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ADD8708WSTZ-REEL bảng dữ liệu(PDF) 10 Page - Analog Devices

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ADD8708
Rev. 0 | Page 10 of 16
APPLICATION NOTES
The ADD8708 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 18 gamma reference outputs
that can be mask-programmed in 0.2% increments using the
500 matched internal resistors (see Figure 20), so that every
point on the curve can be targeted within 0.1% of the desired
value.
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 20. 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
(see Figure 21). The ADD8708 allows the gamma curve in the
source drivers to be adjusted appropriately, and also ensures
that all the source drivers have the same gamma curve.
16
14
12
10
PANEL GAMMA CURVE
CORRECTED BY ADD8708
ORIGINAL GAMMA CURVE
IN SOURCE DRIVERS
8
6
4
2
0
GAMMA REFERENCE INPUT POINTS
Figure 21. 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 ADD8708 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 ADD8708 uses a single resistor string consisting of 500
individual elements. The tap points are mask programmable
and completely independent of each other. See the Tap Point
and Regulator Voltage Request Form in this data sheet.
VREG OUT
VOUTX
VINX
500–TPX
TPX
Figure 22. Gamma Buffers Tap Point Circuit
Tap point voltages can be derived from the following equation:
OUT
REG
X
OUT
V
TP
X
V
×
=
500
where TPX is the desired tap point for the Xth channel.
Table 5. Typical Mask Implementation1
VDD = 16 V, VREG OUT = 14.4 V, 0 ≤ X ≤ 500
Tap Point (X)
Voltage
Units
VOUT18
500
14.400
V
VOUT17
396
11.405
V
VOUT16
369
10.627
V
VOUT15
361
10.397
V
VOUT14
354
10.195
V
VOUT13
350
10.080
V
VOUT12
341
9.821
V
VOUT11
317
9.130
V
VOUT10
299
8.611
V
VOUT9
225
6.480
V
VOUT8
211
6.077
V
VOUT7
177
5.098
V
VOUT6
167
4.810
V
VOUT5
163
4.694
V
VOUT4
154
4.435
V
VOUT3
146
4.205
V
VOUT2
118
3.398
V
VOUT1
7
0.202
V
_______________________________
1ADD8708 release samples do not have these typical values. The values on the
samples are nonmonotonic and can be provided upon request.


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