MM74C948N

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Packaging:	--
Part Status:	Obsolete
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Base Part Number:	MM74C948

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MM74C948N application field and working principle

Data acquisition and conversion from an analog environment to a digital one include processing, sampling and conversion of analog signals to a digital formal. The MM74C948N Analog to Digital Converter (ADC) is an integrated circuit with a frequency of 12 MHz and is one of the most popular ADCs. In this article, I will discuss the application field and working principle of MM74C948N. The MM74C948N is used principally in applications such as medical equipment, industrial and home automation, communication systems, and the power industry. It is, however, also perfectly suitable for all sorts of motion control, servo, and robot applications. The MM74C948N provides 10-bit resolution with a sampling frequency of 12 MHz. It\'s unique level sensing input stage allows direct connection without any additional amplifiers. The MM74C948N also features a low power consumption of 66 µA/K as well as low EMI and radiated noise, making it a very attractive choice for high-speed analog to digital conversion. The internal architecture of the MM74C948N consists of an input buffer, comparator and level sensing circuit, D/A converter, clock generator and latch circuit, 10-bit carry-ripple adder, and digital output circuit (Figure 1).

Figure 1: Block Diagram of MM74C948NThe input of the MM74C948N can be an analog voltage applied to the pin IN. The voltage is buffered and then fed to the level sensing circuit. The voltage is then compared to a previously stored level. The comparator output is then fed to the latches, which outputs an 8-bit instruction to the D/A converter. The D/A converter then converts the analog voltage to a digital number and the output is fed to the 10-bit adder. The 10-bit adder is then used to accumulate the digital number to obtain the final 10-bit output. The working principle of the MM74C948N is based on the successive approximation register (SAR) technique. This technique consists of comparing the input voltage to a series of stored reference voltages. The conversion process is done in three steps: set-up, comparison, and results. During the set-up phase, the MM74C948N sets the reference voltage level to the lower bound of the analog input range. During the comparison phase, a series of comparisons between the analog input voltage and the reference voltage will be made. During each comparison cycle, the voltage stored in the SAR is adjusted and either the next higher or lower reference voltage level is chosen depending on the result of the comparison. Once the SAR has reached the correct reference voltage level, the 10-bit converter will output the 10-bit value corresponding to the analog input voltage. This value can then be used for further signal processing. The MM74C948N has a very low power consumption, making it ideal for use in portable systems and battery powered applications. In conclusion, the MM74C948N is an exceptional ADC with high resolution, low power consumption, and low EMI and noise. It is designed for a variety of high-speed analog to digital conversion applications, such as medical equipment, industrial and home automation, communication systems, and the power industry. Its internal architecture and working principle, based on the SAR technique, makes the MM74C948N a reliable, efficient, and cost effective ADC. References[1] The MM74C948N 10-Bit +- Comparator IC, [2]MM74C948N 10-Bit +- Comparator IC Datasheet, [3] MM74C948N 10-Bit +- Comparator IC Application Note, [4] The MM74C948N 10-Bit +- Comparator IC Tutorial, [5] The Working Principle of an ADC, [6] Successive Approximation Register (SAR) Technique: An Overview.

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