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CS5471 Arkusz danych(PDF) 7 Page - Cirrus Logic

Numer części CS5471
Szczegółowy opis  DUAL CHANNEL DELTA SIGMA ANALOG TO DIGITAL CONVERTER
Download  14 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS5471
7
2. GENERAL DESCRIPTION
The CS5471 is designed for single-phase power
meter applications and interfaces to a current trans-
formers or shunt to measure current, and a resistive
divider or transformer to measure voltage.
The CS5471 combines two
∆Σ modulators and
decimation filters, one channel assigned for current
input that has programmable input gain amplifiers,
and one channel assigned for voltage input.
The CS5471 includes two decimation filters that
output data at a 2000 Hz or 4000 Hz output word
rate (OWR) when the input frequency at XIN =
4.096 MHz.
The device outputs data on a serial output port.
2.1
Theory of Operation
The CS5471 is designed to operate from a single
+3V supply and provides a ±40 mV and ±800 mV
input range for the current channel and ±800 mV
range for the voltage channel. These voltages rep-
resent the maximum zero-to-peak voltage levels
that can be presented to the inputs. The CS5471 is
designed to accommodate common mode + signal
levels from VA- to VA+. Figure 2 illustrates the
CS5471 typical inputs and power supply connec-
tions.
2.2
Performing Measurements
The converter outputs are transferred in 16-bit
signed (two’s complement) data formats as a per-
VA+
VD+
VIN +
VIN-
IIN+
IIN -
AGND
DGND
REFIN
REFOUT
Optional
External
Reference
V
PHASE
+
I
-2 V
PHASE
VA-
+3 V
1.2 V
NOTE: Current input channel
actually measures voltage.
Figure 2. Typical Connection Diagram


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