buf06703 Datasheet, PDF (15/25 Pages) Burr-Brown (TI) – MULTI-CHANNEL LEC GAMMA CORRECTION BUFFER

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APPLICATION INFORMATION
The requirements on the number of gamma correction
channels vary greatly from panel to panel. Therefore, the
BUFxx703 series of gamma correction buffers offers
different channel combinations. The V_COM channel can be
used to drive the V_COM node on the LCD panel.
Gamma correction voltages are often generated using
a simple resistor ladder, as shown in Figure 35. The
BUF07703
BUF06703
BUF05703
SBOS269A – MARCH 2003 – REVISED JUNE 2003
BUFxx703 buffers the various nodes on the gamma
correction resistor ladder. The low output impedance of
the BUFxx703 forces the external gamma correction
voltage on the respective reference node of the LCD
source driver. Figure 35 shows an example of the
BUFxx703 in a typical block diagram driving an LCD
source driver with 6-channel gamma correction
reference inputs.
Figure 35. LCD Source Driver Typical Block Diagram.
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