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ADD8709ASTZ-REEL Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADD8709ASTZ-REEL
Beschreibung 18-Channel Gamma Buffer with Regulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADD8709ASTZ-REEL Datasheet, Funktion
FEATURES
Integrated voltage regulator
Upper/lower buffers swing to VDD/GND
Single-supply operation: 7.5 V to 16.5 V
Continuous current drive: 15 mA
High peak output current: 150 mA
Low offset voltage: 15 mV max
Output voltage stable under transient load conditions
APPLICATIONS
TFT LCD monitor panels
TFT LCD TV panels
GENERAL DESCRIPTION
The ADD8709 is an 18-channel gamma reference for use in
high-resolution TFT LCD monitor and TV panels. The output
buffers feature low offset voltage and high current drive under
transient load conditions to provide a more accurate and stable
gamma curve. Two channels swing to VDD and two channels
swing to GND, increasing the overall range of the curve. An
on-board voltage regulator is available for external applications.
Here again, external component costs are reduced and the
quality of the gray scale is increased.
The ADD8709 is specified over the temperature range of
–40°C to +100°C and comes in a robust, low profile quad
flat package.
18-Channel Gamma Buffer
with Regulator
ADD8709
FUNCTIONAL BLOCK DIAGRAM
48 47 46 45 44 43 42 41 40 39 38 37
1
2 VREG
3
4
5
6
7
8
9
10
11
12
18 18
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
Figure 1. 48-Lead LQFP
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. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.






ADD8709ASTZ-REEL Datasheet, Funktion
ADD8709
Pin No.
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Mnemonic
VOUT3
VOUT4
VOUT5
VOUT6
GND
VDD
VOUT7
VOUT8
VOUT9
VOUT10
VOUT11
VOUT12
GND
VDD
VOUT13
VOUT14
VOUT15
VOUT16
VOUT17
VOUT18
GND
VDD
Name
Output
Ground
Supply
Output
Ground
Supply
Output
Output
Ground
Supply
Description
Buffer output.
Ground. Nominally 0 V.
Supply voltage. Nominally 16 V.
Buffer output.
Ground. Nominally 0 V.
Supply voltage. Nominally 16 V.
Buffer output.
Buffer output. Designed to have higher source than sink capability.
Ground. Nominally 0 V.
Supply voltage. Nominally 16 V.
Rev. 0 | Page 6 of 16

6 Page









ADD8709ASTZ-REEL pdf, datenblatt
ADD8709
APPLICATION NOTES
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation in the ADD8709 package
is limited by the associated rise in junction temperature (TJ)
on the die. At approximately 150°C, the glass transition temper-
ature, the properties of the plastic change. Even temporarily
exceeding this temperature limit may change the stresses that
the package exerts on the die, permanently shifting the para-
metric performance of the ADD8709. Exceeding a junction
temperature of 175°C for an extended period can result in
changes in the silicon devices, potentially causing failure.
OPERATING TEMPERATURE RANGE
The maximum junction temperature is as follows:
TJ = TAMB MAX + θJA × WMAX
where:
TAMB MAX = maximum ambient temperature specified on the data
sheet.
θJA = junction-to-ambient thermal resistance, in °C/watt.
WMAX = maximum power dissipated in the device, in watts.
For the ADD8709, WMAX can be calculated with the following
equation:
WMAX = VDD × ISYS + VOUT × IOUT + VDO × IO
where:
VDD × ISYS = nominal system power requirements
VOUT × IOUT = amplifier load power dissipation
VDO × IO = regulator load power dissipation
Example 1
The estimated power consumption of the ADD8709 in extreme
cases is as follows:
VDD × ISYS = 15 V × 15 mA
VOUT × IOUT = (8 V × 5 mA/channel) × 18 channels
VDO × IO = 0.6 V × 5 mA
WMAX = (15 V × 15 mA) + (8 V × 5 mA/channel ×
18 channel) + (0.6 V × 5 mA) = 0.948 W
θJA = 74.57°C/W, TAMB MAX = 45°C
TJ = 45°C + (74.57°C/W) × (0.948 W) = 115.7°C
Here, 150°C is the maximum junction temperature that is
guaranteed before the part breaks down, while 125°C is the
maximum process limit. Because TJ is < 150°C and < 125°C,
this example demonstrates a condition where the part should
perform within process limits.
Rev. 0 | Page 12 of 16

12 Page





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