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12-Channel Programmable Gamma Reference System

12-Channel Programmable Gamma Reference System with SPI Interface

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 12 Programmable Reference Voltages with 10-Bit Resolution
  • Controlled Ramp-Up of Reference Voltages
  • Adjustable LDO
  • Current-Sense Comparator
  • 10V to 18V Analog Supply Range
  • 2.3V to 3.6V Digital Supply Range
  • SPI Interface

Applications/Uses

  • TFT-LCD Panels

Description

The MAX9697 12-channel programmable gamma reference system provides 12 programmable reference voltages with 10-bit resolution. These voltages can be used for gamma correction in TFT-LCD displays, as a VCOM reference, or as sources for level shifter inputs. Each reference voltage features a 10-bit digital-to-analog converter (DAC) and buffer with high peak current to reduce the recovery time of the output voltages when critical levels and patterns are displayed.

An adjustable, low-dropout linear regulator (LDO) further improves the stability and accuracy of the DAC outputs by creating the DAC reference. The MAX9697's integrated gate-driver output controls an external p-channel FET to slowly turn on the linear regulator so that the reference voltages ramp up in a controlled manner.

The MAX9697 has a serial peripheral interface (SPI™) bus for programming the reference voltages. The device also has a current-sense comparator to detect an abnormally high supply current in other areas of the application circuit.

The MAX9697 is available in a 28-pin TQFN package and is specified for operation over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX9697: Functional Diagram MAX9697: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.