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AD8381JST
Fast, 6-Channel Output DecDriver™ Decimating LCD Panel Driver
REV.B
Fast, High Voltage Drive, 6-Channel Output
DecDriver® Decimating LCD Panel Driver
FUNCTIONAL BLOCK DIAGRAM
FEATURES
High Voltage Drive:
Rated Settling Time to within 1.3 V of Supply Rails
Output Overload Protection
High Update Rates:
Fast, 100 Ms/s 10-Bit Input Word Rate
Low Power Dissipation: 570 mW
Includes STBY Function
Voltage Controlled Video Reference (Brightness) and
Full-Scale (Contrast) Output Levels
3.3 V or 5 V Logic and 9 V to 18 V Analog Supplies
High Accuracy:
Laser Trimming Eliminates External Calibration
Flexible Logic:
INV Reverses Polarity of Video Signal
STSQ/XFR for Parallel AD8381 Operation in
12-Channel Systems
Drives Capacitive Loads:
27 ns Settling Time to 1% into 150 pF Load
Slew Rate 265 V/�s with 150 pF Load
Available in 48-Lead LQFP
APPLICATIONS
LCD Analog Column Driver
PRODUCT DESCRIPTIONThe AD8381 provides a fast, 10-bit latched decimating digital
input, which drives six high voltage outputs. Ten-bit input
words are sequentially loaded into six separate high speed, bipolar
DACs. Flexible digital input format allows several AD8381s to be
used in parallel for higher resolution displays. STSQ synchronizes
sequential input loading, XFR controls synchronous output
updating and R/L controls the direction of loading as either
left-to-right or right-to-left. Six channels of high voltage
output drivers drive to within 1.3 V of the rail in rated settling
time. The output signal can be adjusted for brightness, signal
inversion, and contrast for maximum flexibility.
The AD8381 is fabricated on ADI’s proprietary, fast bipolar
24 V process, providing fast input logic, bipolar DACs with
trimmed accuracy and fast settling, high voltage precision drive
amplifiers on the same chip.
The AD8381 dissipates 570 mW nominal static power. The
STBY pin reduces power to a minimum, with fast recovery.
The AD8381 is offered in a 48-lead 7 mm ¥ 7 mm ¥ 1.4 mm
LQFP package and operates over the commercial temperature
range of 0∞C to 85∞C.
AD8381–SPECIFICATIONS
(@ 25�C, AVCC = 15.5 V, DVCC = 3.3 V, VREFLO = VMID = 7 V, VREFHI = 9.5 V,
TMIN = 0�C, TMAX = 85�C, unless otherwise noted.)REFERENCE INPUTS
DIGITAL INPUT CHARACTERISTICS
VIDEO OUTPUT CHARACTERISTICS
VIDEO OUTPUT DYNAMIC PERFORMANCE
NOTESVDE = Differential error voltage. VCME = Common-mode error voltage. See the Theory of Operation section.
AD8381
TIMING CHARACTERISTICSFigure 1.Timing Requirement E/O = High
Figure 2.Timing Requirements E/O = Low
Figure 3.Output Timing
AD8381
ABSOLUTE MAXIMUM RATINGS1Supply Voltages
AVCCx – AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 V
DVCC – DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Input Voltages
Maximum Digital Input Voltages . . . . . . . . DVCC + 0.5 V
Minimum Digital Input Voltages . . . . . . . . DGND – 0.5 V
Maximum Analog Input Voltages . . . . . . . . . AVCC + 0.5 V
Minimum Analog Input Voltages . . . . . . . . AGND – 0.5 V
Internal Power Dissipation2
LQFP Package @ 25∞C Ambient . . . . . . . . . . . . . . . . 2.7 W
Output Short Circuit Duration . . . . . . . . . . . . . . . . . . Infinite
Operating Temperature Range . . . . . . . . . . . . . . 0∞C to 85∞C
Storage Temperature Range . . . . . . . . . . . . –65∞C to +125∞C
Lead Temperature Range (Soldering 10 sec) . . . . . . . . 300∞C
NOTESStresses above those listed under the Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional operation
of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to the absolute
maximum ratings for extended periods may reduce device reliability.48-lead LQFP Package:qJA = 45∞C/W (Still Air, 4-Layer PCB)qJC = 19∞C/W
Overload ProtectionThe AD8381 employs a two-stage overload protection circuit
that consists of an output current limiter and a thermal shutdown.
The maximum current at any one output of the AD8381 is
internally limited to 100 mA average. In the event of a momen-
tary short circuit between a video output and a power supply rail
(VCC or AGND), the output current limit is sufficiently low to
provide temporary protection.
The thermal shutdown debiases the output amplifier when the
junction temperature reaches the internally set trip point. In the
event of an extended short circuit between a video output and a
power supply rail, the output amplifier current continues to
switch between 0 mA and 100 mA typ with a period determined by
the thermal time constant and the hysteresis of the thermal trip
point. The thermal shutdown provides long term protection by
limiting the average junction temperature to a safe level.
Recovery from a momentary short circuit is fast, approximately
100 ns. Recovery from a thermal shutdown is slow and is
dependent on the ambient temperature.
MAXIMUM POWER DISSIPATIONThe maximum power that can be safely dissipated by the AD8381
is limited by its junction temperature. The maximum safe junc-
tion temperature for plastic encapsulated devices is determined
by the glass transition temperature of the plastic, approximately
150∞C. Exceeding this limit temporarily may cause a shift in the
parametric performance due to a change in the stresses exerted
on the die by the package. Exceeding a junction temperature of
175∞C for an extended period can result in device failure.
To ensure proper operation within the specified operating tem-
perature range, it is necessary to limit the maximum power
dissipation as follows:
PDMAX = (TJMAX – TA)/qJA
where:
TJMAX = 150∞C.
Figure 4.Maximum Power Dissipation vs. Temperature
ORDERING GUIDE
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD8381 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
PIN FUNCTION DESCRIPTIONS18, 27, 31
35, 42
22, 25, 29
33, 37, 41
26, 28, 30,
PIN CONFIGURATION
VID0
AVCC0, 1
VID1
AGND1, 2
VID2
AVCC2, 3
VID3
DB0
DB1
DB2
DB3
DB4
DB5
NC = NO CONNECT
DB6
DB7
DB8
DB9
AGND3, 4
VID4
AVCC4, 5
VID5AGND5
E/OR/LINV
DGND
CCBIAS
STBY
BYP
GNDBIASNC
GND0
VMIDVREFLOVREFHIA
GNDD
DACNCNCSTSQXFRCLK
AD8381TPC 1.Invert Switching 10 V Step Response (Rise) at CL
TPC 2.Data Switching 5 V Step Response (Rise)
at CL, INV = L
TPC 3.Data Switching 5 V Step Response (Rise)
at CL, INV = H
TPC 4.Invert Switching 10 V Step Response (Fall) at CL
TPC 5.Data Switching 5 V Step Response (Fall)
at CL, INV = L
TPC 6.Data Switching 5 V Step Response (Fall)
at CL, INV = H
–Typical Performance Characteristics
TPC 7.Output Settling Time (Rising Edge) at CL,
5 V Step, INV = Low
TPC 8.Output Settling Time (Rising Edge) at CL,
5 V Step, INV = High
TPC 9.All-Hostile Crosstalk at CL
TPC 10.Output Settling Time (Falling Edge) at CL,
5 V Step, INV = Low
TPC 11.Output Settling Time (Falling Edge) at CL,
5 V Step, INV = High
TPC 12.Data Switching Transient (Feedthrough) at CL
AD8381TPC 13.Differential Nonlinearity (DNL) vs. Code, INV = H
TPC 14.Integral Nonlinearity (INL) vs. Code, INV = H
TPC 15.Normalized VDE at Code 0 vs. VMID, AVCC = 15.5 V
TPC 16.Differential Nonlinearity (DNL) vs. Code, INV = L
TPC 17.Integral Nonlinearity (INL) vs. Code, INV = L
TPC 18.AVCC Power Supply Rejection vs. Frequency
