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ADD8708 Datasheet

  • ADD8708

  • 18-Channel Gamma Buffer with Regulator

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18-Channel Gamma Buffer
with Regulator
ADD8708
FEATURES
18 precision gamma reference outputs
Mask-programmable gamma resistors:
0.2% resolution and 0.1% accuracy
Mask-programmable voltage regulator: 0.4% accuracy
Upper 9 buffers swing to V
DD
Lower 9 buffers swing to GND
Single-supply operation: 7.5 V to 16.5 V
Gamma current drive: 15 mA per channel
Peak output current: 150 mA
Output voltage stable under load conditions
Pin-to-pin compatible with ADD8709
48-lead, Pb-free LQFP and LFCSP
FUNCTIONAL BLOCK DIAGRAM
MASK-PROGRAMMABLE
REGULATOR RESISTORS
FB
700鈩?
V
REG OUT
V
DD
V
DD
GND
+
鈥?/div>
GAMMA
BUFFERS
1.2V
700鈩?
V
IN
18
700鈩?
V
IN
17
700鈩?
V
IN
16
700鈩?
V
IN
15
700鈩?
V
IN
14
700鈩?
V
IN
13
V
OUT
18
V
OUT
17
V
OUT
16
V
OUT
15
V
OUT
14
V
OUT
13
V
OUT
12
V
OUT
11
V
OUT
10
V
OUT
9
V
OUT
8
V
OUT
7
V
OUT
6
V
OUT
5
V
OUT
4
V
OUT
3
V
OUT
2
V
OUT
1
APPLICATIONS
LCD TV panels
LCD monitor panels
GENERAL DESCRIPTION
The ADD8708 is an 18-channel integrated gamma reference for
use in high resolution LCD TV and monitors panels. The out-
put buffers feature high current drive and low offset voltage to
provide an accurate and stable gamma curve. The top nine
channels swing to V
DD
; the lower nine channels swing to GND.
Integrating the gamma setup resistors drastically reduces the
external component count while increasing the gamma curve
accuracy. To accommodate multiple column drivers and panel
architectures, the ADD8708 is mask programmable to a 0.2%
resolution using the on-chip 500 resistor string. An on-board
voltage regulator provides a fixed input for the resistor string,
isolating the gamma curve from the supply ripple.
The ADD8708 is specified over the temperature range of
鈥?0擄C to +105擄C and comes in both a 48-lead, Pb-free,
lead-frame chip-scale package and a Pb-free, low-profile,
quad flat package.
700鈩?
V
IN
12
700鈩?
V
IN
11
700鈩?
V
IN
10
700鈩?
V
IN
9
700鈩?
V
IN
8
700鈩?
V
IN
7
700鈩?
V
IN
6
700鈩?
V
IN
5
700鈩?
V
IN
4
700鈩?
V
IN
3
700鈩?
V
IN
2
700鈩?
V
IN
1
MASK-PROGRAMMABLE
RESISTOR STRING
*ESD PROTECTION RESISTORS
GND GND
Figure 1. 48-Lead LQFP or LFCSP
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
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
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
漏 2004 Analog Devices, Inc. All rights reserved.
04614-001

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