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Status

Active: In Production.

Description

Request Full Data Sheet The MAX9668 outputs eight voltage references for gamma correction in TFT LCDs and one voltage reference for VCOM. Each gamma reference voltage has its own 10-bit digital-to-analog converter (DAC) and buffer to ensure a stable voltage. The VCOM reference voltage has its own 10-bit DAC and an amplifier to ensure a stable voltage when critical levels and patterns are displayed. The MAX9668 features integrated multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating the need for external EEPROM. The MAX9668 supports up to 100 write operations to the on-chip nonvolatile memory. The gamma outputs can drive 200mA peak transient current and settle within 1µs. The VCOM output can provide 600mA peak transient current and also settles within 1µs. The analog supply voltage range extends from 9V to 20V, and the digital supply voltage range extends from 2.7V to 3.6V. Gamma values and the VCOM value are programmed into registers through the I²C interface.

Key Features		Applications/Uses
8-Channel Gamma Correction 10-Bit Resolution VCOM Driver Integrated MTP Memory Programmable VCOM Limits 1µs Settling Time 20V Maximum Analog Supply Voltage 200mA Peak Current on Gamma Channels 600mA Peak Current on VCOM Channel		TFT LCDs

Key Specifications:  Programmable Gamma Buffers

Part Number

Total Channels

Programmable Channels

Resolution (bits)

Integrated Nonvolatile Memory

Memory Banks

VCOM Calibrator

VCOM Buffer

Interface

VSUPPLY (V)

IQ (mA)

Package/Pins

Smallest Available Pckg. (mm2)

Oper. Temp. (°C)

Price

max w/pins

See Notes

MAX9668

8

8

10

Yes

1

Yes

Yes

I2C

9 to 20

21

TQFN/20

26

-40 to +125

$1.30 @1k

See All Programmable Gamma Buffers (14)

Diagram

Functional Diagram

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Document Ref.: 19-4501; Rev 2; 2009-10-07
This page last modified: 2009-10-07