LTC2267CUJ-12#PBF

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Data Acquisition - Analog to Digital Converters (ADC) encompasses a broad range of components used for the conversion of analog signals, such as electrical voltages, into digital form. One such component is the Linear Technologie LTC2267CUJ-12#PBF, an Ultra-Low-Power, Dual, 12-Bit SAR Analog-to-Digital Converter with Internal Reference and Track/Hold. Described in the following paragraphs is the application field and working principle of this ADC.

Application Field of the LTC2267CUJ-12#PBF

The LTC2267CUJ-12#PBF is specialized for applications requiring low power consumption and high accuracy. This small, dual-channel ADC offers outstanding performance for battery-powered, system-monitoring applications, ranging from industrial to consumer. Its wide input voltage range (-V_SS to +V_DD) and low-voltage operation (as low as +1.7V) make it ideal for monitoring low-voltage signals in space-constrained systems.

Thanks to its 12-bit no harmonic distortion (THD) and 1LSB INL (Integral Non-Linearity), the LTC2267CUJ-12#PBF is suitable for audio and medical applications, such as voice recognition, medical imaging, and neural networks. Additionally, its ultra-low power consumption makes it a great choice for power-sensitive applications, including IoT (Internet of Things) devices, connected smart home appliances, wearable electronics, and mobile communications.

Working Principle of LTC2267CUJ-12#PBF

The LTC2267CUJ-12#PBF is a SAR (Successive Approximation Register) type ADC. It implements a comparator with digital to analog converters (DAC) and a successive approximation register (SAR), which together convert analog signals into digital form. The SAR is essentially a modifiable resistor ladder integrated into the ADC.

The system works by comparing the analog input to a reference voltage, which is derived from a bandgap voltage reference circuit and applied to the DAC. The DAC produces a digital output code that is continually modified by the SAR loop until the analog input is between two ladder values and the signaling circuit cycles are complete. The SAR logic works in binary fashion and is advanced one bit at a time. This process continues until the desired code is produced and all bits are within their allowable accuracy. The output code of the ADC is then akin to a binary number, which is the digital representation of an analog signal.

Conclusion

The Linear Technologie LTC2267CUJ-12#PBF is a specialized dual-channel Ultra-Low-Power ADC with internal reference and track/hold. Its wide input voltage range and low-voltage operation, 12-bit THD and 1LSB INL, and ultra-low-power consumption make it a great choice for applications ranging from industrial to consumer, such as IoT devices, smart home appliances, wearable electronics, and audio and medical applications. It works following the Successive Approximation Register (SAR) principle, where the analog input is continually compared to a reference voltage derived from a bandgap voltage reference circuit and converted into binary code, representing a digital representation of the analog signal.

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