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Data Acquisition - Analog to Digital Converters (ADC)

The LTC2238IUH#TRPBF Series is a low-power, high-speed, 12-bit, high-precision, quad-channel, simultaneous, +3.3V, CMOS analog-to-digital converter (ADC). This series has two inputs and four outputs, each input can be connected to four different analog input signals, plus the conversion of two external reference voltages (REF1, REF1B, REF2 and REF2B). The LTC2238IUH#TRPBF Series has an internal dual-channel sigma-delta modulator with a sampling rate range of Unibyte to 200kHz, which offers superior dynamic performance of 81dB SNR and 87dB SINAD at 10kHz bandwidth. Furthermore, the analog input range (+/-VREF) is set externally to 0V to VREF and has excellent linearity of +/-2LSB. The power requirements are low, using only 75mW of power.

Application fields

The LTC2238IUH#TRPBF is a powerful ADC that can be used in many application fields. This series can be used in a variety of process control and automation applications. It is suitable for data acquisition systems, where signals from process variables such as pressure, temperature, flow rate and level need to be converted to digital values for data processing/control purposes. In audio applications, the LTC2238IUH#TRPBF can be used for audio signal conversion and processing, such as audio equalization and compression. In industrial communication applications, the LTC2238IUH#TRPBF can be used for data acquisition and transmission, such as Ethernet communication and process control. In medical imaging systems, the LTC2238IUH#TRPBF can be used to convert analog signals to digital values which are then used by imaging systems to enhance image resolution and analysis.

Working principle

The LTC2238IUH#TRPBF is a high performance analog to digital converter. It uses a delta-sigma modulator to translate analog signals into digital values. The modulator performs the analog to digital conversion by multiplying input signals with the digital feedback signal. This feedback path reduces the quantization noise to a minimum, and the output of the modulator is filtered to reconstruct the original signal. The modulator is a combination of an adder and a multiplier, which is used to quantize the input signal. The input signal is added to the output of the modulator, and the resulting sum is multiplied by the feedback network. The output of the multiplier is then the quantized value of the analog signal. This process is repeated until the analogue signal is fully converted to a digital signal. Finally, the digital output of the LTC2238IUH#TRPBF is routed to an external processor for further data processing.

The LTC2238IUH#TRPBF is a powerful and versatile analogue to digital converter that can be used in many applications. Thanks to its high precision and high speed, it is widely used in various industrial, medical and audio applications. The low power consumption and fast response time also make it a great choice for high-demand applications. Its wide range of inputs and outputs make it suitable for a wide variety of situations and applications.

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