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Digital soft switch in D/A converter and using method thereof

A digital-to-analog converter and soft-switching technology, applied in the field of audio digital-to-analog conversion, can solve problems such as DAC noise of the audio digital-to-analog converter, and achieve the effect of solving the noise problem

Active Publication Date: 2005-04-06
苏州顺芯半导体有限公司
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Problems solved by technology

[0011] The purpose of the present invention is to propose a new numerical control scheme, which can be used to solve the digital soft switch in a digital-to-analog converter of the audio digital-to-analog converter DAC in the conversion process of the normal and power-saving mode. and how to use it

Method used

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  • Digital soft switch in D/A converter and using method thereof
  • Digital soft switch in D/A converter and using method thereof
  • Digital soft switch in D/A converter and using method thereof

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Embodiment Construction

[0041] The implementation of the digital soft switch in the digital-to-analog converter and its usage method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] A new numerical control scheme using digital soft-switching can solve the noise problem in the transition process of DAC normal and power-saving mode operation.

[0043] An audio digital-to-analog converter DAC is a silicon tube chip 100, including: a chip state machine CSM10, an audio serial port 1, a serial control port 12, two volume control units 2, 6, and two de-emphasis / interpolation filters 3, 7, two multi-bit Σ-Δ regulators DSM and dynamic element matching units DEM4, 8, two output amplification low-pass filters SCF5, 9, a switch 14 connected to the PDNn pin, zero detector / silence controller 11. Clock manager / sampling rate detector 11, wherein:

[0044] The switch 14 connected to the PDNn pin is a digital soft switch.

[0045] see image 3 , the ...

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Abstract

It is a digit / analogue digital soft switch and its method , which comprises the following steps: to switch user audio frequency data and maximum negative signal to the selector on the audio digit / analogue converter silicon chip; to send the output signal of selector to volume control unit; the volume control unit is in the charge of CSM and reflects signals to the CSM; CSM controls the volume control unit to control the switch of selector; the serial control port is to control the volume unit attenuation value speed and user volume; the volume control unit signal is output to the said aggravation / plug filter.

Description

(1) Technical field [0001] The invention relates to the field of audio digital-to-analog conversion (DAC), in particular to a digital soft switch in a digital-to-analog converter and a method for using the same. (2) Background technology [0002] Sigma-delta data conversion technology is a technology widely used in high-precision audio digital-to-analog conversion. The audio digital-to-analog converter DAC utilizing the sigma-delta data conversion technique is on a silicon tube chip 100 (see figure 1 ), mainly consists of the following modules: including chip state machine CSM10, audio serial port 1 connected to SDATA, SCLK, LRCK pins, connected to SDM1 / SPI_CLK / SCL, SDM0 / SPI_DIN / SDA, DEM0 / SPI_CSn / ADR0 pins Serial control port 12, two volume control units 2, 6, two de-emphasis / interpolation filters 3, 7, two multi-bit Σ-Δ regulators DSM and dynamic element matching units DEM4, 8, connected to output AOUTL, Two output amplifying low-pass filters (analog switched capacitor fi...

Claims

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Application Information

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IPC IPC(8): H03M1/66H03M3/00
Inventor 林坤王燕於清
Owner 苏州顺芯半导体有限公司
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