BUF20820 Datasheet | Burr-Brown

FEATURES D 18-CHANNEL GAMMA CORRECTION D 2-CHANNEL PROGRAMMABLE V: 100m A IOUT APPLICATIONS D REPLACES RESISTOR-BASED GAMMA SOLUTIONS TFT-LCD REFERENCE DRIVERS DYNAMIC GAMMA CONTROL D D D D D D D ON-CHIP OTP MEMORY 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 4k V HBM, 1k V CDM, 200V MM DESCRIPTION The BUF20820 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 V adjustment, each with 10-bit resolution. It offers on-chip One-Time Programmable (OTP) memory that allows the user to store the gamma voltages on-chip. This eliminates the need for an external EEPROM. 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 voltage changes can also be easily implemented without hardware changes. The BUF20820 uses TI’s latest, small-geometry analog CMOS process, which makes it a very petitive choice for full production, not just evaluation. Programming of each output occurs through an industrystandard, two-wire serial interface. Unlike existing programmable buffers, the BUF20820 offers a high-speed mode that allows clock speeds up to 3.4MHz. For lower or higher channel count, please contact your local sales or marketing representative. OUT 17 OUT 18 D HIGH ESD RATING: D DEMO BOARD AND SOFTWARE AVAILABLE .. 2V- 5.5V Digital BUF20820 7V- 18V Analog REFH REFH OUT OUT 1 OUT 2 … … DAC Registers 1 Program mand OTP Memory DAC Registers 2 … 18 Output Channels plus Two V Channels The BUF20820 is available in an HTSSOP-38 Power PAD package. It is specified from - 40°C to +85°C. BUF20820 RELATED PRODUCTS V OUT1 FEATURES 18-Channel...