CS5451 Просмотр технического описания (PDF) - Cirrus Logic

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CS5451

Six-Channel Delta-Sigma Analog-to-Digital Converter

Cirrus Logic 

CS5451

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.

+3 V

V PHASE +

Optional

External

Reference

1.2 V

VA+

VD+

REFIN

REFOUT

VIN1+, VIN2+, or VIN3+

VIN1-, VIN2-, or VIN3-

I PHASE

IIN1+, IIN2+, or IIN3+

NOTE: Current input channels

actually measure voltage.

IIN1-, IIN2-, or IIN3-

AGND

VA-

DGND

-2 V

Figure 2. Typical Connection Diagram

DS458PP4

7

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