18-Channel Gamma Buffer
with Regulator

ADD8709


Rev. 0
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However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
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Tel: 781.329.4700 www.analog.com
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FEATURES
Integrated voltage regulator
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
Output voltage stable under transient load conditions

APPLICATIONS
TFT LCD monitor panels
TFT LCD TV panels

GENERAL DESCRIPTION
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.
The ADD8709 is specified over the temperature range of
–40°C to +100°C and comes in a robust, low profile quad
flat package.
FUNCTIONAL BLOCK DIAGRAM
1818
V
REG
13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37
1
2
3
4
5
6
7
8
9
10
11
12
36
35
34
33
32
31
30
29
28
27
26
25
04715-
0
-
001

Figure 1. 48-Lead LQFP