BUF22821 Datasheet | Texas Instruments

FEATURES - 234 24-CHANNEL GAMMA - 22-CHANNEL PROGRAMMABLE - 2-CHANNEL STATIC GAMMA - 2-CHANNEL PROGRAMMABLE V - 10-BIT RESOLUTION - 16x REWRITABLE NONVOLATILE MEMORY - TWO INDEPENDENT MEMORY BANKS - RAIL-TO-RAIL OUTPUT - LOW SUPPLY CURRENT: 0.5m A/channel - SUPPLY VOLTAGE: 9V to 20V - DIGITAL SUPPLY: 2V to 5.5V - I2C™ INTERFACE APPLICATIONS - TFT-LCD REFERENCE DRIVERS BKSEL Digital Analog (2.0V to 5.5V) (9V to 20V) 1 STATOUTH STATINH AVDD OUT1 DESCRIPTION The BUF22821 offers 22 programmable gamma channels, two programmable V 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 V 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 V channels offer a rail-to-rail output that typically swings to within 100m V of either supply rail with a 10m A load. All channels are programmed using an I2C interface that supports standard operations up to 400k Hz 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 Power PAD™ package. It is specified from - 40°C to +85°C. 16x Nonvolatile Memory BANK0 16x Nonvolatile Memory BANK1 ¼ DAC Registers ¼ DAC Registers ¼ ¼ ¼ OUT2 OUT21 OUT22 STATINL STATOUTL...