AD977CN

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AD977CN is a type of Analog to Digital Converters (ADC), it is a high performance 14-bit 2-channel successive approximation register (SAR) analog-to-digital converter. It has a low power and wide supply voltage range, which makes it suitable for low power and energy efficient applications. It also has small package size, which makes it suitable for portable or embedded applications.

The AD977CN application field covers a wide range of systems, from industrial and scientific measurement systems to automotive systems such as engine control. In addition, it can also be used in medical diagnosis systems, audio systems and consumer electronics.

Working Principle

AD977CN uses a successive approximation register, or SAR, to convert the analog input into a digital output value. This consists of a series of steps which are repeated until the desired result is achieved. The SAR conversion process is shown in the diagram below:

First, the input voltage that needs to be measured is compared with a reference voltage. The digital output is then set to 0x0000 and the MSB (most significant bit) of the result is set to 0. The SAR then moves on to the next bit and checks whether the input voltage is greater or less than the reference voltage. If the input voltage is lower than the reference voltage, the output value is set to 0. If the input voltage is higher than the reference voltage, the bit is set to 1. The same procedure is repeated for all the bits, until the final result is obtained.

For example, if the reference voltage is 2.5V and the input voltage is 2.75V, the output value will be 0x0001, indicating that the MSB was set to 1. The SAR will then move on to the next bit, and check if the input voltage is higher or lower than the reference voltage. In this case it is higher, so the next bit will be set to 1. The process is repeated for all the bits until the final result is obtained. The result for this example would be 0x0011, indicating that all the bits were set to 1.

Conclusion

The AD977CN is a high-performance 14-bit 2-channel analog-to-digital converter with a low power and wide supply voltage range, small package size and fast conversion rates. It is suitable for various applications such as industrial and scientific measurement systems, automotive systems, medical diagnosis systems, audio systems and consumer electronics. It uses the SAR technique to convert the analog input into a digital output value. This is done by comparing the input voltage with a reference voltage and setting the output bits accordingly.

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