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參數資料
型號: ADD8707WCPZ-REEL7
廠商: ANALOG DEVICES INC
元件分類: 運動控制電子
英文描述: Circular Connector; No. of Contacts:4; Series:LJT00R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:15-4
中文描述: 12 BUFFER AMPLIFIER, QCC48
封裝: LEAD FREE, MO-220-VKKD, LFCSP-48
文件頁數: 12/20頁
文件大小: 654K
代理商: ADD8707WCPZ-REEL7
ADD8707
APPLICATION NOTES
The ADD8707 is a mask-programmable gamma reference
generator that allows source drivers to be optimized for the
different combinations of liquid crystals, glass sizes, etc. in
large LCD panels. It generates 12 gamma reference outputs
that can be mask-programmed in 0.2% increments using the
500 matched internal resistors (Figure 23), so that every point
on the curve can be targeted within 0.1% of the desired value.
Rev. A | Page 12 of 20
0
TAP POINT 4
TAP POINT 3
TAP POINT 2
TAP POINT 1
TAP POINT 500
TAP POINT 499
TAP POINT 498
TAP POINT 497
EACH R = 30
TYPICALLY
Figure 23. 500 Mask-Programmable Resistor String
In a typical panel application, the selected source drivers have
an internal gamma curve that is not ideal for the specific panel
(Figure 24). The ADD8707 allows the gamma curve in the
source drivers to be adjusted appropriately, and also insures that
all the source drivers have the same gamma curve.
16
14
12
10
PANEL GAMMA CURVE
CORRECTED BY ADD8707
OIN SOURCE DRIVERS
8
6
4
2
0
0
GAMMA REFERENCE INPUT POINTS
G
Figure 24. Original and Corrected Gamma Curves
The matching and tracking accuracy of the internal resistors is
typically 0.1% with worst-case deviation from the desired curve
within 0.4% of the ideal gamma curve, over temperature.
The ADD8707 also includes a low dropout linear regulator to
provide a stable reference level for the gamma curve for
optimum panel performance.
TAP POINT SELECTION
The ADD8707 uses a single resistor string consisting of 500
individual elements. The tap points are mask programmable
and completely independent of each other. Refer to the Tap
Point and Regulator Voltage Request Form in this data sheet.
0
V
REG OUT
V
OUT
X
V
IN
X
500–TP
X
TP
X
Figure 25. Gamma Buffers Tap Point Circuit.
Tap point voltages can be derived from the following equation:
TP
V
×
=
500
OUT
REG
X
X
OUT
V
where
TP
X
is the desired tap point for the
X
th
channel.
Table 5. Typical Mask Implementation
V
DD
= 16 V, V
REG OUT
= 14.4 V, 0 ≤ X ≤ 500
Tap Point (X)
V
OUT
12
500
V
OUT
11
419
V
OUT
10
365
V
OUT
9
349
V
OUT
8
343
V
OUT
7
297
V
OUT
6
213
V
OUT
5
173
V
OUT
4
163
V
OUT
3
146
V
OUT
2
95
V
OUT
1
7
Voltage
14.400
12.067
10.512
10.051
9.878
8.554
6.134
4.982
4.694
4.205
2.736
0.202
Units
V
V
V
V
V
V
V
V
V
V
V
V
相關PDF資料
PDF描述
ADD8708 18-Channel Gamma Buffer with Regulator
ADD8708WCPZ-REEL7 18-Channel Gamma Buffer with Regulator
ADD8708WSTZ-REEL 18-Channel Gamma Buffer with Regulator
ADD8709 18-Channel Gamma Buffer with Regulator
ADD8709ASTZ-REEL 18-Channel Gamma Buffer with Regulator
相關代理商/技術參數
參數描述
ADD8707WCPZ-TR 制造商:Analog Devices 功能描述:MASK PROGRAMMABLE 12 CHAN-BUFFER - Tape and Reel
ADD8708 制造商:AD 制造商全稱:Analog Devices 功能描述:18-Channel Gamma Buffer with Regulator
ADD8708ACPZ 制造商:Analog Devices 功能描述:18 CHANNEL PROGRAMMABLE GAMMA BUFFER WITH REGULATOR - Bulk
ADD8708ASTZ-REEL 制造商:Analog Devices 功能描述:
ADD8708WCPZ-REEL7 制造商:AD 制造商全稱:Analog Devices 功能描述:18-Channel Gamma Buffer with Regulator
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