CS5451 datasheet(7/14 Pages) ETC

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CS5451

DS458PP4

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

PHASE

-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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