AD7715ARU-3REEL7

Voltage - Supply, Digital:	3 V ~ 5.25 V
Features:	PGA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	16-TSSOP
Base Part Number:	AD7715
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Number of Bits:	16
Sampling Rate (Per Second):	500
Number of Inputs:	1
Input Type:	Differential
Data Interface:	SPI, DSP
Configuration:	PGA-ADC
Ratio - S/H:ADC:	--
Number of A/D Converters:	1
Architecture:	Sigma-Delta
Reference Type:	External
Voltage - Supply, Analog:	3 V ~ 3.6 V

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Data Acquisition - Analog to Digital Converters (ADC)

Analog to digital converter (ADC) is a device used for converting an analog signal into digital form, for further processing by a computer or microcontroller. One such ADC is the AD7715ARU-3REEL7, an integrated circuit (IC) designed to withstand operating temperature ranges up to 150°C. This part is ideal for converting signals from thermocouples, RTDs, and thermistors.

Overview of AD7715ARU-3REEL7

The AD7715ARU-3REEL7 utilizes the successive approximation register (SAR) architecture to achieve excellent accuracy and very low distortion performance for signal-to-noise ratio (SNR) and harmonic distortion (THD). The part integrates a 16-bit analog-to-digital converter and a programmable amplifier with gain from ±1 to ±125. The converter also contains a precision voltage reference and a low-noise track-and-hold circuit. Furthermore, the part also has SPI and I2C analog-to-digital converter data access interfaces. To improve power conservation, the converter supports a fast power-up time of 1ms and a standby current of 1μA.

Applications

The AD7715ARU-3REEL7 is suitable for seismic measurement, high-temperature signal acquisition, high-precision medical equipment, and automotive applications. Furthermore, its low-power consumption, high-speed sampling, and wide input dynamic range make it suitable for a variety of data-acquisition, process control, and industrial automation applications.

Working Principle

The working principle of a successive approximation register (SAR)-based ADC is based on the binary search technique. The first step is to apply a voltage reference to the input. Then, the SAR ADC sets the comparator’s positive input to the reference voltage, and the negative input to the input signal. The comparator output is then evaluated - if the input signal is larger than the reference voltage the output will be ‘1’ and if the input signal is smaller, the output will be ‘0’. This process is repeated for each bit of the ADC until the analog signal is fully converted into a digital output.The AD7715ARU-3REEL7 utilizes SAR ADC architecture to sample and convert signals in two’s complement format. It supports a variety of input ranges, ranging from ±1mV to ±500mV. Furthermore, the part features a 16-bit output resolution and can sample signals up to 2kHz. Additionally, it has a dual-step low-pass filter and a built-in reference to reject interference and improve accuracy and resolution.

Conclusion

The AD7715ARU-3REEL7 is a versatile analog-to-digital converter that is capable of operating in a wide range of temperature ranges. Its integrated components such as the precision voltage reference, SAR-based ADC, and programmable amplifier make it suitable for a variety of data-acquisition and industrial automation applications. Furthermore, it offers a low-power design and provides excellent accuracy, resolution, and signal-to-noise ratio performance.

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