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LM8342SD датащи(PDF) 14 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM8342SD
подробное описание детали  Programmable TFT VCOM Calibrator with Non-Volatile
PDF  16 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM8342SD датащи(HTML) 14 Page - National Semiconductor (TI)

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Typical Application (Continued)
The voltage level of the V
COM driver, for a general setting of
(DAC
10) , is calculated using Equation (4).
(4)
For calibrating the V
COM level (see Figure 8) the tuning
range of the design needs to be aligned to the required V
COM
tuning range (
∆V
COM). Figure 9 gives a graphical presenta-
tion of the desired voltage levels.
Assume the calibrator needs to cover the voltage range
given in Equation (5).
(5)
The limits of V
COM
for DAC
10
= 0 (high limit) and
DAC
10 = 127 (low limit) are given by:
(6)
(7)
Using Equation (5),Equation (6), and Equation (7) the value
for resistors R1 and R2 can be obtained, resulting in Equa-
tion (8) and Equation (9):
(8)
and
(9)
Table 4 gives an overview of resistor values for a typical
value of AV
DD,and2RSET values. All settings are for a VCOM
level at V
MID =
1
⁄2 AV
DD, and a maximum variation of
∆V
COM.
(10)
20139201
FIGURE 8. Typical Application Driving a V
COM Level
20139234
FIGURE 9. V
COM Voltage Levels
www.national.com
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