Analog-to-Digital Converters

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Analog-to-Digital Converters

• Lecture L11.2
• Section 11.3

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Analog-to-Digital Converters

• Converts analog signals to digital signals
• 8-bit 0 255
• 10-bit 0 1023
• 12-bit 0 4095
• Successive Approximation
• Flash

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Method of Successive Approximation
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Implementing Successive Approximation
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ADC08318-Bit Serial I/O A/D Converter
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Flash A/D Converter

• Uses analog comparators to convert an analog
  signal to a digital signal in a single clock
  cycle
• n-bit converter requires 2n 1 comparators
• 4-bit converter requires 15 comparators
• 8-bit converter requires 255 comparators
• Or two 4-bit converters plus a D/A converter

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MAX118
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Flash A/D Converter
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MAX118
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ADC0831 Timing
           
 
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Voltmeter Logic Block Diagram
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