CS5451A データシートの表示（PDF） - Cirrus Logic

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CS5451A

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

Cirrus Logic 

CS5451A

3. GENERAL DESCRIPTION

The CS5451A 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 CS5451A combines six ∆Σ modulators and

decimation filters, three channels assigned for cur-

rent input that have programmable input gain am-

plifiers, and three channels assigned for voltage

input.

The CS5451A 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.

3.1 Theory of Operation

The CS5451A is designed to operate from a single

+3V supply and provides a 8 0mVP-P and 1. 6VP-P

input range for the current channels and 1.6 VP-P

range for the voltage channels. These voltages rep-

resent the maximum zero-to-peak voltage levels

that can be presented to the inputs. The CS5451A

is designed to accommodate common mode + sig-

nal levels from VA- to VA+. Figure 2 illustrates the

+3 V

V PHASE +

O ption al

E xte rnal

Reference

1.2 V

VA+

VD+

R E F IN

REFOUT

VIN1+, VIN2+, or VIN3+

VIN1-, VIN2-, or V IN3-

I PHASE

IIN1+, IIN2+, or IIN3+

NOTE: Current input channels

actually measure voltage.

IIN 1-, IIN2-, or IIN3-

AGND

VA-

DGND

-2 V

Figure 2. Typical Connection Diagram

DS635PP1

9

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