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參數(shù)資料
| 型號： | AGT3209 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Temperature Compensating Gamma Trimster TM ATT3209 |
| 中文描述： | 溫度補償伽瑪Trimster商標ATT3209 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 642K |
| 代理商： | AGT3209 |
Alta Analog
ATT3209
Proprietary and Confidential
Page 6
Revision 2/7/2005
FUNCTIONAL DESCRIPTION
The ATT3209 is a programmable gamma
correction reference device with high drive
output buffers. The device can be easily
programmed prior to or during any phase of the
LCD-panel manufacturing process. The gamma
reference voltages are programmed and saved
on nonvolatile storage cells.
VGMA
Figure 1 shows a typical gamma correction
curve with 18 reference points. The ATT3209
V
GMA
outputs can be programmed to match any
point on the curve. The 9 outputs (V
GMA
0
through V
GMA
8
) approximate one half of the
curve.
Internal to the ATT3209, between V
REF
1 and
V
REF
2, there is a resistor string along which are
tap points that approximate a first order gamma
curve. The nominal V
GMA
reference voltages are
a ratio of the voltage differential between the
V
REF
inputs and are calculated by the following:
R
RATIO
* (V
REF
2-V
REF
1) +V
REF
1
.
The R
RATIO
values are shown in Table 1. The
nominal V
GMA
value can be trimmed ±1V by
programming, with the final value being stored
on a nonvolatile storage cell.
Because
approximate one half of the gamma curve the
V
REF
inputs are reversible with respect to which
is more positive. As an example: in order to
generate the points on the gamma curve shown
in Figure 1the ATT3209 generating V
GMA
0-V
GMA
8
would have its V
REF
1 tied to V
COM
and V
REF
2 tied
to A
VDD
. The ATT3209 generating V
GMA
9-
V
GMA
17 would have its V
REF
1 tied to V
COM
and
V
REF
2 tied to V
SS
. The V
GMA
buffers can drive
the outputs to within 200mV of A
VDD
and V
SS
.
the
resistor
string
is
fixed
to
Figure 1: Typical gamma correction curve.
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