LTC2378IDE-20#PBF

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Data acquisition technology is the gathering of data from physical parameters through sensing, conversion, capture and storage of a signal for future use. Analog to Digital Converters (ADCs) are important components of data acquisition systems which are used to convert Analog Signals into a form suitable for digital processing. The LTC2378IDE-20#PBF from Analog Devices is an 8-channel 8-bit micro-power successive approximation register type ADC ideal for battery powered applications. It offers an integrated power management solution with nanosecond settling time, low supply current and comprehensive pipeline architecture. In this article, we review the application field and working principle of the LTC2378IDE-20#PBF.

Application Field

The LTC2378IDE-20#PBF is a monolithic 8-channel 8-bit ADC and provides simultaneous sampling of differential or single-ended input signals. Its purpose is to enable high-accuracy analog data measurement and capture. Its features include:

• High Accuracy: ±1 LSB INL, 0.1% FSR
• Low Power: Up to 65µA supply current
• Small Footprint: 4.0x4.0mm, 0.4mm pitch MSOP-16 package
• High-Speed Settling Time: 2.1µs for a 2pC step
• Wide Input Range: -0.3V to +3V common mode voltage range, 0V to +2.8V differentials signal
• High Sampling Speed: 150kS/s max

Due to its low power requirements and integrated power management solution, the LTC2378IDE-20#PBF is particularly suitable for battery-powered applications, ranging from industrial to medical and instrumentation. It can be used in many different data acquisition applications such as automotive and military systems, data logging and machine control, environmental testing and monitoring, and so on.

Working Principle

The LTC2378IDE-20#PBF is an 8-channel 8-bit SAR ADC, which converts analog inputs into 8-bit digital codes with the help of a successive approximation register (SAR) architecture. It performs two stages of A/D conversion: the sample/hold stage to capture the analog input voltage and hold it for a finite period of time, and the conversion stage to convert the captured voltage into a digital code. The sample/hold stage is based on a sample-and-hold capacitor that retains the voltage level on the conversion clock (cCONV), while the gain and offset errors of the device are reduced through a pipeline architecture.

After the sampling stage, the A/D conversion commences. An 8-bit SAR circuit is used to convert the analog input voltage into an 8-bit digital output. The SAR algorithm uses the stored reference voltage to compare the analog input voltage with a series of bits. Starting with the most significant bit (MSB) of the digital output, the SAR firstly compares the stored reference voltage with the analog input voltage. If the analog input voltage is greater than the reference voltage, the MSB of the output is set to 1. This process is repeated for the remaining bits until the least significant bit (LSB) is set.

The LTC2378IDE-20#PBF also features an integrated power management solution that supports different power modes. The device can be put into an active, idle, or power-down mode depending on the application’s requirements. During active mode, the device is clocked at the nominal device speed and the power consumption is at its highest. By setting the idle mode, the device can be put into standby, with the internal clock disabled and the temperature sensors enabled. In power-down mode, the maximum current consumption is reduced to a minimum.

To sum up, the LTC2378IDE-20#PBF 8-channel 8-bit micro-power successive approximation register type ADC from Analog Devices is an ideal choice for high-accuracy data acquisition applications in battery-powered applications. Its integrated power management solution, low current consumption and wide input range make it an attractive choice for industrial, medical and instrumentation systems.

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