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.