AD7657BSTZ

Number of A/D Converters:	6
Base Part Number:	AD7657
Supplier Device Package:	64-LQFP (10x10)
Package / Case:	64-LQFP
Operating Temperature:	-40°C ~ 85°C
Features:	Simultaneous Sampling, True Bipolar
Voltage - Supply, Digital:	5V
Voltage - Supply, Analog:	5V
Reference Type:	External, Internal
Architecture:	SAR
Series:	iCMOS®
Ratio - S/H:ADC:	1:1
Configuration:	S/H-ADC
Data Interface:	SPI, Parallel, DSP
Input Type:	Single Ended
Number of Inputs:	6
Sampling Rate (Per Second):	250k
Number of Bits:	14
Part Status:	Active
Packaging:	Tray

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IntroductionData Acquisition (DAQ) is the process of extracting meaning from measured signals. By converting analog signals into digital signals and then onto a computer, information can be recorded, analyzed and displayed. Analog to Digital Converters (ADC) have been playing an important role in data acquisition for quite some time. The AD7657BSTZ ADC is a representative in this field. This article will examine the application field and working principle of the AD7657BSTZ.Application FieldThe AD7657BSTZ ADC is ideal for a wide range of applications, including medical, industrial and consumer data acquisition. It is designed to provide a low power, low cost, high performance solution for data conversion in high frequency, high accuracy and real-time environments. It is particularly well suited for applications with multiplexed analog inputs and where speed or resolution requirements exceed those of traditional ADCs.The AD7657BSTZ is designed to improve system performance, provide near theoretical noise immunity and offer flexibility in synchronization. It is well suited for high resolution and high performance applications, such as instrumentation and medical applications. It is also ideal for data acquisition applications that require high speed, low noise, and low cost. In addition, it features a configurable low-drift Autozero architecture for high-performance accuracy and stability in a temperature drifting environment.Working PrincipleThe AD7657BSTZ ADC operates on a three-step process for converting an analog input signal into a digital output signal.Step 1: InitializeThe first step in the conversion process is the Initialize. During this step, the analog input signal is converted into its digital equivalent using a multi-bit digital-to-analog converter (DAC). The analog voltage is fed into the DAC, which is then converted into a 16-bit digital value. The digital output is then fed into a look-up table (LUT), which is used to store and map the input signal values to digital output values.Step 2: SampleThe second step is Sampling. Once initialized, the ADC takes continuous samples of the analog signal at a specified rate. When a sample is taken, the digital input signal is fed into a sample-input register. The signal is then converted using the LUT and stored in a data register.Step 3: OutputThe third and final step is Output. During this step, the signal is simply transferred from the data register to the ADC\'s digital output register. The signal is then sent out of the ADC in the form of a digital output signal.ConclusionThe AD7657BSTZ ADC is a low power, low cost, high performance solution for data conversion in high- frequency, high-accuracy, and real-time environments. It is designed to improve system performance, provide near theoretical noise immunity, and offer flexibility in synchronization. In a three-step process, the ADC takes an analog input signal, converts it into its digital output, and then sends it out of the ADC. The AD7657BSTZ ADC is ideally suited for applications with multiplexed analog inputs and for data acquisition applications that require high speed, low noise, and low cost.

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