ADD8708

Obsolete

18 - Channel Gamma Buffer with Regulator

Data Sheet (Rev. 0) Product Selection Table

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Overview

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 V_DD
Lower 9 Buffers Swing to GND

Single-supply Operation: 7.5 V to 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 ADD8708 is an 18-channel integrated gamma reference for use in high resolution LCD TV and monitors panels. The out-put buffers feature high current drive and low offset voltage to provide an accurate and stable gamma curve. The top nine channels swing to V_DD; 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 to a 0.2% resolution using the on-chip 500 resistor string. The tap points are externally accessible for easy testing of alternative gamma curves. 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 of –40°C 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.