Preliminary Product Information

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Cirrus Logic reserves the right to modify this product without notice.

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CS5451A

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

Features

Synchronous Sampling

On-chip 1. 2V Reference (25ppm/°C typ)

Power Supply Configurations:

– VA+ = +3 V; VA- = -2 V; VD+ = +3 V

– Supply tolerances ±10%

Power Consumption

– 20 mW Typical at VD+ = +3 V

Simple Four-wire Serial Interface

Charge Pump Driver output generates

negative power supply.

Ground-Referenced Bipolar Inputs

Description

The CS5451A is a highly integrated Delta-Sigma (

∆Σ)

Analog-to-Digital Converter (ADC) developed for the

Power Measurement Industry. The CS5451A combines

six

∆Σ ADCs, decimation filters, and a serial interface on

a single chip. The CS5451A interfaces directly to a cur-

rent transformer or shunt to measure current, and

resistive divider or transformer to measure voltage. The

product features a serial interface for communication

with a micro-controller or DSP. The product is initialized

and fully functional upon reset, and includes a Voltage

Reference.

ORDERING INFORMATION:

CS5451A-IS

-40

°C to +85°C

28-pin SSOP

VREFIN

VREFOUT

IIN1+

IIN1-

VIN1+

VIN1-

VIN2+

VIN2-

VIN3+

VIN3-

IIN2+

IIN2-

IIN3+

IIN3-

VA+

VD+

AGND

SE

FSO

SDO

SCLK

Voltage

Reference

Serial

Interface

RESET

Decimation Filter

Decimation Filter

Decimation Filter

Decimation Filter

Decimation Filter

Decimation Filter

x1, 20

x1

4th Order

∆Σ Modulator

x1

x1, 20

x1

x1, 20

x1

4th Order

∆Σ Modulator

4th Order

∆Σ Modulator

4th Order

∆Σ Modulator

4th Order

∆Σ Modulator

4th Order

∆Σ Modulator

GAIN

CPD

OWRS

XIN

DGND

VA-

Clock

Pulse Output

Regulator

OCT ‘03

DS635PP1