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MAX1452 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1452 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 24 page Detailed Description The MAX1452 provides amplification, calibration, and temperature compensation to enable an overall perfor- mance approaching the inherent repeatability of the sensor. The fully analog signal-path introduces no quantization noise in the output signal while enabling digitally controlled trimming with the integrated 16-bit DACs. Offset and span can be calibrated to within ±0.02% of span. The MAX1452 architecture includes a programmable sensor excitation, a 16-step programmable-gain ampli- fier (PGA), a 768-byte (6144 bits) internal EEPROM, four 16-bit DACs, an uncommitted op amp, and an on-chip temperature sensor.The MAX1452 also provides a unique temperature compensation strategy for offset TC and FSOTC that was developed to provide a remarkable degree of flexibility while minimizing testing costs. The customer can select from one to 114 temperature points to compensate their sensor. This allows the lati- tude to compensate a sensor with a simple first order linear correction or match an unusual temperature curve. Programming up to 114 independent 16-bit EEP- ROM locations corrects performance in 1.5°C tempera- ture increments over a range of -40°C to +125°C. For sensors that exhibit a characteristic temperature perfor- mance, a select number of calibration points can be used with a number of preset values that define the temperature curve. In cases where the sensor is at a different temperature than the ASIC, the MAX1452 uses the sensor bridge itself to provide additional tempera- ture correction. The single pin, serial Digital Input-Output (DIO) commu- nication architecture and the ability to timeshare its activity with the sensor’s output signal enables output sensing and calibration programming on a single line by parallel connecting OUT and DIO. The MAX1452 provides a Secure-Lock feature that allows the cus- tomer to prevent modification of sensor coefficients and the 52-byte user definable EEPROM data after the sen- sor has been calibrated. The Secure-Lock feature also provides a hardware override to enable factory rework and recalibration by assertion of logic high on the UNLOCK pin. The MAX1452 allows complete calibration and sensor verification to be performed at a single test station. Once calibration coefficients have been stored in the ASIC, the customer can choose to retest in order to ver- ify performance as part of a regular QA audit or to gen- erate final test data on individual sensors. The MAX1452’s low current consumption and the inte- grated uncommitted op amp enables a 4–20mA output signal format in a sensor that is completely powered from a 2-wire current loop. Frequency response can be user-adjusted to values lower than the 3.2kHz band- width by using the uncommitted op amp and simple passive components. The MAX1452 (Figure 1) provides an analog amplifica- tion path for the sensor signal. It also uses an analog architecture for first-order temperature correction. A digitally controlled analog path is then used for nonlin- ear temperature correction. Calibration and correction is achieved by varying the offset and gain of a pro- grammable-gain-amplifier (PGA) and by varying the sensor bridge excitation current or voltage. The PGA Low-Cost Precision Sensor Signal Conditioner 6 _______________________________________________________________________________________ Pin Description (continued) PIN NAME FUNCTION 9VDDF Positive Supply Voltage for EEPROM. Connect a 0.1 µF capacitor from VDDF to VSS. Connect VDDF to VDD or for improved noise performance connect a 1k Ω resistor to VDD. 10 UNLOCK Secure-Lock Disable. Allows communication to the device. 11 DIO Digital Input Output. DIO allows communication with the device. 12 CLK1M 1MHz Clock Output. The clock can be shut off by a configuration bit. 13 AMPOUT Uncommitted Amplifier Output 14 AMP- Uncommitted Amplifier Negative Input 15 AMP+ Uncommitted Amplifier Positive Input 16 FSOTC Full Span TC Buffered Output |
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