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AD8389 Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças AD8389
Descrição Electrónicos  Triple, 6-Channel LCD Timing Delay-Locked Loop
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD8389 Folha de dados(HTML) 7 Page - Analog Devices

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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


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