0804 adc pdf

Ordering Information. Typical Application Schematic. CLK IN 4. INTR 5. AGND 8. DGND CLK R File Number Three-State Disabled Output. Output Short Circuit Current,. I SINK. The separate AGND point should always be wired to the. DGND, being careful to avoid ground loops. Two on-chip diodes are tied to each analog input see Block Diagram which.

Be careful,. As long as the analog V IN does not exceed the supply voltage by more than. To achieve an absolute 0V to 5V input voltage range will therefore require a minimum supply volt-. With an asynchronous start pulse, up to 8 clock periods may be required before the internal clock phases are proper to start the conversion.

An arbitrarily wide pulse. Timing Diagrams. However, if an all zero code is desired for an analog input other than 0V, or if a narrow full scale span. Timing Waveforms. C L 10K. V REF The full scale adjustment can be made by applying a. Reference Accuracy Requirements. The converter can be operated in a pseudo-ratiometric mode. By adjusting the size of the adjustable resistor, a voltage between V can be obtained.

The task of ADC is to convert the analog voltage into an 8-bit digital quantity, the range is 0xxFF. The reference voltage is 2. Figure 2 ADC start conversion timing diagram. According to the ADC start conversion timing diagram Figure 2 , it can be seen that the ADC starts the conversion through the following series of processes: first, clear CS, that is, change CS to low level, after a slight delay, change WR from high level to low level, and then change WR to high level after a slight delay, and the AD conversion is officially started.

After AD conversion time periods, the analog-to-digital conversion is completed, and the conversion result is automatically stored in the internal latch. Figure 3 ADC read data timing diagram. At this time, the microcontroller can read the data on the digital signal output terminal, and then pull RD to a high level.

This article writes a complete ADC analog-to-digital conversion test program, as shown below, and gives the program function comments line by line. The program is written strictly in accordance with the ADC start-up conversion timing and read data timing.

Its function is to obtain different voltages by adjusting the adjustable resistor R2 in Figure 1. This voltage is used as the analog input of ADC, which is converted to 8-bit digital quantity by ADC, and drives 8-bit light-emitting diodes respectively. Different voltages are converted into different digital quantities, so that the brightness of the 8-bit LED is different.

Observing this phenomenon indicates that the design of the analog-to-digital conversion circuit in this article is correct. In this paper, single-chip microcomputer is used as the controller, the ADCbased analog-to-digital conversion circuit is designed, the working principle of ADC is discussed, and a complete test program is given and annotated. Through testing, the circuit can work normally, laying a good foundation for further research in the field of circuit design in the future.

It is a pin Single channel 8-bit ADC module. ADC stands for Analog to Digital Converter, which converts the analog signal into the digital signal. The values can represent the ranges from 0 to i. Irene 16 Sep Continue reading ». Mia 21 Dec The mosfet has a low gate threshold voltage of 4V and hence commonly used with microcontrollers Irene 14 Sep Iggy 1 Sep The NE timer IC is an integrated circuit chip used in a variety of timer, delay, pulse generation, and oscillator applications.

Or even to use as a standalone ADC module. Hence, if you are looking for a compact ADC module with a decent resolution of 8-bit then this IC is for you. Since the IC comes with an internal clock we do not need many components to make it work. However to make the internal clock to work we have to use a RC circuit. The chip select CS and Read R pin should also be grounded. Only if this is done the ADC value on the output side will be update.