AD7703AN

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Number of Bits:	20
Sampling Rate (Per Second):	4k
Number of Inputs:	1
Input Type:	Single Ended
Data Interface:	SPI
Configuration:	S/H-ADC
Ratio - S/H:ADC:	1:1
Number of A/D Converters:	1
Architecture:	Sigma-Delta
Reference Type:	External
Voltage - Supply, Analog:	5V
Voltage - Supply, Digital:	5V
Features:	--
Operating Temperature:	-40°C ~ 85°C
Package / Case:	20-DIP (0.300", 7.62mm)
Supplier Device Package:	20-PDIP
Base Part Number:	AD7703

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AD7703AN is an analog-to-digital converter (ADC) from Analog Devices that consists of a successive approximation-register (SAR) featuring an 8-bit resolution with a maximum sampling rate of 40 kilohertz (kHz). Specifically, its 8-bit resolution gives it the ability to convert analog signals into 256 output levels, with a total power supply range of 2.7 to 5.5 volts (V). Moreover, the device also features a low power consumption, making it an efficient and viable choice for those in need of an ADC for their data acquisition applications.The ADC was designed to improve accuracy and thermal performance, with a low integral non-linearity of ±1/2 least significant bit (LSB), and a low-power operation with minimal glitch energy. As a result, it is an ideal choice for applications such as medical electronics, portable device integration, and remote sensing, amongst others. The following sections of this article will focus on AD7703AN’s applications and working principle.Applications:The versatile AD7703AN 8-bit ADC has been used in a range of data acquisition applications. It is capable of sampling very low voltage signals with its 2.7 V to 5.5 V power supply range. As such, it is suitable for acquisition systems such as electrocardiogram (ECG) monitors, thermometers, and digital thermometers. Additionally, the low total harmonic distortion (THD) of 0.2 percent ensures low-noise applications such as acoustic instrument digitalization can be implemented. As an example, it can be used in digital pianos to accurately map the acoustic signals picked up by microphones onto digital signals.Moreover, the low power usage of the converter makes it well-suited for battery-powered, portable, and remote systems. The built-in, low-power sleep mode makes the device ideal for such applications, as it can be put into sleep mode for extended periods of time and still maintain a low power consumption. Other low-power solutions, such as using a Hall-effect sensor for sensing weather conditions, are also possible. To sum up, the AD7703AN 8-bit ADC is an extremely versatile device when it comes to data acquisition applications.Working Principle:The working principle of the AD7703AN 8-bit ADC is based on a successive approximation-register (SAR) employed to digitally convert analog inputs into 8-bit words (representing the range 0 to 255). The analog input is sampled, and then the output is compared with the desired level until the two match. The input can be single-ended or differential, with input voltages from 0.5V to Vref (reference voltage), typically 2.5V, and a maximum input offset voltage of 20 mV. The converter is highly efficient in terms of power consumption, as it is capable of using the built-in low-power sleep mode with minimal power draw.Once the analog signal is converted to a digital word, the output is updated every 0.25 milliseconds (ms) and is then processed in order to determine the PWM or DAC output. In order to further enhance the accuracy of the converter, the AD7703AN can be used with an external temperature-compensated reference such as the ADR2045.In conclusion, the AD7703AN 8-bit ADC by Analog Devices is a useful and highly capable converter that is suitable for a variety of data acquisition applications. Its low power consumption and high accuracy characteristics make it an all-purpose solution for ADC needs, and its 8-bit resolution ensures accurate mapping of analog signals into 256 output levels. The device’s working principle is also well-suited for any task, as it relies on a successive approximation-register (SAR) for data conversion, and voltage offsets can be minimized by the addition of an external reference.

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