AD7703BR

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Analog to Digital Converters (ADCs) is a type of data acquisition device that converts analog signals into digital data. AD7703BR is a precision, low-power, single-channel sigma-delta analog-to-digital converter (ADC). It has a high resolution of 12-bits over a full scales range (FSR) from 0 to 3.3 V. It also features an on-chip reference and includes a low-pass filter prior to the sigma-delta modulator.

The most obvious application field of the AD7703BR is in consumer electronic systems, such as digital cameras and audio recording equipment, as it can convert analog signals into digital form for digital storage or processing. Additionally, it can also be used for medical instruments, home security, temperature and process control systems, data loggers, automotive systems, and remote data acquisition.

The working principle of the AD7703BR is based on the delta-sigma modulation technique. This technique involves the conversion of analog signals into a sequence of integer values by encoding the analog signal into a digital train known as a delta-sigma bit stream. This bit stream is then fed into a low-pass filter, which then generates the equivalent digital code.

The process begins by sampling an incoming analog signal using an on-chip track-and-hold circuit. The analogue voltage is then converted into a series of multi-level signals by a delta-sigma modulator. Each level is represented by a binary number which is used to generate a pulse-width-modulated (PWM) signal. This signal is then filtered using an asynchronous low-pass filter, which produces a digital output code representing the input signal.

The ADC circuit features an on-chip reference that enables it to perform accurate conversions even with changes in supply voltage. This reference is stable over temperature, enabling accurate conversion results over a wide range of temperatures. The ADC also has a programmable gain setting, allowing the user to adjust the conversion range.

The AD7703BR is designed to be easy to use, with an integrated SPI/I2C digital interface for communication, making it ideal for digital systems that require an ADC. The device is also low power, consuming only 60 µA with a TD (Temperature Drift) of only 0.3°C/°C over the full operational range.

The AD7703BR offers a versatile and accurate single channel ADC solution for applications requiring high-resolution analog-to-digital conversion. Its features such as a low power consumption, on-chip reference, programmable gain, and versatile digital interface make it a versatile and easy-to-use device for a wide range of data acquisition applications.

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