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AD8389 датащи(PDF) 7 Page - Analog Devices |
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AD8389 датащи(HTML) 7 Page - Analog Devices |
7 / 12 page AD8389 Rev. 0 | Page 7 of 12 OPERATING PRINCIPLES MONITRI DXRO DXI AD8389 VCONTR CLX, ENBX(1–4) CLXRO, ENBX(1–4)O 200pF DX AD8384/AD8385 LEVEL SHIFTER SECTION DXI DXO MONITI MONITO CLXO, CLXIN, ENBX(1–4)I ENBX(1–4)O RED LCD H SHIFT REGISTER MON Figure 6. AD8389 Application in the Red Channel of an LCD Projection System The image quality of an LCD system is dependent on the timing relationship between the control inputs, DX, CLX, ENBX(1–4), and the video channels. TFT delay and switching speed variations, due to temperature variations and LCD aging, degrade image quality if not compensated. An internal reference TFT connected to an internal pull-up resistor, as shown in Figure 6, characterizes the internal S/H TFTs of the LCD and monitors switching speed and delay variations due to aging and temperature. When the MON output of an LCD that includes such an internal reference TFT is connected to the reference input of the AD8389 delay-locked timing loop, continuously optimized timing of the LCD is maintained automatically. OPERATION As part of a closed loop, the AD8389 maintains a constant delay between the common input, DXI, and each independent feedback reference, MONITxI. The block diagram of such closed-loop system is shown in Figure 6. A constant delay, t7, selected via the COMPEDGE and SLOW control inputs, is applied to the DXI input to approximate the nominal, initially expected total delay, t7, through the level shifters and the LCD as shown in Table 5. Table 5 COMPEDGE SLOW Constant Delay 1 0 15/fCLK + t4 1 1 9/fCLK + t4 0 0 32/fCLK + t4 0 1 26/fCLK + t4 CONSTANT DX MONITRI CONSTANT DX MONITRI |
Аналогичный номер детали - AD8389 |
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Аналогичное описание - AD8389 |
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