MAX1460 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1460

Low-Power, 16-Bit Smart ADC

Maxim Integrated 

MAX1460

EVALUATION KIT AVAILABLE

Low-Power, 16-Bit Smart ADC

General Description

The MAX1460 implements a revolutionary concept in signal

conditioning, where the output of its 16-bit analog- to-digital

converter (ADC) is digitally corrected over the specified

temperature range. This feature can be readily exploited

by industrial and medical market segments, in applications

such as sensors and smart batteries. Digital correction is

provided by an internal digital signal processor (DSP) and

on-chip 128-bit EEPROM containing user-programmed

calibration coefficients. The conditioned output is available

as a 12-bit digital word and as a ratiometric (proportional

to the supply voltage) analog voltage using an on-board

12-bit digital-to-analog converter (DAC). The uncommitted

op amp can be used to filter the analog output, or imple-

ment a 2-wire, 4–20mA transmitter.

The analog front end includes a 2-bit programmablegain

amplifier (PGA) and a 3-bit coarse-offset (CO) DAC,

which condition the sensor’s output. This coarsely cor-

rected signal is digitized by a 16-bit ADC. The DSP uses

the digitized sensor signal, the temperature sensor, and

correction coefficients stored in the internal EEPROM to

produce the conditioned output.

Multiple or batch manufacturing of sensors is supported with a

completely digital test interface. Built-in testability features on

the MAX1460 result in the integration of three traditional sen-

sor-manufacturing operations into one automated process:

●● Pretest: Data acquisition of sensor performance under

the control of a host test computer.

●● Calibration and Compensation: Computation and stor-

age of calibration and compensation coefficients

determined from transducer pretest data.

●● Final Test Operation: Verification of transducer cali-

bration and compensation, without removal from the

pretest socket.

The MAX1460 evaluation kit (EV kit) allows fast evaluation

and prototyping, using a piezoresistive transducer (PRT) and

a Windows®-based PC. The user-friendly EV kit simplifies

small-volume prototyping; it is not necessary to fully under-

stand the test-system interface, the calibration algorithm, or

many other details to evaluate the MAX1460 with a particular

sensor. Simply plug the PRT into the EV kit, plug the EV kit

into a PC parallel port, connect the sensor to an excitation

source (such as a pressure controller), and run the MAX1460

EV kit software. An oven is required for thermal compensation

Functional Diagram appears at end of data sheet.

Pin Configuration appears at end of data sheet.

Windows is a registered trademark of Microsoft Corp.

Features

●● Low-Noise, 400μA Single-Chip Sensor Signal

Conditioning

●● High-Precision Front End Resolves Less than 1μV of

Differential Input Signal

●● On-Chip DSP and EEPROM Provide Digital

Correction of Sensor Errors

●● 16-Bit Signal Path Compensates Sensor Offset and

Sensitivity and Associated Temperature Coefficients

●● 12-Bit Parallel Digital Output

●● Analog Output

●● Compensates a Wide Range of Sensor Sensitivity

and Offset

●● Single-Shot Automated Compensation

Algorithm—No Iteration Required

●● Built-In Temperature Sensor

●● Three-State, 5-Wire Serial Interface Supports

High-Volume Manufacturing

Applications

●● Hand-Held Instruments

●● Piezoresistive Pressure and Acceleration

Transducers and Transmitters

●● Industrial Pressure Sensors and 4–20mA

Transmitters

●● Smart Battery Charge Systems

●● Weigh Scales and Strain-Gauge Measurement

●● Flow Meters

●● Dive Computers and Liquid-Level Sensing

●● Hydraulic Systems

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX1460CCM

0°C to +70°C

48 TQFP

Customization

Maxim can customize the MAX1460 for unique require-

ments. With a dedicated cell library of more than 90 sen-

sor- specific functional blocks, Maxim can quickly provide

customized MAX1460 solutions, including customized

microcode for unusual sensor characteristics. Contact

Maxim for further information.

19-4784; Rev 1; 5/14

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