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LMT86QDCKTQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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LMT86QDCKTQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 16 page +2.7V to +5.5V GND OUT VDD CBP RMUX Input Pin CFILTER LMT86 CSAMPLE Reset Sample CMUX Simplified Input Circuit of SAR Analog-to-Digital Converter RSS LMT86 VOUT VDD SHUTDOWN Any logic device output R1 4.1V R3 R2 0.1 PF U3 LM4040 R4 VOUT V+ VT VTemp + - U1 LMT86 VDD U2 (High = overtemp alarm) VT1 VT2 VTEMP VOUT VT1 = R1 + R2||R3 (4.1)R2 VT2 = R2 + R1||R3 (4.1)R2 LMT86, LMT86-Q1 SNIS169A – MARCH 2013 – REVISED JUNE 2013 www.ti.com APPLICATION CIRCUITS Figure 13. Celsius Thermostat Figure 14. Conserving Power Dissipation with Shutdown Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the ADC charges the sampling cap, it requires instantaneous charge from the output of the analog source such as the LMT86/LMT86-Q1 temperature sensor and many op amps. This requirement is easily accommodated by the addition of a capacitor (CFILTER). The size of CFILTER depends on the size of the sampling capacitor and the sampling frequency. Since not all ADCs have identical input stages, the charge requirements will vary. This general ADC application is shown as an example only. Figure 15. Suggested Connection to a Sampling Analog-to-Digital Converter Input Stage 10 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: LMT86 LMT86-Q1 |
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