Details, datasheet, quote on part number: MAX1459C/D
PartMAX1459C/D
CategorySensors => Sensor Signal Conditioners
Description2-wire, 4-20ma Smart Signal Conditioner
CompanyMaxim Integrated Products
DatasheetDownload MAX1459C/D datasheet
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Features, Applications

o Highly Integrated Sensor Signal Conditioner for 2-Wire, 420mA 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 to 2.0mA) for Sensor Excitation o Fast Signal-Path Settling Time (1ms) o Accepts Sensor Outputs from +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

The MAX1459 highly integrated analog-sensor signal conditioner is optimized for piezoresistive sensor calibration and compensation with minimal external components. 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 transducer. Accuracies better than 0.5% can be achieved with low-cost external temperature sensors (i.e., silicon transistor), 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 calibration 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.
PART MAX1459CAP MAX1459C/D TEMP. RANGE to +70C PIN-PACKAGE 20 SSOP Dice*

+125C 20 SSOP *Dice are tested +25C, DC parameters only. Functional Diagram appears at end of data sheet.

SCLK CS 2 DIO WE 4 FSOTC 5 AMP+ 6 AMP- 7 AMPOUT 8 TEMPIN 9 ISRC 10 20 VDD 19 NBIAS 18 CK50

420mA Transmitters Piezoresistive Pressure and Acceleration Industrial Pressure Sensors Load Cells/Wheatstone Bridges Strain Gauges Temperature Sensors

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.

Supply Voltage, VDD to +6V All Other Pins...................................(VSS 0.3V) to (VDD + 0.3V) Short-Circuit Duration, FSOTC, OUT, BDRIVE...........Continuous Continuous Power Dissipation (TA +70C) 20-Pin SSOP (derate 8.00mW/C above +70C)..........640mW Operating Temperature Ranges to +125C Storage Temperature to +150C Lead Temperature (soldering, 10s).................................+300C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

(VDD = +5V, VSS = +25C, unless otherwise noted.) PARAMETER GENERAL CHARACTERISTICS Supply Voltage Supply Current ANALOG INPUT (PGA) Input Impedance Input-Referred Offset Tempco Amplifier Gain Nonlinearity Output Step Response Common-Mode Rejection Ratio Input-Referred Adjustable Offset Range Input-Referred Adjustable FullSpan Output (FSO) Range ANALOG OUTPUT (PGA) Differential Signal Gain Range Minimum Differential Signal Gain Differential Signal Gain Tempco Output Voltage Swing Output Current Range Output Noise CURRENT SOURCE Bridge Current Range Bridge Voltage Swing Reference Input Voltage Range (ISRC) IBDRIVE VBDRIVE VISRC IBDRIVE 2mA 0.1 VSS + 1.3 VSS VDD - 1.3 VDD mA V Selectable in eight steps TA = TMIN to TMAX TA = TMIN to TMAX No load 10k load VOUT = (VSS 0.25V) to (VDD to 10Hz (gain = 41, source impedance = 5k) VSS + 0.05 VSS 0.25 -0.45 (sink) +41 50 VDD - 0.05 VDD 0.25 0.45 (source) +44 V/V ppm/C V mA VRMS CMRR 63% of final value From VSS to VDD At minimum gain (Note 4) (Note 5) RIN (Notes +40 M V/C %VDD dB mV mV/V VDD IDD RNBIAS = 402k, VDD = 5.0V (Note V mA SYMBOL CONDITIONS MIN TYP MAX UNITS

(VDD = +5V, VSS = +25C, unless otherwise noted.) PARAMETER DAC Resolution Differential Nonlinearity Offset DAC Bit Weight Offset TC DAC Bit Weight FSO DAC Bit Weight FSOTC DAC Bit Weight IRO DAC Resolution DAC Bit Weight FSOTC BUFFER (FSOTC Pin) Output Voltage Swing Current Drive INTERNAL RESISTORS Current Source Reference Resistor FSO Trim Resistor Temperature-Dependent Resistor AUXILIARY OP AMP Input Common-Mode Range Open-Loop Gain Offset Voltage (as unity-gain follower) Output Swing Output Current CMR AV VIN VDD/2 No load -30 VSS 0.05 1 VSS 60 30 VDD - 0.05 VDD V mA RISRC RFTC RTEMP k No load, = 5V VFSOTC V A Input referred, VDD = 5V (Note 3 9 Bits mV/bit DNL VOUT Code VOUT Code VISRC Code VFSOT Code DAC reference = VDD = 5.0V DAC reference = VBDRIVE = 2.5V DAC reference = VDD = 5.0V DAC reference = VBDRIVE = 2.5V SYMBOL CONDITIONS MIN TYP MAX UNITS Bits LSB mV/bit DIGITAL-TO-ANALOG CONVERTERS


 

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