ViewSonic VA1912W Service Manual - Page 19

Circuit Description

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UPC - 766907167313
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4. Circuit Description The TSUM17AK is total solution graphics processing IC for LCD monitors with panel resolutions up to SXGA. It is configured with a high-speed integrated triple-ADC/PLL,, a high quality display processing engine, and an integrated output display interface that can support RSDS panel interface format. To further reduce system costs, the TSUM17AK also integrates intelligent power management control capability for green-mode requirements and spread- spectrum support for EMI management. The TSUM17AK incorporates the world's first coherent oversampled RGB graphics ADC in a monitor controller system. The oversampling ADC samples the input RGB signals at a frequency that is much higher than the signal source pixel rate. This can preserve details in the video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in non-oversampled systems. The TSUM17AK also incorporates a new Dynamic Frame Rate (DFR) generator for the digital output video to the display panel that preserves the advantages of a fixed output clock rate, while eliminating the output end of frame short-line. ViewSonic Corporation 16 Confidential - Do Not Copy VA1912w-2_VA1912wb-2

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ViewSonic Corporation
4. Circuit Description
16
Confidential - Do Not Copy
VA1912w-
2
_VA1912wb-
2
The TSUM17AK is total solution graphics processing IC for LCD monitors with panel resolutions up to SXGA. It is configured with
a high-speed integrated triple-ADC/PLL,, a high quality display processing engine, and an integrated output display interface that can
support RSDS panel interface format. To further reduce system costs, the TSUM17AK also integrates intelligent power management
control capability for green-mode requirements and spread- spectrum support for EMI management.
The TSUM17AK incorporates the world’s first coherent oversampled RGB graphics ADC in a monitor controller system. The
oversampling ADC samples the input RGB signals at a frequency that is much higher than the signal source pixel rate. This can
preserve details in the video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in non-oversampled
systems. The TSUM17AK also incorporates a new Dynamic Frame Rate (DFR) generator
for the digital output video to the display
panel that preserves the advantages of a fixed output clock rate, while eliminating the output end of frame short-line.