BU F22
821 BUF22821
SBOS399D – JUNE 2007 – REVISED JULY 2011 www.ti.com Programmable Gamma-Voltage Generator and
VCOM Calibrator with Integrated Two-Bank Memory
Check for Samples: BUF22821 FEATURES DESCRIPTION 24-CHANNEL GAMMA
– 22-CHANNEL PROGRAMMABLE
– 2-CHANNEL STATIC GAMMA 2-CHANNEL PROGRAMMABLE VCOM 10-BIT RESOLUTION 16x REWRITABLE NONVOLATILE MEMORY TWO INDEPENDENT MEMORY BANKS RAIL-TO-RAIL OUTPUT LOW SUPPLY CURRENT: 0.5mA/channel SUPPLY VOLTAGE: 9V to 20V DIGITAL SUPPLY: 2V to 5.5V I2C™ INTERFACE 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. 1 234 APPLICATIONS TFT-LCD REFERENCE DRIVERS
Digital
(2.0V to 5.5V) BKSEL Analog
(9V to 20V) 1
STATOUTH
STATINH
AVDD
OUT1 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 …
