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Analog Devices - 12-Channel Gamma Buffers with VCOM and Regulator

Numéro de référence ADD8707
Description 12-Channel Gamma Buffers with VCOM and Regulator
Fabricant Analog Devices 
Logo Analog Devices 





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ADD8707 fiche technique
FEATURES
12 precision gamma reference outputs
Mask-programmable gamma resistors:
0.2% resolution and 0.1% accuracy
Mask programmable voltage regulator: 0.4% accuracy
Upper 6 buffers swing to VDD
Lower 6 buffers swing to GND
Single-supply operation: 7.5 V to 16 V
Gamma current drive: 15 mA per channel
VCOM peak output current: 250 mA
Outputs stable under load conditions
48-lead, Pb-free LFCSP package
APPLICATIONS
LCD TV panels
LCD monitor panels
PRODUCT OVERVIEW
The ADD8707 is a 12-channel integrated gamma reference with
VCOM for use in LCD TV and monitor panels. The output
buffers feature high current drive and low offset voltage to
provide an accurate and stable gamma curve. The top six
channels swing to VDD and the lower six 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 ADD8707 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 supply ripple.
The ADD8707 is specified over the temperature range of
–40°C to +105°C and comes in a 48-lead, Pb-free, lead frame
chip-scale package.
12-Channel Gamma Buffers
with VCOM and Regulator
ADD8707
FUNCTIONAL BLOCK DIAGRAM
MASK-PROGRAMMABLE
REGULATOR RESISTORS
FB
700*
GND
+
1.2V
VIN11
VIN10
VIN8
VIN7
VIN6
VIN5
700*
700*
MASK-
PROGRAMMABLE
GAMMA RESISTORS
700*
700*
700*
700*
VIN3
VIN2
VIN1
700*
700*
700*
VCOM
GAMMA
BUFFERS
VCOM OUT
VOUT12
VOUT11
VOUT10
VOUT9
VOUT8
VOUT7
VOUT6
VOUT5
VOUT4
VOUT3
VOUT2
VOUT1
*ESD PROTECTION RESISTORS
Figure 1. 48-Lead LFCSP
Rev. A
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 © 2004 Analog Devices, Inc. All rights reserved.

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