ADD8701 - Analog Devices

ADD8701 12-Channel Gamma Buffers with VCOM Buffer

9 10 11 12 13 14 15 16 V7 VDD V12 TIMING AND CONTROL GAMMA REFERENCE VOLTAGES PANEL TIMING CONTROLLER SCAN DRIVER CONTROL SOURCE DRIVER NO. 1 384 SOURCE DRIVER NO. 2 384 SOURCE DRIVER NO. 8 384 ADD8701 RESISTOR LADDER R G B SCAN DRIVERS 768 TFT COLOR PANEL 1024 ؋ 768 VCOM OUT V1 GND VCOM IN VDD Figure 1. Typical SVGA TFT-LCD Application.

Features

Single-Supply Operation: 7 V to 16 V Dual-Supply Operation: ؎ 3.5 V to ؎8 V Supply Current: 13 mA Max Upper/Lower Buffers Swing to VDD/GND Continuous Output Current: 10 mA VCOM Peak Output Current: 250 mA Offset Voltage: 15 mV Max Slew Rate: 6 V/␮s Fast Settling Time with Large C-Load APPLICATIONS TFT LCD Panels FUNCTIONAL BLOCK DIAGRAM VCOM OUT GND V12 V11 V10 V9 V8 26 32 31 30 26 28 27 25 24 GND 23 VDD 22 V6 21 V5 20 V4 19 V3 18 V2 17 V1 VDD VCOM IN IN12 IN11 IN10 IN9 IN8 IN7 1 2 3 4 5 6 7 8 The ADD8701 is a low cost, 12-channel buffer amplifier and VCOM driver that operates.