|Category||Data Conversion => ADC/DAC Combo|
|Description||0.1% Accurate Signal Conditioner For Piezoresistive Sensor Compensation|
|Company||Maxim Integrated Products|
|Datasheet||Download MAX1457 datasheet
The is a highly integrated analog-sensor signal processor optimized for piezoresistive sensor calibration and compensation. It includes a programmable current source for sensor excitation, a 3-bit programmable-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 output (FSO), offset TC, FSO TC, and full-span output nonlinearity 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, residual higher-order errors are then compensated using linear interpolation of the first-order coefficients stored in a look-up table (in external EEPROM). The MAX1457 integrates three traditional sensormanufacturing 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 temperature. A general-purpose, uncommitted op amp is also included on-chip to increase the overall circuit gain, or to facilitate the implementation 2-wire, 420mA transmitter. The serial interface is compatible with MicroWireTM and SPITM, 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.
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 30mV/V o Pin-Compatible with MCA7707
PART TEMP. RANGE PIN-PACKAGE +70°C 28 Wide +70°C 32 TQFP to +70°C Dice* Ordering Information continued at end of data sheet. Note: Contact the factory for customized solutions. *Dice are tested = +25°C.
VDD BIAS GENERATOR NBIAS FADJ FOUT VOUT LINDAC FSOTCDAC OTCDAC OFSTDAC FSODAC A=1 LINOUT A=1 FSOTCOUT VBDRIVE A=1 VBBUF
Maxim can customize the MAX1457 for unique requirements. With a dedicated cell library of more than 90 sensor-specific functional blocks, Maxim can quickly provide 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+ AMPSERIAL EEPROM INTERFACE
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.
Supply Voltage, VDD to +6V All other pins....................................(VSS 0.3V) to (VDD + 0.3V) Continuous Power Dissipation (TA +70°C) 28-Pin Wide SO (derate 12.50mW/°C above +70°C)..........1W 32-Pin TQFP (derate 11.1mW/°C above +70°C)...........889mW Operating Temperature Ranges to +125°C Storage Temperature to +150°C Lead Temperature (soldering, 10sec).............................+300°C
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 = +25°C, 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 Time Common-Mode Rejection Ratio Input-Referred Adjustable Offset Range Input-Referred Adjustable Full-Span Output 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 Current-Source Reference Input Voltage Range DAC Voltage Resolution Differential Nonlinearity DAC Resolution 2 IBR VBR VISRC 0.1 VSS + 1.3 VSS VDD - 1.3 VDD V 5k load to VSS or VDD No load VOUT = (VSS 0.25V) to (VDD - 0.25V) Gain to 10Hz, sensor impedance = 5k, full-span output = 4V VSS + 0.25 VSS 0.02 -1.0 (sink) TA = TMIN to TMAX 54 ±50 VDD - 0.25 VDD 0.02 1.0 (source) 60 V/V ppm/°C V mA %FSO CMRR fCLK 63% of final value From VSS to VDD (Note 4) (Note 5) RIN (Notes 2, 3) VDD IDD RBIAS = 400k, fCLK = 100kHz (Note mA M µV/°C %VDD dB mV mV/V SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL-TO-ANALOG CONVERTERS Reference voltage = 5.000V Output filter capacitor = 0.1µF, fCLK 16 µV LSB Bits(VDD = +5V, VSS = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG-TO-DIGITAL CONVERTER ADC Differential Nonlinearity Conversion Time ADC Resolution OUTPUTS (LINDAC, FSOTCDAC) Voltage Swing Current Drive Offset Voltage UNCOMMITTED OP AMP Input Common-Mode Voltage Range Open-Loop Gain Offset Voltage (as unity-gain follower) Output Voltage Swing Output Current Range CMR AV RBIAS = 400k RBIAS = 400k, VIN = 2.5V (no load) 5k load to VSS or VDD No load VOUT = (VSS 0.25V) to (VDD 0.25V) -20 VSS + 0.25 VSS 0.02 -1.0 (sink) VSS VDD - 0.25 VDD 0.02 1.0 (source) VDD V mA VOFS RBIAS = 400k (no load) RBIAS = 400k, VIN = 2.5V, VOUT 2.5V ±20mV (VIN - VOUT) at VIN = 2.5V, RBIAS = 400k (no load) VSS VDD µA mV VBR to 3.5V, fCLK = 100kHz fCLK 160 12 LSB ms Bits
Note 1: Circuit of Figure 5 with current source turned off. This value is adjustable through a bias resistor and represents the IC current consumption. This excludes the 93C66 EEPROM average current, which is approximately at a refresh rate of 3Hz (fCLK = 100kHz). Note 2: Temperature errors for the entire range are compensated together with the sensor errors. Note 3: The sensor and the MAX1457 must always be at the same temperature during calibration and use. Note 4: This is the maximum allowable sensor offset at minimum gain (54V/V). Note 5: 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. Lower sensitivities can be accommodated by using the auxiliary op amp. Higher sensitivities can be accommodated by operating at lower bridge voltages.
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