LTC1418IG#PBF

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Data Acquisition - Analog to Digital Converters (ADC) have been a major component of the electronic engineering and manufacturing industry for the past couple decades. The LTC1418IG#PBF is one of the latest ADCs from Linear Technology Corporation. It combines high accuracy, low power, and wide bandwidth and is ideal for applications requiring low-noise, high-precision analog signal acquisition. In this article, we\'ll discuss the features, application fields and working principle of the LTC1418IG#PBF.

Features of LTC1418IG#PBF

The LTC1418IG#PBF is an 8-bit, 20MHz, low-power analog-to-digital converter with both a serial (4-bit) and parallel (8-bit) output. It features a very high input accuracy of 0.25% max integrals over the operating temperature range of -40 to 120° C and excellent low-noise performance. It has two separate differential inputs, one for each of the 8 channels, and a single reference input. The input amplifiers are configured to provide high-input impedance and low-input current, as well as low-offset and high-common-mode rejection ratio, allowing for great signal integrity in noisy environments.

The LTC1418IG#PBF also has a ±5V operating voltage range, with an adjustable reference voltage of 1.5V to 4.6V. The power-saving low-power feature helps to reduce the device power consumption, while the fast conversion time of 20MHz makes the device versatile and suitable for many different applications.

Application Field of LTC1418IG#PBF

The LTC1418IG#PBF is ideal for use in portables and industrial applications due to its low-power feature and high accuracy. It is suitable in data acquisition, instrumentation, sensing and measurement applications requiring the highest performance. Its excellent common-mode rejection allows for use in wide-range noise environments such as automotive or medical equipment. The high input impedance of the input buffer amplifiers also makes it ideal for applications requiring greater precision and accuracy than is achievable using a traditional sample-and-hold converter.

The low five-volt power requirements along with the extended operating temperature range make the device suitable for a myriad of applications from industrial automation to lighting control systems. Furthermore, being a fully differential input converter, it is also well-suited to applications requiring buffered pseudo-differential signals such as those used in audio systems.

Working Principle of LTC1418IG#PBF

The LTC1418IG#PBF follows the traditional successive approximation register (SAR) conversion structure for its analog-to-digital conversions. It has two independent SAR ADCs, one for each of the 8 channels with separate reference inputs. The two SAR ADCs share an 8-bit shift register and sample-and-hold circuit. When the convert signal is set to high, the input analog signal is stored in the sample-and-hold circuit, and then the SAR ADCs start to convert the stored analog signal.

The ADCs receive the stored analog signal and then applies it to the input of the 8-bit shift register. Starting with the most significant bit (MSB), the ADCs apply a voltage level to the input of the shift register, and then compare the resulting ADC output to the stored analog signal. If the ADC output is below the stored analog signal level, the current bit of the shift register is set to a “1”, otherwise it is set to a “0”. This process is repeated until all 8 bits are processed. The output of the 8-bit shift register is then the 8-bit digital value that represents the analog input voltage.

The LTC1418IG#PBF also features an Auto-Calibration feature. This feature automatically adjusts the reference voltage of the converter to accurately match the input signal level and guarantee a consistent conversion result. The Auto-Calibration function can be used for all 8 channels or for a single channel, depending on the application requirements.

Conclusion

In conclusion, the LTC1418IG#PBF is an excellent analog-to-digital converter with a range of features that make it an ideal choice for a wide range of applications. Its 8-bit, 20MHz, low-power design, along with its high accuracy, low-power and wide bandwidth, make it an ideal choice for applications requiring low-noise, high-precision analog signal acquisition. Additionally, its Auto-Calibration feature ensures a consistent conversion result.

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