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Successive Approximation ADC - Coggle Diagram
Successive Approximation ADC
Definition
Type of ADC using binary search
Compares input voltage to generated reference
Finds closest digital value
Working Principle
Uses DAC + Comparator + SAR logic
DAC generates trial voltages
Comparator decides higher/lower
SAR updates bit register
Conversion Steps
Compare Vin and VDAC
Adjust bits accordingly
Start conversion (MSB = 1)
Repeat until all bits are resolved
Advantages & Applications
Used in ATmega328P (10-bit ADC)
Suitable for real-time embedded systems
High speed, medium resolution
Components
SAR (Successive Approximation Register)
Controls bit testing
DAC (Digital-to-Analog Converter)
Converts SAR trial code to analog voltage
Comparator
Compares Vin with VDAC