LM6132/LM6134
Typical Applications
(Continued)
DS012349-44
FIGURE 7.
FLAT PANEL DISPLAY BUFFERING
Three features of the LM6132/34 make it a superb choice for
TFT LCD applications. First, its low current draw (360 µA per
amplifier
@
5V) makes it an ideal choice for battery powered
applications such as in laptop computers. Second, since the
device operates down to 2.7V, it is a natural choice for next
generation 3V TFT panels. Last, but not least, the large ca-
pacitive drive capability of the LM6132 comes in very handy
in driving highly capacitive loads that are characteristic of
LCD display drivers.
The large capacitive drive capability of the LM6132/34 al-
lows it to be used as buffers for the gamma correction refer-
ence voltage inputs of resistor-DAC type column (Source)
drivers in TFT LCD panels. This amplifier is also useful for
buffering only the center reference voltage input of
Capacitor-DAC type column (Source) drivers such as the
LMC750X series.
Since for VGA and SVGA displays, the buffered voltages
must settle within approximately 4 µs, the well known tech-
nique of using a small isolation resistor in series with the am-
plifier’s output very effectively dampens the ringing at the
output.
With its wide supply voltage range of 2.7V to 24V), the
LM6132/34 can be used for a diverse range of applications.
The system designer is thus able to choose a single device
type that serves many sub-circuits in the system, eliminating
the need to specify multiple devices in the bill of materials.
Along with its sister parts, the LM6142 and LM6152 that
have the same wide supply voltage capability, choice of the
LM6132 in a design eliminates the need to search for mul-
tiple sources for new designs.
11
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
