Details, datasheet, quote on part number: MAX1460E
PartMAX1460E
CategoryData Conversion => ADC (Analog to Digital Converters)
DescriptionLow-Power, 16-Bit Smart ADC
CompanyMaxim Integrated Products
DatasheetDownload MAX1460E datasheet
  

 

Features, Applications

o Low-Noise, 400A Single-Chip Sensor Signal Conditioning o High-Precision Front End Resolves Less than 1V of Differential Input Signal o On-Chip DSP and EEPROM Provide Digital Correction of Sensor Errors o 16-Bit Signal Path Compensates Sensor Offset and Sensitivity and Associated Temperature Coefficients o 12-Bit Parallel Digital Output o Analog Output o Compensates a Wide Range of Sensor Sensitivity and Offset o Single-Shot Automated Compensation Algorithm--No Iteration Required o Built-In Temperature Sensor o Three-State, 5-Wire Serial Interface Supports High-Volume Manufacturing

The MAX1460 implements a revolutionary concept in signal conditioning, where the output of its 16-bit analog-to-digital converter (ADC) is digitally corrected over the specified temperature range. This feature can be readily exploited by automotive, industrial, and medical market segments, in applications such as sensors and smart batteries. Digital correction is provided by an internal digital signal processor (DSP) and on-chip 128bit EEPROM containing user-programmed calibration coefficients. The conditioned output is available a 12-bit digital word and as a ratiometric (proportional to the supply voltage) analog voltage using an on-board 12-bit digital-to-analog converter (DAC). The uncommitted op amp can be used to filter the analog output, or implement 2-wire, 420mA transmitter. The analog front end includes a 2-bit programmablegain amplifier (PGA) and a 3-bit coarse-offset (CO) DAC, which condition the sensor's output. This coarsely corrected signal is digitized a 16-bit ADC. The DSP uses the digitized sensor signal, the temperature sensor, and correction coefficients stored in the internal EEPROM to produce the conditioned output. Multiple or batch manufacturing of sensors is supported with a completely digital test interface. Built-in testability features on the MAX1460 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 of calibration and compensation coefficients determined from transducer pretest data. Final Test Operation: Verification of transducer calibration and compensation, without removal from the pretest socket. The MAX1460 evaluation kit (EV kit) allows fast evaluation and prototyping, using a piezoresistive transducer (PRT) and a Windows-based PC. The user-friendly EV kit simplifies small-volume prototyping; it is not necessary to fully understand the test-system interface, the calibration algorithm, or many other details to evaluate the MAX1460 with a particular sensor. Simply plug the PRT into the EV kit, plug the EV kit into a PC parallel port, connect the sensor to an excitation source (such as a pressure controller), and run the MAX1460 EV kit software. An oven is required for thermal compensation.

Hand-Held Instruments Piezoresistive Pressure and Acceleration Transducers and Transmitters Industrial Pressure Sensors and 420mA Transmitters Smart Battery Charge Systems Weigh Scales and Strain-Gauge Measurement Flow Meters Dive Computers and Liquid-Level Sensing Hydraulic Systems Automotive Systems

Maxim can customize the MAX1460 for unique requirements. With a dedicated cell library of more than 90 sensor-specific functional blocks, Maxim can quickly provide customized MAX1460 solutions, including customized microcode for unusual sensor characteristics. Contact Maxim for further information.

Functional Diagram appears at end of data sheet. Pin Configuration appears at end of data sheet. Windows is a registered trademark of Microsoft Corp.

For free samples & the latest literature: http://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, All Outputs.............................Continuous Continuous Power Dissipation (TA +70C) 48-Pin TQFP (derate 12.5mW/C above +70C ).....1000mW Operating Temperature to +70C Storage Temperature to +160C 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 = 0, fXIN TA = TMIN to TMAX, unless otherwise noted.) PARAMETER GENERAL CHARACTERISTICS Supply Voltage (Note 1) Supply Current (Note 2) Throughput Rate ANALOG INPUT Input Impedance Gain Temperature Coefficient (TC) Input-Referred Offset TC Common-Mode Rejection Ratio CMRR From VSS to VDD PGA gain code = 00 PGA Gain PGA Gain PGA gain code = 01 PGA gain code = 10 PGA gain code = 11 CO-DAC code = 111 CO-DAC code = 110 CO-DAC code = 101 Coarse Offset CO-DAC code = 100 CO-DAC code = 000 CO-DAC code = 001 CO-DAC code = 010 CO-DAC code = 011 ADC (Notes 3, 4) Resolution Integral Nonlinearity (Note 5) Input-Referred Noise Output-Referred Noise TEMPERATURE SENSOR (Note 6) Resolution Linearity 260 1.3 LSB/C C 5k input impedance INL PGA gain code = 00, CO-DAC code Bits % nVRMS LSBRMS PGA AND COARSE-OFFSET DAC (Notes VDD V/V RIN M ppm/C nV/C dB VDD IDD During operation Continuous conversion A Hz SYMBOL CONDITIONS MIN TYP MAX UNITS

(VDD = +5V, VSS = 0, fXIN TA = TMIN to TMAX, unless otherwise noted.) PARAMETER OUTPUT DAC (Note 7) DAC Resolution Integral Nonlinearity Differential Nonlinearity UNCOMMITTED OP AMP Op Amp Supply Current Input Common-Mode Range Open-Loop Gain Offset Voltage (as unity-gain follower) Output Voltage Swing Output Current Range Input High Voltage Input Low Voltage Input Hysteresis Input Leakage Input Capacitance DIGITAL OUTPUTS: D[11...0] Output Voltage Low Output Voltage High Three-State Leakage Current Three-State Output Capacitance Output Voltage Low Output Voltage High Three-State Leakage Current Three-State Output Capacitance VOL VOH IL COUT VOL VOH IL COUT ISINK = 500A ISOURCE = 0 (Note 10) ISINK = 500A ISOURCE = 0 (Note A pF VIH VIL VHYST IIN CIN VIN 0 or VDD (Note CMR AV VOS VIN = 2.5V (no load) No load VOUT = (VSS 0.2V) to (VDD 1.0 -30 VSS 0.05 500 VSS VDD 0.05 100 VDD A pF INL DNL 1 0.5 bits LSB SYMBOL CONDITIONS MIN TYP MAX UNITS

DIGITAL INPUTS: START, CS1, CS2, SDIO (Note 8), RESET, XIN (Note 9), TEST
DIGITAL OUTPUTS: SDIO (Note 8), SDO, EOC, OUT

Note 1: EEPROM programming requires a minimum VDD = 4.75V. IDD may exceed its limits during this time. Note 2: This value does not include the sensor or load current. This value does include the uncommitted op amp current. Note that the MAX1460 will convert continuously if REPEAT MODE is set in the EEPROM. Note 3: See the Analog Front-End, including PGA, Coarse Offset DAC, ADC, and Temperature Sensor sections. Note 4: The signal input to the ADC is the output of the PGA plus the output of the CO-DAC. The reference to the ADC is VDD. The plus full-scale input to the ADC is +VDD and the minus full-scale input to the ADC is -VDD. This specification shows the contribution of the CO-DAC to the ADC input. Note 5: See Figure 2 for ADC outputs between to -0.8500. Note 6: The sensor and the MAX1460 must always be at the same temperature during calibration and use. Note 7: The Output DAC is specified using the external lowpass filter (Figure 8). Note 8: SDIO is an input/output digital pin. It is only enabled as a digital output pin when the MAX1460 receives from the test system the commands 8 hex or A hex (Table 4). Note 9: XIN is a digital input pin only when the TEST pin is high. Note 10: Guaranteed by design. Not subject to production testing.


 

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