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 It is an Extra bit Included with a binary Message to Make the Number of 1’s either Odd or Even.  A Parity bit is used for the Purpose of Detecting Errors during Transmissions of binary Information. PARITY GENERATOR  A Parity Generator is a Combinational Logic Circuit that Generates the Parity bit in the Transmitter. Name Chip select Read Write Clock IN Interrupt Vin(+) Vin(-) Analog Ground Vref/2 Digital Ground D7 D6 D5 D4 D3 D2 D1 D0 Clock R Vcc Used with Clock IN pin when internal clock source is used Supply voltage 5V Output pin Goes low when conversion is complete Analog non-inverting input Analog inverting Input normally ground Ground(0V) Input pin sets the reference voltage for analog input Ground(0V) By default grounded Input pin High to low pulse brings the data from internal registers to the output pins after conversion Input pin Low to high pulse is given to start the conversion Clock Input pin to give external clock.

PIN DESCRIPTION Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20įunction Activates ADC Active low used if more than 1 ADC module is used.  ADC0804 requires up to 100 µs to convert an analog input voltage into a digital output code. There are many faster ADCs available with more resolution, this device is ideal for applications that do not require a high degree of accuracy.  A common, low-cost ADC, compatible with a wide range of microprocessors.  When Vref = 5V, for every 19.60mV of analog value there will be rise of one bit on digital side (Step size)  Available in 20-pin PDIP, SOIC packages. 0V to 5V analog input voltage range with single 5V supply.  Table : Resolution versus Step Size for ADC (if Vcc = 5V)ĪDC0804 Features  Single channel ,8-bit parallel ADC module  Easy to interface with all Microprocessors or works Stand alone. Vcc Step Size  n 2 1  Vcc is the reference voltage of ADC with n-bit resolution.  Step size is the smallest change that can be recognized by ADC

 The higher-resolution ADC provides a smaller step size.  ADC has n-bit resolution, where n can be 8, 12, 16 or even 24 bits.  ADC are the most widely used devices for data acquisition.  4-BIT MAGNITUDE COMPARATOR  INTRODUCTION  VHDL CODE & SIMULATION RESULTĪDC  Analog-to-digital converter (ADC) is a device which can convert analogue voltage to digital numbers so that microcontrollers and microprocessors can handle and process the data. INTRODUCTION VHDL CODE & SIMULATION RESULT Presented by:- APARNA Department of Electronics Engineering (VLSI & ES)ĪDC FEATURES PIN DIAGRAM & DISCRIPTION ADC0804 INTERFACE SCHEMATIC & TIMING DIAGRAM VHDL CODE & SIMULATION RESULT VHDL CODE FOR ADC0804, 4-BIT MAGNITUDE COMPARATOR AND PARITY GENERATOR