits the 32-bit signal
processing capability of its CE to implement “constant delay” all-pass filters. These all-pass filters correct for the conversion
time difference between the voltage and the corresponding current samples that are obtained with a single multiplexed A/D
converter.
The “constant delay” all-pass filters provide a broad-band delay β that is precisely matched to the difference in sample time
between the voltage and the current of a given phase. This digital filter does not affect the amplitude of the signal, but
provides a precisely controlled phase response. The delay compensation implemented in the CE aligns the voltage samples
with their corresponding current samples by routing the voltage samples through the all-pass filter, thus delaying the voltage
samples by β, resulting in the residual phase error β – Ф. The residual phase error is negligible, and is typically less than ±1.5
milli-degrees at 100Hz, thus it does not contribute to errors in the energy measurements.
Page: 15 of 104
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