| Display type | LCD unipolar |
| IC integration | Gamma buffer, VCOM |
| Vin (Min) (V) | 7 |
| Vin (Max) (V) | 18 |
| 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 |
- 18-CHANNEL GAMMA CORRECTION
- 2-CHANNEL PROGRAMMABLE VCOM:
100mA IOUT - 10-BIT RESOLUTION
- RAIL-TO-RAIL OUTPUT
- LOW SUPPLY CURRENT: 900μA/ch
- SUPPLY VOLTAGE: 7V to 18V
- DIGITAL SUPPLY: 2.0V to 5.5V
- INDUSTRY-STANDARD, TWO-WIRE INTERFACE:
3.4MHz High-Speed Mode - HIGH ESD RATING:
4kV HBM, 1kV CDM, 200V MM - DEMO BOARD AND SOFTWARE AVAILABLE
- APPLICATIONS
- REPLACES RESISTOR-BASED GAMMA SOLUTIONS
- TFT-LCD REFERENCE DRIVERS
- DYNAMIC GAMMA CONTROL
PowerPAD is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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.
