10-Bit, 6-Channel Decimating

AD8384

Rev. 0

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PRODUCT FEATURES

High accuracy, high resolution voltage outputs

10-bit input resolution

Laser trimmed outputs

Fast settling, high voltage drive

30 ns settling time to 0.25% into a 150 pF load

Slew rate 460 V/µs

Outputs to within 1.3 V of supply rails

High update rates

Fast, 100 Ms/s 10-bit input data update rate

Voltage controlled video reference (brightness), offset, and

full-scale (contrast) output levels

Flexible logic

STSQ/XFR allow parallel AD8384 operation

INV bit reverses polarity of video signal

Output short-circuit protection

3.3 V logic, 9 V to 18 V analog supplies

18 V level shifters for panel timing signals

Available in 80-lead 12 mm × 12 mm TQFP E-pad

APPLICATIONS

LCD analog column drivers

FUNCTIONAL BLOCK DIAGRAM

BYP

DYIN

DIRYIN

DIRXIN

NRGIN

DXIN

ENBX1IN

ENBX2IN

ENBX3IN

ENBX4IN

CLXIN

CLYIN

MONITI

SVRH

SVRL

SDI

SCL

SEN

VRH

VRL

R/L

CLK

STSQ

XFR

DB(0:9)

INV

V1

V2

TSTM

CLX

CLY

CLXN

CLYN

MONITO

AD8384

VAO1

VAO2

VID0

VID1

VID2

VID3

VID4

VID5

DY

DIRY

DIRX

NRG

DX

ENBX1

ENBX2

ENBX3

ENBX4

SCALING

CONTROL

SEQUENCE

CONTROL

BIAS

DACs

2-STAGE

LATCH

INV

CONTROL

12-BIT

SHIFT

REGISTER

DUAL

DAC

S

R

Figure 1.

PRODUCT DESCRIPTION

The AD8384 DecDriver provides a fast, 10-bit, latched,

decimating digital input that drives six high voltage outputs.

10-bit input words are loaded sequentially into six separate high

speed, bipolar DACs. Flexible digital input format allows several

AD8384s to be used in parallel in high resolution displays. The

output signal can be adjusted for dc reference, signal inversion,

and contrast for maximum flexibility. Integrated level shifters

convert timing signals from a 3 V timing controller to high

voltage for LCD panel timing inputs. Two serial input, 8-bit

DACs are integrated to provide dc reference signals. DAC

addresses and 8-bit data are loaded in one 12-bit serial word.

The AD8384 is fabricated on the 26 V, fast, bipolar XFHV

process developed by Analog Devices, Inc. This process

provides fast input logic, bipolar DACs with trimmed accuracy

and fast settling, high voltage, precision drive amplifiers on the

same chip.

The AD8384 dissipates 1.1 W nominal static power.

The AD8384 is offered in an 80-lead 12 mm × 12 mm TQFP

E-pad package and operates over the 0°C to 85°C commercial

temperature range.