1FEATURES
2• Gamma Buffers 1-2 Swing to VDD
• Gamma Buffers 17-18 Swing to VSS
• Large Output Current VCOM Driver
(ISC = 300 mA)
• Stable (1%) Internal 1.295V Reference, to
Improve Picture Quality and Reduce Variations
• 48-pin TSSOP Package

APPLICATIONS
• TFT Gamma Curve Connection and V COM Voltage Buffering

DESCRIPTION
The LM8207 is a combination of 18-channel gamma
buffers, a VCOM driver and a temperature
compensated internal voltage reference. It is
designed for buffering voltage levels and driving high
capacitive loads in large TFT panels. The gamma
buffers are individually optimized to the input/output
requirements of their respective gamma position to
cover the whole voltage range from rail to rail. Any
desired gamma correction curve can be obtained by
combining the gamma buffers with external resistors.
The VCOM driver has a high output current capability
and is stable with large capacitive loads, typical for
large panel sizes. This will result in a fast recovery
time for large voltage variations at the output. The
internal band gap reference can be used to form a
highly stable voltage to generate the gamma
correction voltages. In combination with the internal
amplifier, the reference voltage can be programmed
to voltages up to the positive rail. The LM8207 is
offered in a 48-pin TSSOP package.