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AN1636 Datasheet(PDF) 4 Page - STMicroelectronics |
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AN1636 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 42 page  4/42 UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS 1 WHAT IS AN ADC? An analog to digital converter is a peripheral which converts analog signals in a defined range to the digital outputs. In the real world, signals are mostly available in analog form. To use a microcontroller in this type of system, an ADC is required, so that the signals can be converted to the digital values. The application software can then process the digital outputs and take decisions depending on the application or system requirements. The limitation imposed by the finite number of digital outputs decides how close the output is to the analog input. The more bits there are in the output, the closer the digital result will be to the analog signal. In other words, the resolution of the ADC is defined by the number of bits in the digital result (8 bits, 10 bits etc) and the input voltage range. Successive Approximation Method Different techniques are available for converting analog signals to digital outputs. The Succes- sive approximation method is the most popular technique. It is also known as Successive ap- proximation Register (SAR) technique. This technique uses binary search method. It consists of a high speed comparator, DAC (digital to analog converter), and control logic. Refer to Figure 1. Figure 1. Successive Approximation Block Diagram The SAR starts by forcing the MSB (Most Significant bit) high (for example in an 8 bit ADC it becomes 1000 0000), the DAC converts it to VAREF/2. The analog comparator compares the input voltage with VAREF/2. If the input voltage is greater than the voltage corresponding to the MSB, the bit is left set, otherwise it is reset. Control Logic + - Comparator DAC From Sample and Hold VAREF n bit register VIN Digital Output |
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Similar Description - AN1636 |
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