18-Channel Gamma Buffer
with Regulator
ADD8709
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Integrated voltage regulator
48
47
46
45
44
43
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38
37
Upper/lower buffers swing to VDD/GND
Single-supply operation: 7.5 V to 16.5 V
Continuous current drive: 15 mA
High peak output current: 150 mA
Low offset voltage: 15 mV max
1
2
36
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33
32
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30
29
28
27
26
25
V
REG
3
4
Output voltage stable under transient load conditions
5
APPLICATIONS
TFT LCD monitor panels
TFT LCD TV panels
6
18
18
7
8
GENERAL DESCRIPTION
9
The ADD8709 is an 18-channel gamma reference for use in
high-resolution TFT LCD monitor and TV panels. The output
buffers feature low offset voltage and high current drive under
transient load conditions to provide a more accurate and stable
gamma curve. Two channels swing to VDD and two channels
swing to GND, increasing the overall range of the curve. An
on-board voltage regulator is available for external applications.
Here again, external component costs are reduced and the
quality of the gray scale is increased.
10
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18
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Figure 1. 48-Lead LQFP
The ADD8709 is specified over the temperature range of
–40°C to +100°C and comes in a robust, low profile quad
flat package.
Rev. 0
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