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High precision D/A conversion circuit

An analog conversion, high-precision technology, applied in the direction of digital-to-analog converter, electrical digital data processing, data processing input/output process, etc., can solve the problem that it is difficult to meet the high requirements of analog signals, 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 digital / analog converter, due to the limitation of chip pins and volume, the number of conversion bits is usually 8 or 10 bits, and the conversion accuracy is low, so it is difficult to meet the high requirements for analog signals. occasion
In some occasions, the DSP serial port is directly connected to the serial input digital / analog conversion chip, 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 with reference to the accompanying drawings and embodiments.

[0017] like figure 1 As shown, the structural block diagram of the present invention is represented by the attached figure 1 given. It includes: 24-bit high-precision digital / analog conversion circuit 1 and FPGA programmable logic circuit 2.

[0018] like figure 2 Shown: high-precision digital / analog conversion circuit: using CS43122 chip. Mode selection M0, M2, M3 are connected to high level, M1 is connected to low level, and M4 is connected to FPGA programmable logic circuit 2. The chip works in MODE1 mode, and the serial digital interface works in FORMAT1 state. Analog differential output CH1OUTL+, CH1OUTL- and CH2OUTL+, CH2OUTL- and analog signal conditioning circuit interface. The reset signal / DARST, the mute enable signal / DAMUTE, and the mute output control signal / DAMUTEC are connected to the FPGA programmable logic circuit 2 . The digita...

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Abstract

A high accurate D / A conversion circuit connects its all signal leading out wires to FPGA programmable logic circuit. The prepared circuit gas high D / A conversion accuracy with conversion cipher of 24 positions, harmonic distortion of minus 102dB, dynamic range of 122dB and high S - N ratio since it applies serial input for D / A conversion.

Description

technical field [0001] The invention relates to a digital / analog conversion circuit, which is a high-precision digital / analog conversion circuit applied to a digital signal generator and a digital controller. Background technique [0002] In the traditional digital format conversion circuit based on digital / analog 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 precision is low, which is difficult to meet the requirements for analog signals. occasion. In some occasions, the DSP serial port is directly connected to the serial input digital / analog conversion chip, which makes the digital format conversion occupy CPU processing time and has poor scalability. SUMMARY OF THE INVENTION [0003] The invention provides a high-precision digital / analog conversion circuit, which can meet the requirement of high conversion precision. [0004] The technical scheme adopted by the present invention...

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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