ADD8702

Obsolete

12-Channel Gamma Buffers with V_COM Buffer

Data Sheet (Rev. 0) Product Selection Table

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Overview

Programmable 12-Channel Gamma
Reference Generator
Mask Programmable Adjustable V_COM Buffer
Upper/Lower Outputs Swing to V_DD/GND
Continuous Output Current: 10 mA

Supply Current: 15 mA Max
V_COM Peak Output Current: 250 mA
Outputs with Fast Settling Time
for Load Change
Output Pins Are Compatible with ADD8701
Single-Supply Operation: 7 V to 16 V

The ADD8702 is a low cost, mask programmable, 12-channel gamma reference generator, plus an adjustable V_COM driver. This part is designed to provide gamma correction for high resolution TFT LCD panels. The 12 gamma reference levels and V_COM are mask programmable to 0.3% resolution using the on-chip 500 chain resistor string. This reduces component and board costs.

The ADD8702 provides a complete programmed set of gamma voltage references for the LCD source drivers. These references settle quickly to load change. The V_COM output is stable with high capacitive loads and can source or sink 250 mA peak current. The V_COM output level can be adjusted using an external trim-potentiometer or discrete resistors. The output pins are compatible with the ADD8701. This allows for single board design and fast turns for prototyping using the initial ADD8701 board design. The ADD8702 is specified over the temperature range of –40°C to +85°C and comes in the 32-lead lead frame chip scale package (LFCSP) for compact board space.