12 + 1 Gamma/V Reference with Regulator

The ADD8707 is a 12-channel, integrated gamma reference with VCOM for use in high resolution TFT LCD monitor and TV panels. The output buffers feature low offset voltage and high current drive under transient load conditions to provide an accurate and stable gamma curve. Two channels swing to VDD and two channels swing to GND, increasing the overall range of the curve. A novel approach is used to reduce the external component count while increasing accuracy by integrating the gamma setup resistors. To accommodate multiple column drivers and panel architectures, the internal resistor string is mask-programmable, and the tap points are externally accessible. An on-board voltage regulator minimizes supply ripple to provide a fixed point for the resistor string. Here again, external component costs are reduced and the quality of the gray scale is increased.

The ADD8707 is specified over the temperature range of –40°C to +100°C and comes in a robust, low cost, lead frame chip scale package.

* Integrated Voltage Regulator * Mask Programmable Gamma Resistors: 0.2% Resolution * Upper/lower Buffers Swing to VDD/GND * Single-supply Operation: 7.5 V to 16 V