MAX9590

The MAX9590 provides 14 programmable voltage references and 4 static voltage references for gamma correction in TFT-LCD displays. Two register banks are provided to store two sets of gamma reference values.Gamma values of MAX9590 are programmed into the banks through the I²C* interface and the outputs can switch between values in 0.5s.

The 14 programmable reference voltages of MAX9590 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 DAC and 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 of MAX9590 is able to provide a high current that further ensures a stable voltage when critical levels and patterns are displayed.

The 14 programmable buffers of MAX9590 wake-up in high-impedance tate until the registers are programmed. This protects he LCD system from high transient currents during the tartup phase.

The MAX9590 is available in a 38-pin TQFN package nd is specified for operation over the -40°C to +85°C emperature range.