AD8381AST Analog Devices, AD8381AST Datasheet

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AD8381AST

Manufacturer Part Number
AD8381AST
Description
Fast, High Voltage Drive, 6-Channel Output DecDriverTM Decimating LCD Panel Driver
Manufacturer
Analog Devices
Datasheet
a
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
REV. 0
PRODUCT DESCRIPTION
The 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. STBY
pin reduces power to a minimum, with fast recovery.
The AD8381 is offered in a 48-lead 7 × 7 × 1.4 mm LQFP
package and operates over the commercial temperature range of
0°C to 85°C.
DecDriver is a trademark of Analog Devices, Inc.
FEATURES
High Voltage Drive:
Output Overload Protection
High Update Rates:
Low Power Dissipation: 570 mW
Voltage Controlled Video Reference (Brightness) and
3.3 V or 5 V Logic and 9 V–18 V Analog Supplies
High Accuracy:
Flexible Logic:
Drives Capacitive Loads:
Available in 48-Lead LQFP
APPLICATIONS
LCD Analog Column Driver
Rated Settling Time to within 1.3 V of Supply Rails
Fast, 100 Ms/s 10-Bit Input Word Rate
Includes STBY Function
Full-Scale (Contrast) Output Levels
Laser Trimming Eliminates External Calibration
INV Reverses Polarity of Video Signal
STSQ/XFR for Parallel AD8381 Operation in
12-Channel Systems
27 ns Settling Time to 1% into 150 pF Load
Slew Rate 265 V/ s with 150 pF Load
Fast, High Voltage Drive, 6-Channel Output
DecDriver
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
DB (0:9)
TM
STBY
STSQ
BYP
CLK
XFR
E/O
L/R
Decimating LCD Panel Driver
VREFHI
AD8381
SEQUENCE
CONTROL
FUNCTIONAL BLOCK DIAGRAM
BIAS
10
VREFLO
10
10
10
10
10
10
CONTROL
SCALING
2-STAGE
2-STAGE
2-STAGE
2-STAGE
2-STAGE
2-STAGE
LATCH
LATCH
LATCH
LATCH
LATCH
LATCH
10
10
10
10
10
10
© Analog Devices, Inc., 2002
DAC
DAC
DAC
DAC
DAC
DAC
INV
AD8381
VMID
www.analog.com
VID0
VID1
VID2
VID3
VID4
VID5

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AD8381AST Summary of contents

Page 1

... DecDriver is a trademark of Analog Devices, Inc. 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices ...

Page 2

AD8381–SPECIFICATIONS Model 1 VIDEO DC PERFORMANCE VDE VCME REFERENCE INPUTS 2 VMID Range VMID Bias Current VREFHI VREFLO VREFHI Input Resistance VREFLO Bias Current VREFHI Input Current 3 VFS Range RESOLUTION Coding DIGITAL INPUT CHARACTERISTICS Input Data Update Rate CLK ...

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TIMING CHARACTERISTICS Parameter t CLK to Data Setup Time 1 t CLK to Data Hold Time 2 t CLK to STSQ Setup Time 3 t CLK to STSQ Hold Time 4 t CLK to XFR Setup Time 5 t CLK ...

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... JMAX 3.5 3.0 2.5 2.0 1.5 1.0 0 AMBIENT TEMPERATURE – C Figure 4. Maximum Power Dissipation vs. Temperature ORDERING GUIDE Temperature Model Range AD8381AST 0°C to 85°C AD8381AST-REEL WARNING! –4– – T )/θ Package Package Description Option 48-Lead LQFP ST-48 Reel ESD SENSITIVE DEVICE REV. 0 ...

Page 5

Pin No. Mnemonic Function 1, 12, 19, 23 Connect 24, 43–45 2–11 DB (0:9) Data Input 13 E/O Even/Odd Select 14 R/L Right/Left Select 15 INV Invert 16 DGND Digital Supply Return 17 DVCC Digital Power Supply 18, ...

Page 6

Performance Characteristics AD8381 12V 2V TPC 1. Invert Switching 10 V Step Response (Rise TPC 2. Data Switching 5 V Step Response (Rise INV = L 12V 7V TPC 3. Data Switching 5 ...

Page 7

TPC 7. Output Settling Time (Rising Edge STEP, INV = LOW 0.00% 12V –0.25% –0.50% –0.75% –1.00 TPC 8. Output Settling Time (Rising ...

Page 8

AD8381 0.5 0.4 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 0 256 512 INPUT CODE TPC 13. Differential Nonlinearity (DNL) vs. Code, INV = H 0.5 0.4 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 0 256 ...

Page 9

INPUT CODE TPC 19. Differential Error Voltage (VDE) vs. Code 7.5 5.0 2.5 CODE 512 0.0 –2.5 –5.0 –7 TEMPERATURE – C TPC 20. Differential Error ...

Page 10

AD8381 FUNCTIONAL DESCRIPTION The AD8381 is a system building block designed to directly drive the columns of LCD panels of the type popularized for use in data projectors. It comprises six channels of precision 10-bit digital-to-analog converters loaded from a ...

Page 11

TRANSFER FUNCTION The AD8381 has two regions of operation, selected by the INV input, where the video output voltages are either above or below a reference voltage, applied externally at the VMID input. The transfer function defines the analog output ...

Page 12

AD8381 Operating Modes—Six-Channel Systems The simplest full color LCD-based system is characterized by an image processor with a single 10-bit-wide data bus and a 6-channel LCD per color. Such systems usually have VGA or SVGA resolution and require a single ...

Page 13

IMAGE PROCESSOR PIXEL CLK +2 STSQ2 STSQ1 CLK 6 COUNTER CLK H. REVERSE CLK 6 COUNTER CLK HSTART HSYNC INV1 INV2 VSYNC REFERENCES VREFHI VCOM Figure 9. Single Data Bus 12-Channel Even/Odd System Block Diagram IMAGE PROCESSOR D(0:9) ODD D(0:9) ...

Page 14

AD8381 LAYOUT CONSIDERATIONS The AD8381 is a mixed-signal, high speed, very accurate device. In order to realize its specifications essential to use a properly designed printed circuit board. Layout and Grounding The analog outputs and the digital inputs ...

Page 15

GAGE PLANE 0.25 (0.0098) REV. 0 OUTLINE DIMENSIONS Dimensions shown in millimeters and (inches) 48-Lead LQFP (ST-48) 1.60 (0.0630) 0.063 (1.60) 0.354 (9.00) MAX MAX BSC SQ 0.030 (0.75) PIN 1 0.024 (0.60 INDICATOR 9.00 (0.3543) 37 0.018 ...

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