Programmable Gamma-Voltage Generator And Vcom Calibrator With Integrated Two-Bank Memory

The BUF22821 offers 22 programmable gamma channels, two programmable VCOM channels, and two static gamma channels. It is ideal for the new 10-bit source drivers that require 22 gamma channels. The final gamma and VCOM values CAN be stored in the on-chip, nonvolatile memory. To allow for programming errors or liquid crystal Display (LCD) panel rework, the BUF22821 supports up to 16 write operations to the on-chip memory. The BUF22821 has two separate banks of memory, allowing simultaneous storage of two different gamma curves to facilitate switching between gamma curves. All gamma and VCOM channels offer a Rail-to-Rail output that typically swings to within 100mV of either supply rail with a 10mA load. All channels are programmed using an I2C Interface that supports standard operations up to 400kHz and high-speed data transfers up to 3.4MHz. The BUF22821 is manufactured using Texas Instruments proprietary, state-of-the-art, High-Voltage CMOS process. This process offers very dense Logic and high supply voltage operation of up to 20V. The BUF22821 is offered in a HTSSOP-38 PowerPAD?? package. It is specified from -40C to +85C. By Texas Instruments