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lecNew-12-ADC

lecNew-12-ADC - WPI ECE2801 Foundations of Embedded...

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WPI ECE2801 Foundations of Embedded Computer Systems Lecture 12: Analog-to-Digital Converter
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EE2801: Foundations of Embedded Systems Lecture 12 MSP430F449 Peripherals 6 Digital I/O Ports FLL/System Clock module 4 Timers ADC (8 channel 12 BIT) Op amps 2 USARTs (SPI) Comparator Flash memory controller LCD Controller DMA controller Hardware Multiplier
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ADC: Analog-to-Digital Converter Converts continuous/analog signals to discrete/digital numbers. Typically, it converts an input analog voltage to a digital number. Full scale range : max or total range of analog values that can be represented V REF+ = 3v, V REF- = 0v: the full scale range is V REF+ - V REF- = 3v. Dynamic range : ratio of the largest to the smallest values that can be measured, usually expressed in decibels (dB) EE2801: Foundations of Embedded Systems Lecture 12 dB dB bit bits DR k k 72.24 ) 2 log( 20 ) 2 log( 20 ) 1 2 log( 20 12
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