BUF12800

Features:

 12-CHANNEL GAMMA CORRECTION
 10-BIT RESOLUTION
 DOUBLE-BUFFERED DAC REGISTERS
 INTEGRATED REFERENCE BUFFERS
 RAIL-TO-RAIL OUTPUT
 LOW SUPPLY CURRENT: 900A/ch
 SUPPLY VOLTAGE: 7V to 18V
 DIGITAL SUPPLY: 2.7V to 5.5V
 INDUSTRY-STANDARD TWO-WIRE INTERFACE
− High-Speed Mode: 3.4MHz
 HIGH ESD RATING:
− 4kV HBM, 1kV CDM, 200V MM
 DEMOBOARD AND SOFTWARE AVAILABLE


Application

 TFT-LCD REFERENCE DRIVERS
 REFERENCE VOLTAGE GENERATORS
 INDUSTRIAL PROCESS CONTROL


Pinout




Specifications

Supply Voltage, V_S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V
Supply Voltage, V_SD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
Signal Input Terminals, SCL, SDA, AO, LD:
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5V to +6V
Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA
Output Short-Circuit⁽²⁾. . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Operating Temperature. . . . . . . . . . . . . . . . . . . . −40°C to +95°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
Lead Temperature (soldering, 10s). . . . . . . . . . . . . . . . . . +300°C
ESD Rating:
Human Body Model (HBM)...... . . . . . . . . . . . . . . . . . . . . . . . 4000V
Charged Device Model (CDM) ........ . . . . . . . . . . . . . . . . . . . 1000V
Machine Model (MM) .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200V

(1) Stresses above these ratings may cause permanent damage.Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not Supported.

(2) Short-circuit to ground, one amplifier per package.This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

Description

The BUF12800 is a programmable voltage reference generator designed for dynamic gamma correction in TFT-LCD panels. It provides 12 programmable outputs, each with 10-bit resolution.

TI's new, small geometry, state-of-the-art, analog CMOS process BUF12800 allows the use of one digital-to-analog converter (DAC) per channel while still maintaining a very small chip size. This topology has the advantage of significantly increased programming speed over existing programmable buffers.

Programming of each output occurs through an industrystandard, two-wire serial interface. Unlike existing programmable buffers, the BUF12800 offers a highspeed, two-wire interface mode that allows clock speeds up to 3.4MHz. The BUF12800 features a double-buffered DAC register structure that significantly simplifies implementation of dynamic gamma control. This further reduces programming time, especially when many channels have to be updated simultaneously.

Reference pins set the high and low voltages of the output range. They are internally buffered, which simplifies design. They may be connected to external resistors to divide the output range for finer resolution of outputs.

The BUF12800 is available in a TSSOP-24 PowerPAD^TM package. It is specified from −40°C to +85°C.