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CS5451 Fiches technique(PDF) 7 Page - List of Unclassifed Manufacturers

No de pièce CS5451
Description  SIX CHANNEL DELTA SIGMA ANALOG TO DIGITAL CONVERTER
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CS5451
DS458PP4
7
2. GENERAL DESCRIPTION
The CS5451 is designed for 3-phase power meter
applications and interfaces to a current transform-
ers or shunt to measure current, and a resistive di-
vider or transformer to measure voltage.
The CS5451 combines six
∆Σ modulators and dec-
imation filters, three channels assigned for current
input that have programmable input gain amplifi-
ers, and three channels assigned for voltage input.
The CS5451 includes six 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 CS5451 is designed to operate from a single
+3V supply and provides a ±40 mV and ±800 mV
input range for the current channels and ±800 mV
range for the voltage channels. These voltages rep-
resent the maximum zero-to-peak voltage levels
that can be presented to the inputs. The CS5451 is
designed to accommodate common mode + signal
levels from VA- to VA+. Figure 2 illustrates the
CS5451 typical inputs and power supply connec-
tions.
VA+
VD+
VIN1+, VIN2+, or VIN3+
VIN1-, VIN2-, or VIN3-
IIN1+, IIN2+, or IIN3+
IIN1-, IIN2-, or IIN3-
AGND
DGND
REFIN
REFOUT
Optional
External
Reference
V
PHASE
+
I
-2 V
PHASE
VA-
+3 V
1.2 V
NOTE: Current input channels
actually measure voltage.
Figure 2. Typical Connection Diagram


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