ADS58B18IRGZR

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Analog to Digital Converters, commonly referred to as ADCs, are chip-based devices used to convert analog signals into digital representations of the same. Although there are many types of ADCs, the application field and working principle of the popular ADS58B1 8IRGZR chip is worth exploring in greater detail.

The Application Field of ADS58B18IRGZR

As far as applications are concerned, the ADS58B18IRGZR is a medium-speed, low-power, 18-bit ADC that enables reliable, high-accuracy Sampling of analog signals typically used in embedded industrial and telecoms applications. The device operates best within a temperature range of -40 to +125 Celsius and can support sampling of input frequencies up to 1.2GHz and provides a wide range of pin-compatible sampling resolutions (6, 8, 10,12,16 and 18-bit accurate results). Its high-performance characteristics make it ideal for a variety of applications including medical imaging, motion control and communications, High-performance Video Acquisition, ADC Frontending, and SCADA systems, among others.

ADS58B18IRGZR Working Principle

In terms of its working principle, the ADS58B18IRGZR is a successive-approximation-register (SAR) type ADC, meaning it works by converting analog voltages into digital numbers by means of making repeated approximations and storing the result. The device first samples the input signal and stores it in the internal Sample and Hold circuit, before the sample is then fed into the Successive Approximation Register (SAR) block, where the successive-approximation algorithm is executed. Once the sample has been converted, the result is then stored in the ADC’s register.

The SAR block works by comparing the input sample’s voltage against a reference voltage, which in this instance, is programmable. The SAR block also comprises of a counter that counts in binary, so starting at zero and counting up first to one and then to two and on and on, until it reaches a value that accurately represents the input voltage. This count is then stored in the device’s result register, from whence it is then sent to the output in the form of a binary number. This count corresponds to the analog input’s voltage and is represented in the device’s specific output format.

The Example of ADS58B18IRGZR

To better understand the working principle of the ADS58B18IRGZR, let’s consider a hypothetical example where an analog signal of 1.2V is applied to the device and needs to be converted to its digital representation. In this instance the in-built reference voltage is set to 1.024V and the SAR counter starts counting from 0 to 9 until it reaches a count where the reference voltage is greater than the input signal’s voltage. In this example, the counter reaches a count of 7 (1.144V), which is then stored in the device’s register and sent to the output as 00000111b (binary) or 7 (decimal). This count corresponds to the input voltage of 1.2V and is presented in the device’s output format, i.e. a binary number.

Conclusion

In conclusion, the ADS58B18IRGZR is an eighteen-bit, medium-speed, low-power ADC chip used to convert analog signals into digital representations for a variety of embedded industrial and telecoms applications. The device works by making successive-approximations and store the result in an internal register before presenting the output in binary form. This chip’s characteristics make it perfectly suitable for applications such as medical imaging, motion control and communications, High-performance Video Acquisition, ADC Frontending, and SCADA systems, among other applications.

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