Rainbow-electronics MAX1464 User Manual download pdf

General Description

The MAX1464 is a highly integrated, low-power, low-

noise multichannel sensor signal processor optimized

for industrial, automotive, and process-control applica-

tions such as pressure sensing and compensation,

RTD and thermocouple linearization, weight sensing

and classification, and remote process monitoring with

limit indication.

The MAX1464 accepts sensors with either single-ended

or differential outputs. The MAX1464 accommodates

sensor output sensitivities from 1mV/V to 1V/V. The

MAX1464 provides amplification, calibration, signal lin-

earization, and temperature compensation that enable

an overall performance approaching the inherent

repeatability of the sensor without requiring any exter-

nal trim components.

Two 16-bit voltage-output DACs and two 12-bit PWMs

can be used to indicate each of the temperature-com-

pensated sensor signals independently, as a sum or

difference signal, or user-defined relationship between

each signal and temperature. Uncommitted op amps

are available to buffer the DAC outputs, drive heavier

external loads, or provide additional gain and filtering.

The MAX1464 incorporates a 16-bit CPU, user-pro-

grammable 4kB of FLASH program memory, 128 bytes

of FLASH user information, one 16-bit ADC, two 16-bit

DACs, two 12-bit PWM digital outputs, four rail-to-rail

op amps, one SPI™-compatible interface, two GPIOs,

and one on-chip temperature sensor.

The MAX1464 operates from a single 5.0V (typ) supply

and is packaged for automotive, industrial, and com-

mercial temperature ranges in a 28-pin SSOP package.

Applications

Pressure Sensor Signal Conditioning

Weight Measurement Systems

Thermocouple and RTD Linearization

Transducers and Transmitters

Process Indicators

Calibrators and Controllers

GMR and MR Magnetic Direction Sensors

Features

♦ Programmable Amplification, Calibration,

Linearization, and Temperature Compensation

♦ Two Differential or Four Single-Ended ADC Input

Channels

♦ Accommodates Sensor Output Sensitivities from

1mV/V to 1V/V

♦ Two DAC/PWM Output Signal Channels

♦ Supports 4–20mA Current Loop Applications

♦ 4kB of FLASH Memory for Code and Coefficients

♦ 128 Bytes of FLASH Memory for User Information

♦ Integrated Temperature Sensing

♦ Flexible Dual Op-Amp Block

♦ Programmable Sensor Input Gain and Offset

♦ Programmable Sensor Sampling Rate and

Resolution

♦ No External Trim Components Required

MAX1464

Low-Power, Low-Noise Multichannel

Sensor Signal Processor

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3579; Rev 0; 2/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*Dice are tested at T

= +25°C, DC parameters only.

Functional Diagram and Detailed Block Diagram appear at

end of data sheet.

SPI is a trademark of Motorola, Inc.

PART TEMP RANGE PIN-PACKAGE

MAX1464CAI 0°C to +70°C 28 SSOP

MAX1464C/W* 0°C to +70°C Die

MAX1464EAI -40°C to +85°C 28 SSOP

MAX1464AAI -40°C to +125°C 28 SSOP

OUT2SM

AMP2M

AMP2P

OUT2LG

REF

INP1

DDF

INM1

INP2

INM2

SSF

GPIO2

GPIO1

SCLK

CKIO

CKSEL

N.C.

OUT1LG

AMP1P

AMP1M

OUT1SM

SSOP

TOP VIEW

MAX1464

Pin Configuration

1 2 3 4 5 6 ... 46 47

Summary of Contents

Page 1 - Sensor Signal Processor

General DescriptionThe MAX1464 is a highly integrated, low-power, low-noise multichannel sensor signal processor optimizedfor industrial, automotive,

Page 2

TEMPERATURE SENSOR OUTPUTvs. TEMPERATUREMAX1464 toc13TEMPERATURE (°C)TEMPERATURE SENSOR OUTPUT (ADC CODE)97.5 125.070.042.515.0-12.50-2000400020008000

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