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| BUF11702 Datasheet, PDF (15/24 Pages) Burr-Brown (TI) – MULTI CHANNEL LCD GAMMA CORRECTION BUFFER | |||
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www.ti.com
APPLICATION INFORMATION
The requirements on the number of gamma correction
channels vary greatly from panel to panel. Therefore,
the BUFxx702 series of gamma correction buffers
offers different channel combinations. The BUF11702
offers 10 gamma channels plus one VCOM channel,
whereas the BUF07702 provides six gamma channels
plus one VCOM. The VCOM channel on both models can
be used to drive the VCOM node on the LCD panel.
BUF11702
BUF07702
SLOS359F â MARCH 2001 â REVISED MAY 2004
Gamma correction voltages are often generated using
a simple resistor ladder, as shown in Figure 44. The
BUFxx702 buffers the various nodes on the gamma
correction resistor ladder. The low output impedance of
the BUFxx702 forces the external gamma correction
voltage on the respective reference node of the LCD
source driver. Figure 44 shows an example of the
BUFxx702 in a typical block diagram driving an LCD
source driver with 10- or 6-channel gamma correction
reference inputs.
Figure 44. LCD Source Driver Typical Block Diagram
15
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