Analog-to-digital conversion device, method and touch device
A digital conversion, digital converter technology, applied in the direction of analog/digital conversion, code conversion, electrical digital data processing, etc., can solve the problems of digital value error, panel power supply voltage TPVDD fluctuation, interference, etc.
Active Publication Date: 2014-07-16
REALTEK SEMICON CORP
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Problems solved by technology
[0007] However, when the handheld mobile communication device transmits and receives signals, it will also cause interference to the panel power supply voltage TPVDD, causing the panel power supply voltage TPVDD to fluctuate
The voltage division generated by the touch panel 11 has a linear response to the fluctuation of the panel power supply voltage TPVDD, when the sample and hold circuit 13 is not used (such as figure 2 shown), the ratio of the input voltage of the successive approximation analog-to-digital converter 12 to the panel power supply voltage TPVDD is not affected by the fluctuation of the panel power supply voltage TPVDD, and the correct digital value can be converted, but when the sampling Hold circuit 13 when (as image 3 shown), the ratio of the input voltage of the successive approximation analog-to-digital converter 12 to the panel power supply voltage TPVDD will be affected by the fluctuation of the panel power supply voltage TPVDD, which will cause errors in the converted digital value
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[0049] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the four embodiments with reference to the drawings.
[0050] Before the present invention is described in detail, it should be noted that in the following description, similar components are denoted by the same numerals.
[0051] refer to Figure 4 , the first embodiment of the analog-to-digital conversion device 3 of the present invention is suitable for a touch panel 2, the touch panel 2 is applied with a panel power supply voltage TPVDD and a panel ground voltage TPGND, and generates a partial pressure.
[0052] This embodiment includes a first sample-and-hold circuit 31 , a second sample-and-hold circuit 32 and a well-known successive approximation analog-to-digital converter 33 .
[0053] Before the successive approximation analog-to-digital converter 33 converts, the first and second sample-and-hold ci...
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An analog-to-digital conversion device, method and touch device are suitable for converting a divided voltage, wherein the divided voltage is generated according to a power supply voltage and a ground voltage. The analog-to-digital conversion device includes: a first sample and hold circuit for sampling the divided voltage and holding the sampled divided voltage; a second sample and hold circuit for sampling the power supply voltage and holding the sampled voltage. The sampled power supply voltage; and an analog-to-digital converter for converting the maintained divided voltage into a digital value according to the maintained power supply voltage and the ground voltage; wherein the first and second sampling and maintaining The circuit performs a sampling operation before the analog-to-digital converter performs conversion, and performs a holding operation while the analog-to-digital converter performs conversion.
Description
technical field [0001] The present invention relates to an analog-to-digital conversion device, a method, and a touch-sensitive device, in particular to an analog-to-digital conversion device, a method, and a touch-sensitive device that are not affected by voltage source disturbances. Background technique [0002] refer to figure 1 , a touch panel (Touch Panel) 11 includes a plurality of resistors (not shown) distributed in a mesh shape, and its two sides perpendicular to a first direction X are respectively applied with a panel power supply voltage TPVDD and a panel ground voltage TPGND , and the two sides perpendicular to a second direction Y are respectively applied with the panel power voltage TPVDD and the panel ground voltage TPGND. When the touch panel 11 is pressed, according to the principle of resistive voltage division, along the first direction X and the second direction Y, a voltage between the panel power supply voltage TPVDD and the panel ground voltage TPGND...
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IPC IPC(8): H03M1/06H03M1/38H03M1/40G06F3/045
Inventor 闵绍恩
Owner REALTEK SEMICON CORP