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Analog Devices - LCD DecDriver

Numéro de référence AD8387
Description LCD DecDriver
Fabricant Analog Devices 
Logo Analog Devices 





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AD8387 fiche technique
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High Performance, 12-Bit, 12-Channel
Decimating, LCD DecDriver®
AD8387
FEATURES
High accuracy, high-resolution voltage outputs
1 mV channel matching
12-bit input resolution
Laser-trimmed outputs
Fast settling, high voltage drive
35 ns settling time to 0.25% into 150 pF load
Slew rate 420 V/μs
Outputs to within 1.3 V of supply rails
High update rates
Fast, 110 MHz clock
Programmable video reference (brightness) and
full-scale (contrast) output levels
Flexible logic
INV bit reverses polarity of video signal
R/L reverses loading order of data
ISW selects frame/row or column/dot inversion
DSW selects single or dual data bus mode
Output short-circuit protection
3.3 V logic, 11 V to 18 V analog supplies
Available in 80-lead, 12 mm × 12 mm, TQFP E-pad
APPLICATIONS
LCD microdisplay driver
GENERAL DESCRIPTION
The AD8387 DecDriver provides dual, fast latched, 12-bit
decimating input, which drives 12 high voltage outputs. Twelve-
bit input words are loaded into 12 separate high speed, bipolar
DACs sequentially. Flexible digital input format allows more
than one AD8387 to be used in parallel for higher resolution
displays. The output signal can be adjusted for dc reference,
signal inversion, and contrast for maximum flexibility.
The AD8387 is fabricated on ADI’s fast bipolar, 26 V XFCB
process, providing fast input logic, bipolar DACs with trimmed
accuracy and fast settling, high voltage, precision drive
amplifiers on the same chip.
The AD8387 dissipates 1.34 W nominal static power. The
AD8387 is offered in an 80-lead TQFP E-pad package and
operates over the commercial temperature range of 0°C to
+85°C.
FUNCTIONAL BLOCK DIAGRAM
DBA(0:11)
DBB(0:11)
12
12
12 TWO-STAGE 12
LATCH
DAC
12
TWO-STAGE 12
LATCH
DAC
BYP
TSW
GSW
DSW
CLK
XFR
R/L
BIAS
THERMAL
SWITCH
G-MODE
SWITCH
12 TWO-STAGE 12
LATCH
DAC
12
TWO-STAGE 12
LATCH
DAC
SEQUENCE
CONTROL
INV ISW
AD8387
Figure 1.
SCALING
CONTROL
VRH VRL
VID0
VID1
VID10
VID11
5
4
3
CODE 0
2
1 CODE 4095
NORMAL PROJECTOR OPERATING
TEMPERATURE RANGE
CODE 2048
0
0 10 20 30 40 50 60 70
INTERNAL AMBIENT TEMPERATURE (°C)
Figure 2. Channel Matching vs. Temperature
80
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.

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