18 precision gamma reference outputs Mask-programmable gamma resistors: 0.2% resolution and 0.1% accuracy Mask-programmable voltage regulator: 0.4% accuracy Upper 9 buffers swing to VDD Lower 9 buffers swing to GND Single-supply operation: 16.5 V Gamma current drive: 15 mA per channel Peak output current: 150 mA Output voltage stable under load conditions Pin-to-pin compatible with ADD8709 48-lead, Pb-free LQFP and LFCSP

The an 18-channel integrated gamma reference for use in high resolution LCD TV and monitors panels. The output buffers feature high current drive and low offset voltage to provide an accurate and stable gamma curve. The top nine channels swing to VDD; the lower nine channels swing to GND. Integrating the gamma setup resistors drastically reduces the external component count while increasing the gamma curve accuracy. To accommodate multiple column drivers and panel architectures, the ADD8708 is mask programmable a 0.2% resolution using the on-chip 500 resistor string. An on-board voltage regulator provides a fixed input for the resistor string, isolating the gamma curve from the supply ripple. The ADD8708 is specified over the temperature range to +105�C and comes in both a 48-lead, Pb-free, lead-frame chip-scale package and a Pb-free, low-profile, quad flat package.

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Electrical Characteristics................................................................. 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics............................................. 7 Application Notes........................................................................... 10 Tap Point Selection..................................................................... 10 Voltage Regulator....................................................................... 11 Maximum Power Dissipation................................................... 11 Land Pattern................................................................................ 11 Operating Temperature Range................................................. 12 Typical Applications Circuit.......................................................... 14 Tap Point and Regulator Voltage Request Form......................... 15 Outline Dimensions....................................................................... 16 Ordering Guide........................................................................... 16

Parameter GAMMA CURVE CHARACTERISTICS Accuracy Programming Resolution Total Resistor String BUFFER CHARACTERISTICS OUTPUTS Output Voltage Range to Ch10) Output Voltage Range to Ch1) Output vs. Load Ch2, Ch1) Output vs. Load to Ch3) INPUTS Offset Voltage Offset Voltage Drift Input Bias Current Input Voltage Range to Ch10) Input Voltage Range to Ch1) DYNAMIC PERFORMANCE Slew Rate Bandwidth Settling Time to 0.1% Phase Margin Power Supply Rejection Ratio VOLTAGE REGULATOR Programmable Range Initial Regulator Accuracy Dropout Voltage Line Regulation Load Regulation Maximum Load Current Feedback Reference Voltage Feedback Input Bias Current SYSTEM ACCURACY Total Error3, 4 POWER SUPPLY Supply Voltage Supply Current Symbol RACC1 RRES RTOTAL Conditions Min Typ 0.2 15 Max 0.4 Unit % k

Gamma curve accuracy includes resistor matching and buffer errors, but excludes the regulator error. VOUT is the shift from the desired output voltage under the specified current load. Total error is the difference between the designed and actual output voltage divided by the actual regulator output voltage or full-scale voltage. 4 Total error includes regulator error, resistor string error, bias current effects, and buffer offset voltage.