LTC2421CMS#PBF

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Data Acquisition - Analog to Digital Converters (ADC): LTC2421CMS#PBF application field and working principle

The LTC2421CMS#PBF is an Analog to Digital Converter (ADC) with product package 24-TQFN. It is a low power, high performance device designed to convert an input voltage into a digital output code. It was designed for applications that require fast conversion to provide accurate digital representation of analog signals with resolution up to 24 bits. The internal reference voltage can be varied to provide flexibility for different input ranges.

Application Fields

The LTC2421CMS#PBF ADC is widely used in many application fields, such as automotive and industrial measurements, power monitoring, metrology measurement, radiation detection, digital audio, and many other fixed SOT-23 ADC applications. It is also suitable for digital control loops and sensor measurement, camera modules, and most any ADC-based data acquisition system. Certain features become very useful in these applications, such as, very low power consumption and a low output data rate.

Key Features & Specifications

• 16/24-bit resolution, excellent linearity and low power consumption
• Dynamic range of 65 dB
• Fast conversion rate of up to 30 ksps
• Differential and single-ended input
• Input frequency up to 100 kHz
• No missing codes over the full input voltage range
• Programmable internal reference from 10 mV to 7.5 V
• External reference inputs up to 15 V
• 4-input multiplexer and inter-channel calibration
• Power consumption of 10 µA
• Package size of 24-TQFN (3 mm × 3 mm)

Working Principle

The LTC2421CMS#PBF ADC uses a successive approximation register (SAR) architecture. This type of ADC works by comparing the input voltage to a reference voltage, one bit at a time. Each time the comparator makes a comparison with a higher reference voltage, the corresponding bit is set. This process continues until the input is completely compared. After all the bits are compared and set, the binary code can be sent out to the output.

The LTC2421CMS#PBF ADC is also equipped with an on-chip temperature sensor. This built-in temperature sensor works by measuring the voltage drop across a reference resistor, which is adjusted according to the temperature. The temperature sensor is capable of providing very accurate temperature data, within ±0.1 oC accuracy.

In addition, the LTC2421CMS#PBF ADC is designed to provide very low noise performance. It features a low-noise programmable gain amplifier (PGA) which can reduce the input noise by up to 65 dB. The PGA also provides a wide input range, allowing the user to select the best gain setting for their application.

Conclusion

The LTC2421CMS#PBF ADC is a high performance device with 24-bit resolution and excellent linearity. It has a wide range of applications and it is suitable for a variety of data acquisition systems. It can be used in automotive, industrial and metrology measurement systems as well as digital control loops and sensor measurement systems. Moreover, its low power consumption, fast conversion rate and low output data rate makes it an ideal choice for these applications.

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