High precision A/D conversion circuit

A digital conversion, high-precision technology, applied in the direction of analog-to-digital converters, electrical digital data processing, data processing input/output process, etc., can solve the problem that it is difficult to meet the high requirements of data acquisition, occupy CPU processing time, and be scalable Poor performance and other issues, to achieve the effect of low power consumption, high precision, and short development cycle

Inactive Publication Date: 2005-11-16
杭州忆恒科技有限公司
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AI Technical Summary

Problems solved by technology

[0002] In the traditional digital format conversion circuit based on the analog / digital converter, due to the limitation of chip pins and volume, the number of conversion bits is usually 8 bits or 10 bits, and the conversion accuracy is low, so it is difficult to meet the high requirements for data acquisition. occasion
In some occasions, the analog / digital conversion chip that uses serial output is directly connected to the CPU, resulting in digital format conversion taking up CPU processing time and poor scalability

Method used

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Such as figure 1 As shown, the structural block diagram of the present invention is attached figure 1 Given. The signal lead wires including the high-precision analog / digital conversion circuit 1 are all connected to the FPGA programmable logic circuit 2.

[0018] Such as figure 2 As shown, the high-precision analog-to-digital conversion circuit: AK5393 analog-to-digital conversion chip 1. The chip has two analog differential signal inputs CH1AIL+, CH1AIL- and CH2AIL+, CH2AIL-. The SMODE1 and SMODE2 of the chip are connected to a high level, and the serial digital interface of the AK5393 chip is set to MASTERMODE. The reset signal / ADRST, the calibration signal AD1ZCAL, the high-pass filter enable AD1HPFE, and the dual-speed sampling enable AD1DFS are connected to the FPGA programmable logic circuit 2. Analog-to-digital conversion circuit serial digital bus AD...

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Abstract

A high accurate A / D conversion circuit connects its all signal leading out wires to FPGA programmable logic circuit. The prepared circuit has high accuracy of A / D conversion with conversion cipher of 24 position, S - N ratio of 117 dB and dynamic range of 117 dB since it applies serial output after A / D conversion is finished.

Description

Technical field [0001] The invention relates to a data acquisition system, which is a high-precision analog / digital conversion circuit applied to a data acquisition instrument, a digital control instrument and an audio processing device. Background technique [0002] In the traditional digital format conversion circuit based on analog / digital converter, due to the limitation of chip pin and volume, the conversion digits are usually 8 or 10 bits, the conversion accuracy is low, and it is difficult to meet the higher requirements for data acquisition. occasion. In some occasions, the analog / digital conversion chip using serial output is directly connected to the CPU, causing the digital format conversion to take up CPU processing time and poor scalability. Summary of the invention [0003] The invention provides a high-precision analog / digital conversion circuit to realize high-precision data collection. [0004] The technical scheme adopted by the present invention is that the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/05
Inventor 贺惠农
Owner 杭州忆恒科技有限公司
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