MAX1450 データシートの表示（PDF） - Maxim Integrated

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MAX1450

Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors

Maxim Integrated 

MAX1450

EVALUATION KIT AVAILABLE

Low-Cost, 1%-Accurate Signal Conditioner

for Piezoresistive Sensors

General Description

The MAX1450 sensor signal conditioner is optimized for

piezoresistive sensor calibration and temperature com-

pensation. It includes an adjustable current source for

sensor excitation and a 3-bit programmable-gain amplifier

(PGA). Achieving a total typical error factor within 1% of

the sensor’s inherent repeatability errors, the MAX1450

compensates offset, full-span output (FSO), offset temp-

co, FSO tempco, and FSO nonlinearity of silicon piezore-

sistive sensors via external trimmable resistors, potenti-

ometers, or digital-to-analog converters (DACs).

The MAX1450 is capable of compensating sensors that

display close error distributions with a single temperature

point, making it ideal for low-cost, medium-accuracy appli-

cations. Although optimized for use with popular piezore-

sistive sensors, it may also be used with other resistive

sensor types such as strain gauges.

Customization

Maxim can customize the MAX1450 for unique requirements

including improved power specifications. With a dedicated cell

library consisting of more than 90 sensor-specific functional

blocks, Maxim can quickly provide customized MAX1450

solutions. Contact the factory for additional information.

Applications

●● Piezoresistive Pressure and Acceleration

Transducers and Transmitters

●● Manifold Absolute Pressure (MAP) Sensors

●● Hydraulic Systems

●● Industrial Pressure Sensors

Pin Configuration

TOP VIEW

INP 1

I.C. 2

I.C. 3

SOTC 4

SOFF 5

A1 6

A0 7

OFFTC 8

OFFSET 9

BBUF 10

MAX1450

20 INM

19 VSS

18 BDRIVE

17 ISRC

16 I.C.

15 VDD

14 OUT

13 A2

12 I.C.

11 FSOTRIM

SSOP

Features

●● 1% Sensor Signal Conditioning

●● Corrects Sensor Errors Using Coefficients Stored

in External Trimmable Resistors, Potentiometers, or

DACs

●● Compensates Offset, Offset TC, FSO, FSO TC, and

FSO Linearity

●● Rail-to-Rail Analog Output

●● Programmable Current Source for Sensor Excitation

●● Fast Signal-Path Settling Time (< 1ms)

●● Accepts Sensor Outputs from 10mV/V to 30mV/V

●● Fully Analog Signal Path

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX1450CAP

0°C to +70°C

20 SSOP

MAX1450C/D

0°C to +70°C

Dice*

MAX1450AAP

-40°C to +125°C

20 SSOP

*Dice are tested at TA = +25°C, DC parameters only.

Functional Diagram

FSOTRIM VDD

ISRC

CURRENT

SOURCE

VDD

BDRIVE

INP

INM

+

PGA

-

A=1

MAX1450

A2

A1

A0

OUT

SOTC

SOFF

OFFTC

OFFSET

BBUF

VSS

19-1365; Rev 2; 5/14

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