DC1525B-D

Series:	--
Part Status:	Active
Number of A/D Converters:	4
Number of Bits:	14
Sampling Rate (Per Second):	65M
Data Interface:	Serial LVDS
Input Range:	1 ~ 2 Vpp
Power (Typ) @ Conditions:	367mW @ 65MSPS
Utilized IC / Part:	LTC2172-14
Supplied Contents:	Board(s)
Base Part Number:	LTC2172

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Evaluation Boards - Analog to Digital Converters (ADCs): DC1525B-D Application Field and Working Principle

Analog to Digital Converters (ADCs) are an important component of an embedded system, performing the function of converting an analog signal into a digital signal. One such ADC suitable for embedded projects is DC1525B-D, which is an Evaluation Board (EVB) from Legeant. This EVB is designed to show the features of the 15-bit SAR ADC (Successive Approximation Register) IC, the LTC2217.

DC1525B-D Application Field

DC1525B-D has the ability to generate analog output signals with fast settling times and an excellent signal-to-noise ratio. As such, it has various application areas:

• Medical Imaging: The DC1525B-D can be used in medical imaging applications such as ultrasound imaging, where it can provide fast and reliable data conversion.
• Communications: The DC1525B-D can also be used in communication systems such as telecom, where it can provide fast and reliable data conversion.
• Automotive: The DC1525B-D can be used in automotive applications such as transmission, where it can provide fast and reliable data conversion.
• Industrial Control: The DC1525B-D can be used in industrial control systems, where it can provide fast and reliable data conversion.
• Instrumentation: The DC1525B-D can be used in instruments where its high speed and accuracy is beneficial.

DC1525B-D Working Principle

The DC1525B-D EVB consists of three main parts: the LTC2217 SAR ADC, an analog input signal source, and a digital-to-analog converter (DAC). It has the ability to generate and digitise bipolar signals that are between -4.095 V and 4.095 V. The LTC2217 operates by first performing an initial approximation of the signal voltage using the two-level scaling algorithm. This algorithm then divides the input voltage range into two equal parts. The reference voltage is then set and updated according to the estimated input voltage. The ADC then performs a binary search, calculating the midpoint between the reference voltages and updating the search with each iteration until the error is less than 1.The ADC then repeats the process until all of the binary signals are complete, and the digital data for the output signal is calculated. This process is referred to as the Successive Approximation Register because it approximates the voltage levels to determine the final digital output. The DAC adds an extra stage to the conversion, where it takes the digital output and converts it back to analog. This analog signal then controls the PGA, which in turn acts on the analog input signal.

Conclusion

The DC1525B-D EVB from Legeant is a great solution for various embedded applications where accurate and fast analog-to-digital conversion is needed. Its working principle involves the use of the LTC2217 SAR ADC, an analog input signal source, and a digital-to-analog converter, which together provide fast and reliable data conversion. The DC1525B-D is an ideal solution for medical imaging, telecom, automotive, industrial control, and instrumentation applications.

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