The BUF20800 is a programmable voltage reference generator designed for gamma correction in TFT-LCD panels. It provides 18 programmable outputs for gamma correction and two channels for VCOM adjustment, each with 10-bit resolution.
This programmability replaces the traditional, timeconsuming process of changing resistor values to optimize the various gamma voltages and allows designers to determine the correct gamma voltages for a panel very quickly. Required changes can also be easily implemented without hardware changes.
The BUF20800 uses TI’s latest, small-geometry analog CMOS process, which makes it a very competitive choice for full production, not just evaluation.
Programming of each output occurs through an industry-standard, two-wire serial interface. Unlike existing programmable buffers, the BUF20800 offers a high-speed mode that allows clock speeds up to 3.4MHz.
For lower channel count, please contact your local sales or marketing representative.
The BUF20800 is available in an HTSSOP-38 PowerPAD™ package. It is specified from –40°C to +85°C.
PowerPAD is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
| Display type | LCD unipolar |
| IC integration | Gamma buffer, VCOM |
| Vin (min) (V) | 7 |
| Vin (max) (V) | 18 |
| Applications | 13 to 21 inches, 21 inches and above, 7 inches or less, 7 to 13 inches |
| Source driver voltage (min) (V) | 7 |
| Source driver voltage (max) (V) | 18 |
| Level shifter/scan driver (Ch) | 0 |
| Features | Gamma buffer, I2C interface, VCOM or op amp |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 95 |
| HTSSOP (DCP) | 38 | 62.08 mm² 9.7 x 6.4 |
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