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MAX1457

Description
0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation
File Size97KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1457 Overview

0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation

19-1342; Rev 1; 8/98
IT
TION K
VALUA
E
BLE
AVAILA
0.1%-Accurate Signal Conditioner
for Piezoresistive Sensor Compensation
________________General Description
The MAX1457 is a highly integrated analog-sensor sig-
nal processor optimized for piezoresistive sensor cali-
bration and compensation. It includes a programmable
current source for sensor excitation, a 3-bit program-
mable-gain amplifier (PGA), a 12-bit ADC, five 16-bit
DACs, and an uncommitted op amp. Achieving a total
error factor within 0.1% of the sensor’s repeatability
errors, the MAX1457 compensates offset, full-span out-
put (FSO), offset TC, FSO TC, and full-span output non-
linearity of silicon piezoresistive sensors.
The MAX1457 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. If needed, resid-
ual higher-order errors are then compensated using lin-
ear interpolation of the first-order coefficients stored in
a look-up table (in external EEPROM).
The MAX1457 integrates 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 external EEPROM) of calibration and compensation
coefficients determined from transducer pretest data.
Final Test: Verification of transducer calibration and
compensation, without removal from a pretest socket.
Analog outputs are provided for both pressure and tem-
perature. A general-purpose, uncommitted op amp is also
included on-chip to increase the overall circuit gain, or to
facilitate the implementation of a 2-wire, 4–20mA transmit-
ter. The serial interface is compatible with MicroWire™
and SPI™, and directly connects to an external EEPROM.
Additionally, built-in testability features of the MAX1457
facilitate manufacturing and calibration of multiple sensor
modules, thus lowering manufacturing cost.
Although optimized for use with piezoresistive sensors,
the MAX1457 may also be used with other resistive
sensor types (i.e., accelerometers and strain gauges)
with the addition of a few external components.
V
DD
ISRC
____________________________Features
o
High Accuracy (within ±0.1% of sensor’s
repeatable errors)
o
Compensates Offset, Offset TC, FSO, FSO TC,
Temperature/Pressure Nonlinearity
o
Rail-to-Rail
®
Analog Output for Calibrated,
Temperature-Compensated Pressure
Measurements
o
Programmable Sensor Excitation Current
o
SPI/MicroWire-Compatible Serial Interface
o
Fast Signal-Path Settling Time (<1ms)
o
Accepts Sensor Outputs from 5mV/V to 30mV/V
o
Pin-Compatible with MCA7707
MAX1457
_______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1457CWI
0°C to +70°C
28 Wide SO
MAX1457CCJ
0°C to +70°C
32 TQFP
MAX1457C/D
0°C to +70°C
Dice*
Ordering Information continued at end of data sheet.
Note:
Contact the factory for customized solutions.
*Dice
are tested at T
A
= +25°C.
Pin Configurations appear at end of data sheet.
Functional Diagram
V
DD
BIAS
GENERATOR
NBIAS
FADJ
FOUT
VOUT
LINDAC
FSOTCDAC
OTCDAC
OFSTDAC
FSODAC
A=1
LINOUT
A=1
FSOTCOUT
V
BDRIVE
A=1
VBBUF
MAX1457
OSCILLATOR
BDRIVE
INP
PGA
INM
V
DD
AGND
16-BIT DAC - FSO
16-BIT DAC - OFFSET
16-BIT DAC - OFFSET TC
16-BIT DAC - FSO TC
16-BIT DAC - FSO LINEARITY
V
DD
V
SS
12-BIT ADC
_______________________Customization
Maxim can customize the MAX1457 for unique require-
ments. With a dedicated cell library of more than 90
sensor-specific functional blocks, Maxim can quickly pro-
vide customized MAX1457 solutions. Contact Maxim for
additional information.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SPI is a trademark of Motorola, Inc.
MicroWire is a trademark of National Semiconductor Corp.
MCS
ECS
ECLK
EDI
EDO
LINDACREF
AMP+
AMP-
SERIAL
EEPROM
INTERFACE
AMPOUT
V
SS
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.

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Is it Rohs certified? - incompatible incompatible - incompatible incompatible
Parts packaging code - SOIC DIE - QFP SOIC
package instruction - SOP-28 DIE - TQFP-32 SOP-28
Contacts - 28 28 - 32 28
Reach Compliance Code - _compli _compli - _compli _compli
Analog Integrated Circuits - Other Types - ANALOG CIRCUIT ANALOG CIRCUIT - ANALOG CIRCUIT ANALOG CIRCUIT
JESD-30 code - R-PDSO-G28 R-XUUC-N - S-PQFP-G32 R-PDSO-G28
JESD-609 code - e0 e0 - e0 e0
Humidity sensitivity level - 1 1 - 1 1
Number of functions - 1 1 - 1 1
Number of terminals - 28 28 - 32 28
Maximum operating temperature - 70 °C 70 °C - 70 °C 125 °C
Package body material - PLASTIC/EPOXY UNSPECIFIED - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SOP DIE - TQFP SOP
Package shape - RECTANGULAR RECTANGULAR - SQUARE RECTANGULAR
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Peak Reflow Temperature (Celsius) - 240 240 - 245 240
Certification status - Not Qualified Not Qualified - Not Qualified Not Qualified
Maximum supply voltage (Vsup) - 5.5 V 5.5 V - 5.5 V 5.5 V
Minimum supply voltage (Vsup) - 4.5 V 4.5 V - 4.5 V 4.5 V
Nominal supply voltage (Vsup) - 5 V 5 V - 5 V 5 V
surface mount - YES YES - YES YES
Temperature level - COMMERCIAL COMMERCIAL - COMMERCIAL AUTOMOTIVE
Terminal surface - Tin/Lead (Sn85Pb15) TIN LEAD - Tin/Lead (Sn85Pb15) Tin/Lead (Sn85Pb15)
Terminal form - GULL WING NO LEAD - GULL WING GULL WING
Terminal location - DUAL UPPER - QUAD DUAL
Maximum time at peak reflow temperature - 20 NOT SPECIFIED - NOT SPECIFIED 20
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