參數(shù)資料
型號(hào): LM8342SD
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 消費(fèi)家電
英文描述: Programmable TFT VCOM Calibrator with Non-Volatile
中文描述: SPECIALTY CONSUMER CIRCUIT, DSO10
封裝: LLP-10
文件頁(yè)數(shù): 14/16頁(yè)
文件大?。?/td> 951K
代理商: LM8342SD
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
level (see
Figure 8
) the tuning
range of the design needs to be aligned to the required V
tuning range (
V
).
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 ofAV
DD
, and 2 R
SET
values.All settings are for a V
COM
level at V
MID
=
1
2
AV
DD
V
COM
.
(10)
20139201
FIGURE 8. Typical Application Driving a V
COM
Level
20139234
FIGURE 9. V
COM
Voltage Levels
L
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