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PDF LMC6009 Data sheet ( Hoja de datos )
| Número de pieza | LMC6009 | |
| Descripción | 9 Channel Buffer Amplifier for TFT-LCD | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1999
LMC6009
9 Channel Buffer Amplifier for TFT-LCD
General Description
The LMC6009 is a CMOS integrated circuit that buffers 9 ref-
erence voltages for gamma correction in a Thin Film Transis-
tor Liquid Crystal Display (TFT-LCD). Guaranteed to operate
at both 3.3V and 5V supplies, this integrated circuit contains
nine, independent unity gain buffers that can source 130 mA
into a capacitive load without oscillation.
The LMC6009 is useful for buffering gamma voltages into
column drivers that employ the resistor-divider architecture.
High output current capability and fast settling characteristics
of this device improve display quality by minimizing rise time
errors at the outputs of the column driver. The integration of
nine buffers and a multiplexer eliminates the need for dis-
crete buffers and a separate multiplexer (MUX) chip on the
panel.
The LMC6009 is available in 48-pin surface mount TSSOP.
Features
n Number of inputs
n 3.3V and 5V operation
n Supply current
n Settling time
n A/B channel inputs for asymmetrical Gamma
n Number of outputs
n Number of control inputs
n Built-in thermal shutdown protection
Applications
n VGA/SVGA TFT-LCD drive circuits
n Electronic Notebooks
n Electronic Games
n Personal Communication Devices
n Personal Digital Assistants (PDA)
18
3.5 mA
3 µs
9
1
Application in VGA/SVGA TFT-LCD
Ordering Information
Package
48-pin TSSOP
Temperature Range
−20˚C–+75˚C
LMC6009MT
LMC6009MTX
Transport Media
Tape and Reel
DS012533-1
NSC Drawing
MTD48
© 1999 National Semiconductor Corporation DS012533
www.national.com
1 page  
Block Diagram
FIGURE 6. Block Diagram of LMC6009
DS012533-8
Applications
The LMC6009 is useful for buffering the nine reference volt-
ages for gamma correction in a TFT-LCD as shown in
Figure 7. The A/B channel inputs allow the user to alternate
two sets of gamma references to compensate for asymmetri-
cal Gamma characteristic during Row Inversion. The
LMC6009 eliminates the need for nine external switches or
an 18-to-9 multiplexer.
Since the buffers in the LMC6009 draw extremely low bias
current (1.5 µA max), large resistance values can be used in
the reference voltage string. This allows the power dissipa-
tion in the gamma reference circuit to be minimized. The
nine buffers are guaranteed to deliver 80 mA to the load, al-
lowing the pixel voltages of the TFT-LCD to settle very
quickly.
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