How do I choose an ADC?

How do I choose an ADC?

ADC Selection Criteria to Consider

1. Resolution refers to the number of output bits that the ADC can generate per conversion.
2. Speed has to do with the device’s sampling rate – in other words, what is the highest number of conversions per second that the ADC can handle?
3. Accuracy is relatively straightforward.

Which type of ADC is best?

Sigma–Delta ADCs–for Higher Accuracy from More Bits When you want the accuracy from more sampling bits or really need the highest effective number of bits (ENOB), sigma-delta ADCs are usually the best choice, especially for low-noise precision applications.

Which is the most commonly used ADC?

The most common types of ADCs are flash, successive approximation, and sigma-delta. The flash ADC is the fastest type available. A flash ADC uses comparators, one per voltage step, and a string of resistors. A 4-bit ADC will have 16 comparators, an 8-bit ADC will have 256 comparators.

Which type of ADC is slow?

Sigma Delta ADC Serial Output is proportional to analog input voltage. Advantages: It has high resolution. It does not require any external components. Disadvantages: It is slow in conversion due to oversampling.

Which ADC has more expensive to build?

Successive Approximation ADC: This converter compares the input signal with the output of an internal DAC at each successive step. It is the most expensive type. Dual Slope ADC: It have high accuracy but very slow in operation. Pipeline ADC: It is same as that of two step Flash ADC.

Why are ADC so expensive?

The Wikipedia article on ADCs explains how these chips get so expensive: Direct conversion is very fast, capable of gigahertz sampling rates, but usually has only 8 bits of resolution or fewer, since the number of comparators needed, 2N−1, doubles with each additional bit, requiring a large, expensive circuit.

How big of an ADC do I Need?

The amplifier is connected to a 12-bit ADC with a ±10 volt full-scale bipolar range. The data logger will not respond to changes in pressure of less than 4.88 psi.

Which is ADC architecture is right for your application?

The acronym, SAR, which actually stands for successive-approximation register —the logic block that controls the conversion process—is universally understood as an abbreviated name for the entire architecture. The timing diagram for a typical SAR ADC is shown in Figure 3.

Why do I need a higher resolution ADC?

Depending upon what you’re trying to do the higher resolution may be overkill, like measuring the length of your driveway. But it may come in handy for sizing up the miter joints of the dining room cabinet you’re building.

Do you need high ADC resolution for miter joints?

But it may come in handy for sizing up the miter joints of the dining room cabinet you’re building. Likewise, high ADC resolution is sometimes handy and sometimes overkill, but it’s more difficult to quantify where the breakpoints are. You have to start with basic information: