The Texas Instruments LM135 Temperature Sensor has a thermal coefficient of 10 mV/°C. You want to use the sensor in a digital data acquisition system to measure a temperature range of -20 °C to +120 °C and need to convert the analogue output to a digital signal. a) In order to achieve a resolution of 0.1 °C and assuming that the reference voltage is 0-10 V, how many bits must the ADC have? b) Using your answer to part (a), what will the actual resolution of the system be? c) A Sample-and-Hold device is required before a signal is passed into an ADC. Explain why a Sample-and- Hold is required and using Figure Q3, describe how it functions.

The Texas Instruments LM135 Temperature Sensor has a thermal coefficient of 10 mV/°C. You want to use the sensor in a digital data acquisition system to measure a temperature range of -20 °C to +120 °C and need to convert the analogue output to a digital signal. a) In order to achieve a resolution of 0.1 °C and assuming that the reference voltage is 0-10 V, how many bits must the ADC have? b) Using your answer to part (a), what will the actual resolution of the system be? c) A Sample-and-Hold device is required before a signal is passed into an ADC. Explain why a Sample-and- Hold is required and using Figure Q3, describe how it functions.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Analog to Digital Converters

The analog-to-digital converter (ADC) allows circuits controlled by microprocessors, Arduinos, Raspberry Pi, and various reasonable digital circuits to be connected to the real world. In the real world, analog signals have a continuous stream of information from a variety of sources and sensors capable of measuring sound, light, temperature, or movement, in addition to the many digital systems that interact with their environment by measuring analog signals from those transducers.

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The Texas Instruments LM135 Temperature Sensor has a thermal coefficient of 10 mV/°C. You want to use the
sensor in a digital data acquisition system to measure a temperature range of -20 °C to +120 °C and need to convert
the analogue output to a digital signal.
a) In order to achieve a resolution of 0.1 °C and assuming that the reference voltage is 0-10 V, how many bits
must the ADC have?
b) Using your answer to part (a), what will the actual resolution of the system be?
c) A Sample-and-Hold device is required before a signal is passed into an ADC. Explain why a Sample-and-
Hold is required and using Figure Q3, describe how it functions.
A,
Output
Input o-
CH
Mode
Control O
Figure Q3
S.

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