ADD8707

Obsolete

12 + 1 Gamma/V_COM Reference with Regulator

Data Sheet (Rev. A) Product Selection Table

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Overview

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

Continuous Gamma Current Drive: 15 mA
High Peak V_COM Output Current: 250 mA
Low Offset Voltage: 15 mV max
Output Voltage Stable under Transient Load Conditions
48-lead Pb-free LFCSP Package

The ADD8707 is a 12-channel, integrated gamma reference with V_COM 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 V_DD 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.