Details, datasheet, quote on part number: MAX1478AAE
CategorySensors => Sensor Signal Conditioners
Description1% Accurate, Digitally Trimmed, Rail-to-rail Sensor Signal Conditioner
CompanyMaxim Integrated Products
DatasheetDownload MAX1478AAE datasheet
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Features, Applications

1% Accurate, Digitally Trimmed, Rail-to-Rail Sensor Signal Conditioner

o Medium Accuracy (1%), Single-Chip Sensor Signal Conditioning o Rail-to-Rail Output o Sensor Errors Trimmed Using Correction Coefficients Stored in Internal EEPROM-- Eliminates Laser Trimming and Potentiometers o Compensates Offset, Offset TC, FSO, FSO TC, and FSO Linearity o Programmable Current Source to 2.0mA) for Sensor Excitation o Fast Signal-Path Settling Time o +5V Single Supply o Accepts Sensor Outputs from +40mV/V o Fully Analog Signal Path

The MAX1478 highly integrated, analog sensor signal processor is optimized for piezoresistive sensor calibration and compensation without any 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 digital-to-analog converters (DACs). Achieving a total error factor within 1% of the sensor's repeatability errors, the MAX1478 compensates offset, offset temperature coefficient, full-span output (FSO), FSO temperature coefficient (FSO TC), and FSO nonlinearity of silicon piezoresistive sensors. The MAX1478 calibrates and compensates first-order temperature errors by adjusting the offset and span of the input signal via DACs, thereby eliminating the quantization noise associated with digital signal path solutions. Built-in testability features on the MAX1478 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 MAX1478. Final test operation: Verification of transducer calibration and compensation without removal from the pretest socket. Although optimized for use with piezoresistive sensors, the MAX1478 may also be used with other resistive sensors (i.e., accelerometers and strain gauges) with some additional external components.

To simplify your pressure sensor design, Maxim has developed a fully automated pilot production system that will smooth the difficult transition from prototype to production. Details appear at the end of this data sheet.

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

For high-volume applications, Maxim can customize the MAX1478 for unique requirements. With a dedicated cell library consisting of more than 90 sensor-specific functional blocks, Maxim can quickly provide customized MAX1478 solutions.

Piezoresistive Pressure and Acceleration Transducers and Transmitters Manifold Absolute Pressure (MAP) Sensors Automotive Systems Hydraulic Systems Industrial Pressure Sensors Strain-Gauge Sensors Industrial Temperature Sensors

SSOP Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. 1

For free samples & the latest literature:, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

1% Accurate, Digitally Trimmed, Rail-to-Rail Sensor Signal Conditioner MAX1478

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) 16-Pin SSOP (derate 8.00mW/C above +70C)..........640mW Operating Temperature Range to +125C Storage Temperature to +150C Lead Temperature (soldering, 10sec).............................+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 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 No load VOUT = (VSS 0.25V) to (VDD to 10Hz (gain = 41, source impedance = 5k) VSS 0.05 -0.45 (sink) 500 Selectable in eight steps TA = TMIN to TMAX 41 50 VDD 0.05 0.45 (source) 45 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 (Note V mA SYMBOL CONDITIONS MIN TYP MAX UNITS

(VDD = +5V, VSS = +25C, unless otherwise noted.) PARAMETER CURRENT SOURCE Bridge Current Range Bridge Voltage Swing Reference Input Voltage Range (ISRC) DAC Resolution Differential Nonlinearity Offset DAC Bit Weight Offset TC DAC Bit Weight FSO DAC Bit Weight FSO TC DAC Bit Weight IRO DAC Resolution DAC Bit Weight FSOTC BUFFER Output Voltage Swing Current Drive INTERNAL RESISTORS Current-Source Reference Resistor FSO Trim Resistor Temperature-Dependent Resistor Note 1: Note 2: Note 3: Note 4: Note 5: RISRC RFTC RTEMP Typically 4600ppm/C tempco k No load VFSOTC = 2.5V VSS 0.3 -20 VDD V A Input referred, VDD = 5V (Note 3 9 Bits mV/bit DNL VOUT Code VOUT Code VISRC Code VFSOTC Code DAC reference = VDD = 5.0V DAC reference = VBDRIVE = 2.5V DAC reference = VDD = 5.0V DAC reference = VBDRIVE = 2.5V IBDRIVE VBDRIVE VISRC 0.1 VSS + 1.3 VSS VDD - 1.3 VDD mA V SYMBOL CONDITIONS MIN TYP MAX UNITS

Excludes the sensor or load current. All electronics temperature errors are compensated together with sensor errors. The sensor and the MAX1478 must always be at the same temperature during calibration and use. This is the maximum allowable sensor offset. This is the sensor's sensitivity normalized to its drive voltage, assuming a desired full-span output of 4V and a bridge voltage of 2.5V. Note 6: Bit weight is ratiometric to VDD.


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