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MAX1459 fiches techniques PDF

Maxim Integrated - 2-Wire / 4-20mA Smart Signal Conditioner

Numéro de référence MAX1459
Description 2-Wire / 4-20mA Smart Signal Conditioner
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1459 fiche technique
19-1619; Rev 0; 1/00
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2-Wire, 4–20mA
Smart Signal Conditioner
General Description
The MAX1459 highly integrated analog-sensor signal
conditioner is optimized for piezoresistive sensor calibra-
tion and compensation with minimal 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 MAX1459 compensates offset,
offset temperature coefficient (offset TC), full-span output
(FSO), FSO temperature coefficient (FSOTC), and FSO
nonlinearity of silicon piezoresistive sensors.
The MAX1459 calibrates and compensates first-order
temperature errors by adjusting the offset and span of
the input signal through digital-to-analog converters
(DACs), thereby eliminating quantization noise.
The MAX1459 allows temperature compensation via the
external sensor, an internal temperature-dependent
resistor, or a dedicated external temperature transduc-
er. Accuracies better than 0.5% can be achieved with
low-cost external temperature sensors (i.e., silicon tran-
sistor), depending on sensor choice.
Built-in testability features on the MAX1459 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 MAX1459.
Final test operation: Verification of transducer cali-
bration and compensation without removal from the
pretest socket.
Although optimized for use with piezoresistive sensors,
the MAX1459 may also be used with other resistive
sensors (i.e., accelerometers and strain gauges) with
some additional external components.
For custom versions of the MAX1459, see the Customization
section at end of data sheet.
________________________Applications
4–20mA Transmitters
Piezoresistive Pressure and Acceleration
Industrial Pressure Sensors
Load Cells/Wheatstone Bridges
Strain Gauges
Temperature Sensors
Features
o Highly Integrated Sensor Signal Conditioner for
2-Wire, 4–20mA Transmitters
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 +1mV/V to +40mV/V
o Fully Analog Signal Path
o Internal or External Temperature Reference
Compensation
o Automated Pilot Production (Calibration/
Compensation) System Available
o Write Protection for EEPROM Data Security
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1459CAP
0°C to +70°C
20 SSOP
MAX1459C/D
0°C to +70°C
Dice*
MAX1459AAP
-40°C to +125°C 20 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
DIO 3
WE 4
FSOTC 5
AMP+ 6
AMP- 7
AMPOUT 8
TEMPIN 9
ISRC 10
MAX1459
20 VDD
19 NBIAS
18 CK50
17 TEMP2
16 TEMP1
15 INM
14 INP
13 BDRIVE
12 VSS
11 OUT
SSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.

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