MAX9679BETG+T

Video Processing Overview

The MAX9679BETG+T is a 12-channel, 10-bit programmable gamma and VCOM reference voltage generator for TFT LCDs. It integrates 12 DACs with high-current buffers to reduce recovery time during critical display patterns. The device features a programmable internal reference (VPREF) setting the full-scale voltage to approximately 20V. It includes multiple-time programmable (MTP) memory to store codes without external EEPROM. Supply voltages include AVDD1 (up to 20V), AVDD2 (up to 20V), AVDD_AMP (up to 20V), and DVDD (2.7V to 3.6V). Operating temperature range is -40°C to +85°C.

Video Processing Feature Summary

• Integrates 12 programmable gamma channels and one VCOM channel with 10-bit resolution.
• Includes multiple-time programmable (MTP) memory to eliminate external EEPROM requirements.
• Features an integrated programmable reference voltage (VPREF) for DACs.
• Supports switching between two independent sets of gamma curves and VCOM codes via BKSEL.

Video Processing Applications

• TFT LCD panels
• Display driver circuits

Video Processing Procurement Notes

Verify the component matches the exact part number MAX9679BETG+T. Confirm the package type is TQFN-EP with 24 pins. Ensure the operating temperature range meets the application requirement of -40°C to +85°C. Check RoHS compliance status as indicated by the '+' suffix. Validate that the supplier provides authentic Analog Devices/Maxim Integrated products.

Video Processing Selection Notes

Select this component when designing TFT LCD drivers requiring integrated gamma and VCOM generation. It is suitable for applications needing high peak current capability for fast voltage recovery. Consider the separate supply rails (AVDD1, AVDD2, AVDD_AMP) for thermal management. Verify I2C interface compatibility with the system controller.

Video Processing Part Context

The MAX9679B belongs to Maxim Integrated's family of programmable reference voltage generators for display applications. It consolidates functions previously handled by discrete components or external EEPROMs. The device simplifies power sequencing and reduces board space by integrating gamma buffers, VCOM amplifiers, and digital-to-analog converters into a single chip.

Video Processing Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

Video Processing FAQ

How does the MAX9679B handle data persistence?

It uses multiple-time programmable (MTP) memory to store gamma and VCOM codes non-volatily, allowing up to 100 programming cycles without external EEPROM.

What is the function of the BKSEL signal?

The BKSEL logic input selects between two independent sets of gamma curves and VCOM codes stored in volatile memory for real-time switching.