(How did we get 1.25V? See next slide ) Output States Discrete Voltage Ranges (V)Ĥ Quantizing The number of possible states that the converter can output is: N=2 n where n is the number of bits in the AD converter Example: For a 3 bit A/D converter, N=2 3 =8. Separate them into a set of discrete states with 1.25V increments. Examples: Light switch can be either on or off Door to a room is either open or closed Real world (lab) is analog Computer (binary) is digital V Bin From: James Mackey Examples of A/D Applications Microphones - take your voice varying pressure waves in the air and convert them into varying electrical signals Strain Gages - determines the amount of strain (change in dimensions) when a stress is applied Thermocouple temperature measuring device converts thermal energy to electric energy Voltmeters Digital Multimeters 2ģ Just what does an A/D converter DO? Converts analog signals into binary words Analog Digital Conversion 2-Step Process: Quantizing - breaking down analog value is a set of finite states Encoding - assigning a digital word or number to each state and matching it to the input signal Step 1: Quantizing Example: You have 0-10V signals. For digital computers, we refer to binary states, 0 and 1. 1Ģ Digital Signals Digital Signals have only two states.
Digital? Examples of ADC Applications Types of A/D Converters Successive Approximation ADC Analog Signals Analog signals directly measurable quantities in terms of some other quantity Examples: Thermometer mercury height rises as temperature rises Car Speedometer Needle moves farther right as you accelerate Stereo Volume increases as you turn the knob. 1 Analog to Digital Converters By: Byron Johns, Danny Carpenter Stephanie Pohl, Harry Bo Marr (unless otherwise marked) Presentation Outline Introduction: Analog vs.