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General Description

The MAX1458 highly integrated analog-sensor signal

processor is optimized for piezoresistive sensor calibra-

tion and compensation without any external compo-

nents. It includes a programmable current source for

sensor excitation, 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 compen-

sates offset, offset temperature 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 testabili-

ty 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

computer 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

sensors (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

Automotive Systems

Hydraulic Systems

Industrial Pressure Sensors

Features

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

Signal Conditioning

o Sensor Errors Trimmed Using Correction

Coefficients Stored in Internal EEPROM—

Eliminates the Need for Laser Trimming and

Potentiometers

o Compensates Offset, Offset-TC, FSO, FSOTC,

FSO Linearity

o Programmable Current Source (0.1mA to 2.0mA)

for Sensor Excitation

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

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

o Fully Analog Signal Path

1%-Accurate, Digitally Trimmed

Sensor Signal Conditioner

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

SCLK

LIMIT

INP

BDRIVE

INM

I.C.

OUT

ISRC

TOP VIEW

MAX1458

SSOP

CS

I.C.

DIO

TEMP

FSOTC

WE

19-1373; Rev 0; 5/98

PART

MAX1458CAE

MAX1458C/D

MAX1458AAE

-40°C to +125°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 SSOP

Dice*

16 SSOP

*

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information