ADD8707

Features:

12 precision gamma reference outputs
Mask-programmable gamma resistors:
0.2% resolution and 0.1% accuracy
Mask programmable voltage regulator: 0.4% accuracy
Upper 6 buffers swing to VDD 
Lower 6 buffers swing to GND
Single-supply operation: 7.5 V to 16 V
Gamma current drive: 15 mA per channel
VCOM peak output current: 250 mA
Outputs stable under load conditions
48-lead, Pb-free LFCSP package 
 


Application

LCD TV panels
LCD monitor panels


Pinout




Specifications

Supply Voltage (V_DD)                                                  18 V
Input Voltage                                               −0.5 V to V_DD
Storage Temperature Range                  −65°C to +150°C
Operating Temperature Range¹             −40°C to +105°C
Lead Temperature Range (Soldering 10 sec)           300°C
Junction Temperature                                              150°C
ESD Tolerance (HBM)                                            ±3000 V
ESD Tolerance (MM)                                               ±100 V


Description

The ADD8707 is a 12-channel integrated gamma reference with  VCOM for use in LCD TV and monitor panels. The output  buffers feature high current drive and low offset voltage to  provide an accurate and stable gamma curve. The top six  channels swing to VDD and the lower six 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 ADD8707 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 supply ripple.  The ADD8707 is specified over the temperature range of  40°C to +105°C and comes in a 48-lead, Pb-free, lead frame chip-scale package.