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Data Acquisition - Analog to Digital Converters (ADC)

The LTC2188/LTC2188CUP is a dual-channel, deep dynamic range 20-bit analog-to-digital converter. LTC2188CUP has monolithic CMOS construction, requiring a single +5V supply for operation. This ADC is designed for wide application fields, including audio, telecommunication, instrumentation and data acquisition systems. High speed operation is achieved by both the 10MSPS (LTC2188CUP-10) and the 20 MSPS (LTC2188CUP-20) models.

Applications

The LTC2188CUP is designed for general purpose applications in the measurement, control, and monitoring fields. Its features makes it best suitable for audio, telecommunications, instrumentation and data acquisition systems. Owing to its low power and lower noise characteristics, it can be used for battery based data acquisition systems. Its modular design enables it to be easily integrated into other integrated systems.

Working Principle

The LTC2188CUP works on the principle of low offset CMOS differential amplifier with low voltage feedback structure. It is an analog to digital converter IC, consisting of two channels, each having one input and an output for each channel. The input of one channel is connected to the output of the other and the output of one channel is connected to the input of the other. The input current is converted through the differential amplifier into a low voltage signal, or a current difference. This is then processed through the CMOS differential amplifier and then converted into a digital output. The current difference is determined as a result of the incoming input current into the IC. The output of the ADC can be set to different levels to output a corresponding digital value.

Features

• 20-Bit Resolution
• 1.8V Reference Inputs
• Integrated Charge Pump, DAC
• Serial/Parallel Outputs
• Low DC Offset, Low Drift
• High RON Matching 0.25LSB
• Low Noise and Low Power Consumption
• Differential Inputs with Low Common Mode Inputs
• Wide Input Voltage Range of 4V to 3.6V.

Conclusion

The LTC2188CUP is a dual-channel, deep dynamic range 20-bit analog-to-digital converter designed for a wide range of applications. Its features make it well suited for audio, telecommunications, instrumentation and data acquisition systems. Through its high accuracy and fast speed support, this ADC provides a high performance solution for analog-to-digital conversion.

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