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MAX5679
Digitally Pro g rammable LCD Gamma Reference Generator with Digital Voltage Reference
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Status
Active: In Production.
Description
The MAX5679 digitally programmable LCD gamma reference generator provides 18 buffered
channels for biasing LCD column drivers. The device provides 14 outputs of 8-bit programmable
gamma reference voltage derived from four externally applied reference voltages, and four buffered
outputs of the same externally applied reference voltages. An I²C serial interface programs the 14 upper and lower range gamma
buffer outputs independently.
The MAX5679 features a digitally programmable voltage reference (DVR) with 7-bit adjustable current sink to set the LCD common
backplane (VCOM) voltage. The MAX5679 includes a power-on reset (POR) function that configures all 14 programmable gamma
outputs to predetermined levels upon initial power-up.
The MAX5679 is available in a 5mm x 5mm, 32-pin TQFN package and is specified over the -40°C to +85°C extended temperature
range.
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Key Features Applications/Uses
z7-Bit Adjustable VCOM Calibrator (DVR)
z14 Programmable Gamma Outputs for LCD
{Column Driver ICs
{8-Bit DAC Resolution for Upper and Lower Range Outputs
{Maximum Output Swing of (AVDD - 0.2V) (OUT1–OUT7)
{Minimum Output Swing of (GND + 0.2V) (OUT8–OUT14)
zFour Independent Reference Inputs
zFour Independent Buffered Reference Outputs
z9V to 20V Analog Supply
z2V to 5.5V Digital Supply
z400kHz I²C-Compatible Serial Interface
zPin-Selectable I²C Address Bit Allows Two Slave IDs
zBackward Compatible with the MAX5678
zTFT-LCD Panels for Desktop Monitors
zTFT-LCD Panels for Flat Screen TVs
Key Specifications: Programmable Gamma Buffers
Part
Number Total
Channels Programmable
Channels Resolution
(bits)
Integrated
Nonvolatile
Memory
Memory
Banks VCOM
Calibrator
V
COM
Buffer Interface VSUPPLY
(V) IQ
(mA) Package/Pins Oper. Temp.
(°C)
MAX5679 18 14 8 No 1 Yes No I2C9 to 16.5 12.5 See Data
Sheet/ -40 to +85
See All Programmable Gamma Buffers (14)
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zNext Day Product Se lection Assistance from Applications Engineers
zParametric Search
zApplications Help
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Document Ref.: 19-4058; Rev 1; 2009-09-17
This page last modified: 2009-09-17
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