10-Bit, 12-Channel Decimating

AD8385

Rev. 0

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FEATURES

High voltage drive to within 1.3 V of supply rails

Output short-circuit protection

High update rates

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

Static power dissipation: 1.84 W

Voltage controlled video reference (brightness), offset,

and full-scale (contrast) output levels

INV bit reverses polarity of video signal

3.3 V logic, 9 V to 18 V analog supplies

Level shifters for panel timing signals

High accuracy voltage outputs

Laser trimming eliminates the need for adjustments or

calibration

Flexible logic

STSQ/XFR allow parallel AD8385 operation

Fast settling into capacitive loads

30 ns settling time to 0.25% into 150 pF load

Slew rate 460 V/µs

Available in 100-lead 14 mm × 14 mm TQFP E-pad

GENERAL DESCRIPTION

The AD8385 provides a fast, 10-bit, latched decimating digital

input that drives 12 high voltage outputs. 10-bit input words are

loaded into 12 separate high speed, bipolar DACs sequentially.

Flexible digital input format allows several AD8385s 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, 8-bit DACs are integrated to

provide dc reference signals. A 3-wire serial interface controls

overload protection, output mode, and the serial DACs.

The AD8385 is fabricated on ADI’s fast bipolar, 26 V XFHV

process, which provides fast input logic, bipolar DACs with

trimmed accuracy and fast settling, high voltage, precision drive

amplifiers on the same chip.

The AD8385 dissipates 1.84 W nominal static power.

The AD8385 is offered in a 100-lead, 14 mm × 14 mm TQFP

E-pad package and operates over the commercial temperature

range of 0°C to 85°C.

FUNCTIONAL BLOCK DIAGRAM

BYP

DYIN

DIRYIN

DIRXIN

NRGIN

DXIN

ENBX1I

ENBX2I

ENBX3I

ENBX4I

CLXIN

CLYIN

MONITI

SVRH

SVRL

SVRL

SDI

SCL

SEN

VRH

VRH

VRL

R/L

CLK

STSQ

XFR

DB(0:9)

INV

V1

V2

TSTM

CLX

CLY

CLXN

CLYN

MONITO

AD8385

VAO1

VAO2

VID0

VID1

VID2

VID3

VID4

VID5

VID6

VID7

VID8

VID9

VID10

VID11

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.