A σ-δ based analog-to-digital conversion circuit, adc chip and digital balance
An analog-to-digital conversion circuit and analog-to-digital conversion technology, applied in the electronic field, can solve the problems of ADC and digital balance with high low power consumption requirements, and achieve the effect of reducing power consumption
Active Publication Date: 2017-01-11
CHIPSEA TECH SHENZHEN CO LTD
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[0005] The purpose of the embodiment of the present invention is to provide an analog-to-digital conversion circuit based on the Sigma-Delta structure, which aims to solve the problem that the current market has increasingly high demand for low power consumption of ADCs and digital balances
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0018] In the embodiment of the present invention, the reference voltage unit is controlled by the control logic unit to turn off the output of the reference voltage when the Sigma-ADC modulator is not working, which effectively reduces the power consumption of the analog-to-digital conversion circuit, and conforms to the mainstream and social development of energy saving and environmental protection. Market demand.
[0019] The realization of the present invention is described in detail below in conjunction with specific embodiment:
[0020] figure 1 The structure of the analog-to-digital conver...
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The invention belongs to the field of integrated circuits, and provides an ADC chip, a digital scale and an analog-digital conversion circuit based on a Sigma-Delta structure. The analog-digital conversion circuit comprises a control logic unit, a reference voltage unit, a Sigma-ADC modulator and a filtering unit. The control logic unit is used for generating power source enable signals, analog-digital conversion enable signals and filtering control enable signals. The reference voltage unit is used for outputting a reference voltage when the power source enable signals are valid. The Sigma-ADC modulator is used for regarding the reference voltage as a working voltage and converting analog voltage signals into pulse density modulation codes when the analog-digital conversion enable signals are valid. The filtering unit is used for filtering the pulse density modulation codes when the filtering control enable signals are valid and outputting digital signals. According to the analog-digital conversion circuit, the control logic unit is used for controlling the reference voltage unit to stop outputting the reference voltage under the situation that the Sigma-ADC modulator does not work, and the power consumption of the analog-digital conversion circuit is effectively reduced.
Description
technical field [0001] The invention belongs to the field of electronics, and in particular relates to an analog-to-digital conversion circuit based on a Sigma-Delta (Σ-Δ) structure, an ADC chip and a digital balance. Background technique [0002] With the increasing number of digital products today, the role of Analog to Digital Converter (ADC) is becoming more and more important, and the ADC with Sigma-Delta (also known as Σ-Δ) structure is characterized by its high resolution, high The advantages of integration and low price are widely used in the field of process control and DC measurement, especially in the field of weighing. [0003] At present, sensors are used in digital balances to collect weight information, and the information is converted into digital signals in the form of analog signals through Sigma-Delta ADC for further data processing. As a core technology, Sigma-Delta ADC has a great influence on to the accuracy and power consumption of the digital balance...
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IPC IPC(8): H03M1/12
Inventor 乔爱国
Owner CHIPSEA TECH SHENZHEN CO LTD