Simplified Block Diagram
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- 20V (max) Operating Voltage
- 14 Programmable Reference Voltages
- Four Static Reference Voltages
- Independent DACs
- 8-Bit Resolution per Channel
- Two Register Banks for Two Sets of Gamma Values
- Fast Switching Between Gamma Values
- Output Swing within 100mV of Rails
- 400mA Peak Current on Reference Channels and DAC Channels 1, 7, 8, and 14
- 200mA Peak Current on DAC Channels 2–6, 9–13
- Startup Column Driver Protection
- Industrial Reference Voltage Generators
- TFT-LCD Displays
The 14 programmable reference voltages are divided evenly into seven upper and seven lower voltages for the upper and lower gamma curves of LCD column drivers.
Each gamma reference voltage has an 8-bit digital-to-analog converter (DAC) with an isolation buffer associated with it to ensure stable operation. Therefore, the reference voltages remain stable without synchronizing to the LCD horizontal timing. In addition, each buffer is able to provide a high current that further ensures a stable voltage when critical levels and patterns are displayed.
The reference voltages ramp up proportional to AVDD during startup and gamma buffers wake up in high impedance until all of the registers are written. This protects the LCD column drivers from high transient currents and reverse bias conditions.
The MAX9591 is available in a 38-pin TQFN package and is specified for operation over the -40°C to +85°C temperature range.