It may be more complex than an A/D converter, but it offers better resolution. The biggest advantage of such a circuit is its high speed. As shown in the figure above, the CC signal is connected to the start conversion input in order to convert the cycle continuously. As the SAR determines each bit, digital data is also available serially. The CC signal in turn enables the latch, and digital data appear at the output of the latch. After Q0 is tried, the SAR makes the conversion complete (CC) signal HIGH to show that the parallel output lines contain valid data. This process goes on until all the bits are tried. Let’s explore the principle of operation of the A/D converter: The ATD CONVERTER converts analog voltage to binary numbers. If comparator output is HIGH, D/A output will be less than V in and the MSB will be set to the next position (Q7 to Q6) by the SAR.Īccording to the comparator output, the SAR will either keep or reset the Q6 bit. The role of the ANALOG-TO-DIGITAL CONVERTER (A/D) is to convert analog voltage values to digital values. If comparator output is LOW, D/A output will be greater than V in and the MSB will be cleared by the SAR. The output is given to the D/A converter which produces an analog equivalent of the MSB and is compared with the analog input V in. The MSB of the SAR (Q7) is set as soon as the first transition from LOW to HIGH is introduced. The 8-bit latch at the end of conversation holds onto the resultant digital data output.Īt the start of a conversion cycle, the SAR is reset by making the start signal (S) high. Till the digital output (8 bits) of the SAR is equivalent to the analog input V in, the SAR adjusts itself. If a 16-bit analog-to-digital converter is used, the lowest value will.
#8 BIT ANALOG TO DIGITAL CONVERTER SERIAL#
The output of the comparator is a serial data input to the SAR. So, if you are using an 8-bit analog-to-digital converter, the lowest value will be zero and the highest value will be 255. The analog output V a of the D/A converter is then compared to an analog signal V in by the comparator. The main part of the circuit is the 8-bit SAR, whose output is given to an 8-bit D/A converter. Successive Approximation Type Analog to Digital Converter
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