Usually, 0 is a start bit, and 1 is the stop bit. In asynchronous transmission, an extra bit is added to each byte so that the receiver is alert about the arrival of new data. Serial Transmission has two subclasses synchronous and asynchronous. It consists of a D-shaped 9 pin cable that connects the data in series. However, the data transferred in the serial transmission is in proper order. 0 and 1 respectively.įor transmitting data to a longer distance, serial data cables are used. Eight bits are transferred at a time having a start and stop bit (usually known as a Parity bit), i.e. Serial ADCs are discussed at the end of this section.In Serial Transmission, data is sent bit by bit from one computer to another in bi-direction where each bit has its clock pulse rate. In parallel ADC, we have 8 or more pins dedicated to bringing out the binary data, but in serial ADC we have only one pin for data out. The ADC chips are either parallel or serial. Conversion time is defined as the time it takes the ADC to convert the analog input to a digital (binary) number. In addition to resolution, conversion time is another major factor in judging an ADC. In this chapter we examine several 8-bit ADC chips. The higher-resolution ADC provides a smaller step size, where step size is the smallest change that can be discerned by an ADC. An ADC has n-bit resolution where n can be 8, 10, 12, 16 or even 24 bits. Therefore, we need an analog-to-digital converter to translate the analog signals to digital numbers so that the microcontroller can read and process them. Sensors for temperature, velocity, pressure, light, and many other natural quantities produce an output that is voltage (or current). Transducers are also referred to as sensors. A physical quantity is converted to electrical (voltage, current) signals using a device called a transducer.

Temperature, pressure (wind or liquid), humidity, and velocity are a few examples of physical quantities that we deal with every day. Digital computers use binary (discrete) values, but in the physical world everything is analog (continuous). Analog-to-digital converters are among the most widely used devices for data acquisition.

Parallel to serial converter what is it