AD8385 Datasheet, PDF (1/24 Pages) Analog Devices – 10-Bit, 12-Channel Decimating LCD DECDRIVER with Level Shifters

10-Bit, 12-Channel Decimating
LCD DECDRIVER^® with Level Shifters
AD8385
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
BIAS
VRH
VRH
3_/
VRL
/ ^{DB(0:9) 10}
SCALING
CONTROL
2-STAGE
LATCH
DACs
R/L
CLK
STSQ
4_/
XFR
INV
V1
V2
SEQUENCE
CONTROL
INV
CONTROL
TSTM
SDI
SCL
SEN
3_/
SVRH
SVRL
3_/
SVRL
DYIN
DXIN
DIRYIN
DIRXIN
NRGIN
9_/
ENBX1I
ENBX2I
ENBX3I
ENBX4I
12-BIT
SHIFT
REGISTER
DUAL
DAC
CLXIN
CLYIN
2_/
R
MONITI
S
Figure 1.
VID0
VID1
/12 VID2
VID3
VID4
VID5
VID6
VID7
VID8
VID9
VID10
VID11
VAO1
VAO2
DY
DX
DIRY
9_/
DIRX
NRG
ENBX1
ENBX2
ENBX3
ENBX4
2_/
CLX
CLY
2_/
CLXN
CLYN
MONITO
AD8385
Rev. 0
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