LTC2242IUP-12

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The LTC2242IUP-12 is an ADC that belongs to the Data Acquisition - Analog to Digital Converters (ADC) category. The device is part of a larger family of ADCs, as it is part of Linear Technology’s LTC224x family. It is a 12-bit, low power and low noise pipelined SAR-based A/D converter. It is a one-channel converter, and boasts DC accuracy of ±1.5LSB INL, ±2.5LSB DNL and 15-bit ENOB (effective number of bits). The LTC2242IUP-12 has a 150μA max quiescent current and supports a wide range of supply voltages from 2.4V to 5.25V.

This converter is well-suited for use in a variety of applications from thermoelectric digital interface to audio measurement systems. With a low power operation, it is ideal for portable instrumentation, medical and industrial equipment, as well as many consumer electronics, where accuracy and power efficiency are a priority.

The LTC2242IUP-12 also has excellent performance in terms of sampling rate and ensured dynamic accuracy. With a sampling rate of 50SPS (samples per second), the ADC ensures no sample-to-sample errors over the entire voltage range. Additionally, its dynamic performance is ensured by a 61dB total harmonic distortion (THD) + noise and 91dB signal-to-noise-and-distortion ratio (SNDR) at the full scale.

The device ships with integrated features such as an overrange indicator, channel-selectable gain, up to 2 MSPS data throughput, and three configurable power-down modes. All these features are set using SPI communication, as the device must be connected to a microcontroller to communicate. The device also uses reference crystalline oscillator for internal reference. The device also has a parallel output pin.

The LTC2242IUP-12 works by first converting an analog input to digital data in a two-step process. When an analog input is applied, the ADC first converts it to an 8-bit approximation in the conversion step. This digital value is then stored and the reference voltage is adjusted accordingly. The following step is the refinement step, where the 8-bit digital data from first step is compared to the adjusted reference voltage and the output is updated with a 12-bit digital data.

Overall, the LTC2242IUP-12 is a 12-bit, low power and low noise pipelined SAR-based A/D converter offering excellent performance. With a sampling rate of 50SPS, the ADC ensures no sample-to-sample errors over the entire voltage range. Additionally, its dynamic performance is ensured by an impressive 61dB total harmonic distortion (THD) + noise and 91dB signal-to-noise-and-distortion ratio (SNDR) at the full scale. Furthermore, the device ships with integrated features such as an overrange indicator, channel-selectable gain, up to 2MSPS data throughput, and three configurable power-down modes. As such, the LTC2242IUP-12 is well-suited for use in a variety of applications from thermoelectric digital interface to audio measurement systems, and is ideal for portable instrumentation, medical and industrial equipment, as well as many consumer electronics, where accuracy and power efficiency are a priority.

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