ADD8708 Datasheet | Analog Devices

FEATURES 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: 7.5 V to 16.5 V Gamma current drive: 15 m A per channel Peak output current: 150 m A Output voltage stable under load conditions Pin-to-pin patible with ADD8709 48-lead, Pb-free LQFP and LFCSP FUNCTIONAL BLOCK DIAGRAM MASK-PROGRAMMABLE REGULATOR RESISTORS FB 700Ω- VREG OUT VDD VDD GND + - GAMMA BUFFERS 1.2V 700Ω- VIN18 700Ω- VIN17 700Ω- VIN16 700Ω- VIN15 700Ω- VIN14 VIN13 700Ω- 700Ω- VIN12 700Ω- VIN11 700Ω- VIN10 700Ω- VIN9 700Ω- VIN8 700Ω- VIN7 700Ω- VIN6 700Ω- VIN5 700Ω- VIN4 700Ω- VIN3 700Ω- VIN2 700Ω- VIN1 VOUT18 VOUT17 VOUT16 VOUT15 VOUT14 VOUT13 VOUT12 VOUT11 VOUT10 VOUT9 VOUT8 VOUT7 VOUT6 VOUT5 VOUT4 VOUT3 VOUT2 VOUT1 APPLICATIONS LCD TV panels LCD monitor panels GENERAL DESCRIPTION The ADD8708 is 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 ponent count while increasing the gamma curve accuracy. To acmodate multiple column drivers and panel architectures, the ADD8708 is mask programmable to 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 of - 40°C to +105°C and es in both a 48-lead, Pb-free, lead-frame chip-scale package and a Pb-free, low-profile, quad flat package. - ESD PROTECTION RESISTORS GND GND Figure 1. 48-Lead LQFP or LFCSP Rev. 0 Information furnished by Analog Devices is believed to be accurate and...