MAX1458 データシートの表示（PDF） - Maxim Integrated

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MAX1458

1%-Accurate, Digitally Trimmed Sensor Signal Conditioner

Maxim Integrated 

MAX1458

1%-Accurate, Digitally Trimmed

Sensor Signal Conditioner

General Description

The MAX1458 highly integrated analog-sensor signal pro-

cessor is optimized for piezoresistive sensor calibration

and compensation without any external components. It

includes a programmable current source for sensor exci-

tation, a 3-bit programmable-gain amplifier (PGA), a 128-

bit internal EEPROM, and four 12-bit DACs. Achieving a

total error factor within 1% of the sensor’s repeatability

errors, the MAX1458 compensates offset, offset tempera-

ture coefficient, full-span output (FSO), FSO temperature

coefficient (FSOTC), and FSO nonlinearity of silicon

piezoresistive sensors.

The MAX1458 calibrates and compensates first-order

temperature errors by adjusting the offset and span of

the input signal via digital-to-analog converters (DACs),

thereby eliminating quantization noise. Built-in testabil-

ity features on the MAX1458 result in the integration of

three traditional sensor-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

storage (in an internal EEPROM) of calibration and

compensation coefficients computed by the test com-

puter and downloaded to the MAX1458.

●● Final test operation: Verification of transducer cali-

bration and compensation without removal from the

pretest socket.

Although optimized for use with piezoresistive sensors,

the MAX1458 may also be used with other resistive sen-

sors (i.e., accelerometers and strain gauges) with some

additional external components.

Customization

Maxim can customize the MAX1458 for unique require-

ments. With a dedicated cell library consisting of more

than 90 sensor-specific functional blocks, Maxim can

quickly provide customized MAX1458 solutions. Please

contact Maxim for further information.

Applications

●● Piezoresistive Pressure and Acceleration

●● Transducers and Transmitters

●● MAP (Manifold Absolute Pressure) Sensors

●● Hydraulic Systems

●● Industrial Pressure Sensors

Features

●● Medium Accuracy (±1%), Single-Chip Sensor Signal

Conditioning

●● Sensor Errors Trimmed Using Correction Coefficients

Stored in Internal EEPROM—Eliminates the Need for

Laser Trimming and Potentiometers

●● Compensates Offset, Offset-TC, FSO, FSOTC, FSO

Linearity

●● Programmable Current Source (0.1mA to 2.0mA) for

Sensor Excitation

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

●● Accepts Sensor Outputs from 10mV/V to 40mV/V

●● Fully Analog Signal Path

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX1458CAE

0°C to +70°C 16 SSOP

MAX1458C/D

0°C to +70°C Dice*

MAX1458AAE

-40°C to +105°C 16 SSOP

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

Functional Diagram appears at end of data sheet.

Pin Configuration

TOP VIEW

SCLK 1

CS 2

I.C. 3

TEMP 4

FSOTC 5

DIO 6

WE 7

VSS 8

MAX1458

16 LIMIT

15 VDD

14 INP

13 BDRIVE

12 INM

11 I.C.

10 OUT

9 ISRC

SSOP

19-1373; Rev 1; 10/14

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