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18-Channel Gamma Buffer with Regulator ADD8709
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
48 1 2 3 4 5 VREG 47
FUNCTIONAL BLOCK DIAGRAM
46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 18 7 8 18 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 24
APPLICATIONS
TFT LCD monitor panels TFT LCD TV panels
6
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 -40C to +100C and comes in a robust, low profile quad flat package.
9 10 11 12
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 (c) 2004 Analog Devices, Inc. All rights reserved.
04715-0-001
ADD8709 TABLE OF CONTENTS
Electrical Characteristics ................................................................. 3 Absolute Maximum Ratings............................................................ 4 Pin Configuration and Function Descriptions............................. 5 Typical Applications Circuit............................................................ 7 Typical Performance Characteristics ............................................. 8 Application Notes ........................................................................... 12 Maximum Power Dissipation ................................................... 12 Operating Temperature Range ................................................. 12 Outline Dimensions ....................................................................... 13 Ordering Guide........................................................................... 14
REVISION HISTORY
7/04--Revision 0: Initial Version
Rev. 0 | Page 2 of 16
ADD8709 ELECTRICAL CHARACTERISTICS
7.5 V VDD 16 V, TA @ 25C, unless otherwise noted. Table 1.
Parameter ALL DEVICES POWER SUPPLY Supply Voltage Supply Current VOLTAGE REGULATOR Dropout Voltage Line Regulation Load Regulation Load Current Thermal Regulation GAMMA BUFFERS POWER SUPPLY Power Supply Rejection Ratio INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Voltage Range Input Impedance Input Capacitance OUTPUT CHARACTERISTICS Output Performance (V1, V8, V9, V18) Output Performance (V2 to V7, V10 to V17) DYNAMIC PERFORMANCE Slew Rate Bandwidth Settling Time to 0.1% Phase Margin Symbol Conditions Min Typ Max Unit
VS ISYS
7.5 No load -20C TA +105C IL = 100 A IL = 5 mA VIN = 8.5 V to 16.5 V, VOUT = 8 V IO = 100 A to 10 mA 10.5
16 15 17 150 350 0.20 0.10
V mA mA mV mV %/V %/mA mA %/W
VDO REGLINE REGLOAD IO REGTHERMAL
100 310 0.01 0.02 5 0.005
PSRR VOS VOS/T IB
VDD = 7 V to 17 V, -20C TA +105C
68
90 5 20 0.5 15 1.1 1.5 VDD
dB mV V/C A A V k pF mV mV V/s MHz s Degrees
-20C TA +105C -20C TA +105C 0
ZIN CIN VOUT1 VOUT1 SR BW tS o IL = 20 mA, VDD = 16 V IL = 5 mA, VDD = 16 V RL = 10 k, CL = 200 pF -3 dB, RL = 10 k, CL = 200 pF 1 V, RL = 10 k, CL = 200 pF RL = 10 k, CL = 200 pF 4
400 1 15 5 6 4.5 1.1 55
1
VOUT is the shift from the desired output voltage under the specified current load.
Rev. 0 | Page 3 of 16
ADD8709 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Supply Voltage (VDD) Input Voltage Storage Temperature Range Operating Temperature Range1 Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) ESD Tolerance (HBM) ESD Tolerance (MM) Rating 18 V -0.5 V to VDD -65C to +150C -40C to +100C -65C to +150C 300C 2000 V 150 V
Stresses above those listed under 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 sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 3. Package Characteristics
Package Type LQFP (ST) JA 74.57 Unit C/W
1
See Application Notes section.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product 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.
Rev. 0 | Page 4 of 16
ADD8709 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VOUT18 VOUT17 VOUT16 VOUT15 VOUT14 VOUT13 VOUT12
38 48 47 46 45 44 43 42 41 40 39 37 36
VOUT11
GND
GND
VDD
VDD
REGFB GND VDD REGOUT VIN18 VIN17 VIN16 VIN15 VIN14
1 2 3 4 5 6 7 8 9
VOUT10 VOUT9 VOUT8 VOUT7 VDD GND VOUT6 VOUT5 VOUT4 VOUT3 VOUT2 VOUT1
04715-0-002
PIN 1 IDENTIFIER
35 34 33 32 31
ADD8709
TOP VIEW (Not to Scale)
30 29 28 27 26 25
VIN13 10 VIN12 11 VIN11 12
13 14 15 16 17 18 19 20 21 22 23 24
VIN10
GND
VIN9
VIN8
VIN7
VIN6
VIN5
VIN4
VIN3
VIN2
Figure 2. 48-Lead Low Profile Quad Flat Package (ST-48)
Table 4. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Mnemonic REGFB GND VDD REGOUT VIN18 VIN17 VIN16 VIN15 VIN14 VIN13 VIN12 VIN11 VIN10 VIN9 VIN8 VIN7 VIN6 VIN5 VIN4 VIN3 VIN2 VIN1 GND VDD VOUT1 VOUT2 Name Regulator Feedback Ground Supply Regulator Output Description Compares a percentage of the regulator output to the internal voltage reference. Internal resistors are used to program the desired regulator output voltage. Ground. Nominally 0 V. Supply voltage or source voltage. Nominally 16 V. Provides a regulated output voltage for use as a reference for additional external gamma channels.
Input
Buffer input.
Ground Supply Output
Ground. Nominally 0 V. Supply voltage. Nominally 16 V. Buffer output. Designed to have higher sink than source capability.
Rev. 0 | Page 5 of 16
VIN1
VDD
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 Description Buffer output.
Ground Supply
Ground. Nominally 0 V. Supply voltage. Nominally 16 V.
Output
Buffer output.
Ground Supply Output
Ground. Nominally 0 V. Supply voltage. Nominally 16 V. Buffer output.
Output Ground Supply
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
ADD8709 TYPICAL APPLICATIONS CIRCUIT
VFB VREG
GND
REGFB REGOUT
VDD
REGIN
VOLTAGE REGULATOR
ADD8709
GAMMA BUFFERS VIN18 18 VIN17 17 VIN16 16 VIN15 15 VOUT15 GAMMA 15 VOUT16 GAMMA 16 VOUT17 GAMMA 17 VOUT18 COLUMN DRIVER GAMMA 18
*EXTERNAL RESISTORS TO SET GAMMA VOLTAGES VIN4 4 VIN3 3 VIN2 2 VIN1 1 VOUT1 GAMMA 1
04715-0-004
VOUT4
GAMMA 4
VOUT3
GAMMA 3
VOUT2
GAMMA 2
GND
Figure 3.
Rev. 0 | Page 7 of 16
ADD8709 TYPICAL PERFORMANCE CHARACTERISTICS
12 11
OUTPUT VOLTAGE ERROR (mV)
30 CH1 SOURCE CH1 SINK 25 CH2 SOURCE CH2 SINK
10
SUPPLY CURRENT (mA)
9 8 7 6 5 4 3
04715-0-007
20
15
10
1 0 0 2 4 6 8 10 12 SUPPLY VOLTAGE (V) 14 16 18
0 0.1
1.0 10 LOAD CURRENT (mA)
100
Figure 4. Supply Current vs. Supply Voltage
Figure 7. Output Voltage Error vs. Load Current
11.0
30 CH3 SOURCE CH3 SINK
10.8
OUTPUT VOLTAGE ERROR (mV)
10.9
SUPPLY CURRENT (mA)
25
CH9 SOURCE CH9 SINK
20
10.7
15
10.6
10
04715-0-008
10.4 -20
0
20
40
60
80
100
120
0 0.1
TEMPERATURE (C)
1.0 10 LOAD CURRENT (mA)
100
Figure 5. Supply Current vs. Temperature
Figure 8. Output Voltage Error vs. Load Current
20 15
ISINK = 25mA ISINK = 15mA ISINK = 5mA
OUTPUT VOLTAGE ERROR (mV)
30 CH10 SOURCE CH10 SINK 25 CH16 SOURCE CH16 SINK
OUTPUT VOLTAGE ERROR (mV)
10 5 0 -5 -10 -15 -20 -25 -30 -35 -20 -10 0 10
04715-0-009
20
ILOAD = 0mA
15
10
ISOURCE = 15mA I SOURCE = 5mA 20 30 40 50 60 70 TEMPERATURE (C) 80
90 100 110 120
0 0.1
1.0 10 LOAD CURRENT (mA)
100
Figure 6. Output Voltage Error vs. Temperature
Figure 9. Output Voltage Error vs. Load Current
Rev. 0 | Page 8 of 16
04712-0-037
ISOURCE = 25mA
5
04712-0-036
10.5
5
04712-0-035
2
5
ADD8709
30 CH17 SOURCE CH17 SINK
OUTPUT VOLTAGE ERROR (mV)
80 70
NUMBER OF AMPLIFIERS
04712-0-038
25
CH18 SOURCE CH18 SINK
60 50 40 30 20 10 0 -100 -80
04712-0-016
20
15
10
5
0 0.1
1.0 10 LOAD CURRENT (mA)
100
-60
-40 -20 0 20 40 60 OUTPUT VOLTAGE ERROR (mV)
80
100
Figure 10. Output Voltage Error vs. Load Current
Figure 13. Output Voltage Error/Gamma 10 to 16
80 70
25
20
NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS
04712-0-013
60 50 40 30 20 10 0 -25 -21 -17 -13 -9 -5 -1 3 7 11 15 OUTPUT VOLTAGE ERROR (mV) 19 23
15
10
5
04712-0-015
0 -100
-80
-60
-40 -20 0 20 40 60 OUTPUT VOLTAGE ERROR (mV)
80
100
Figure 11. Output Voltage Error/Gamma 1 and 2
Figure 14. Output Voltage Error/Gamma 17 and 18
120
15 14 13 12
OUTPUT VOLTAGE (V)
100
NUMBER OF AMPLIFIERS
11 10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5
04712-0-017
80
60
ILOAD = 0mA ILOAD = 5mA ILOAD = 10mA
40
0 -50 -42 -34 -26 -18 -10 -2 6 14 22 30 OUTPUT VOLTAGE ERROR (mV) 38 46
04712-0-014
20
6 7 8 9 10 11 12 13 14 15 16 17 INPUT VOLTAGE (V)
Figure 12. Output Voltage Error/Gamma 3 to 9
Figure 15. Dropout Characteristics
Rev. 0 | Page 9 of 16
ADD8709
1000 900 800
DROPOUT VOLTAGE (mV)
14.45 0mA 14.40
REGULATOR OUTPUT (V)
5mA
700 600 500 400 300 200
04712-0-018
14.35
14.30 10mA 14.25
04712-0-021
100 0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 OUTPUT CURRENT (mA)
14.20 -20 -10
0
10
20
30 40 50 60 70 TEMPERATURE (C)
80
90 100 110
Figure 16. Dropout Voltage vs. Output Current
800 750 700 650
DROPOUT VOLTAGE (mV)
Figure 19. Regulator Output vs. Temperature
18
10mA
CLOAD = 1F
OUTPUT VOLTAGE CHANGE (mV)
600
INPUT VOLTAGE (V)
17
400 200
550 500 450 400 350 300 250 200 150 100 50 0 -25 -15 -5 5 15 25 35 45 55 65 TEMPERATURE (C) 75 85
5mA
16
0 -200
15
04712-0-019
-400
0mA
95 105 115
14 TIME (100s/DIV)
Figure 17. Dropout Voltage vs. Temperature
Figure 20. Regulator Line Transient Response
14.5 14.4 -20C 14.3
REGULATOR OUTPUT (V)
CLOAD = 1F 40 20
0C +25C +55C
14.2 14.1 14.0 +85C 13.9 +95C 13.8 13.7 13.6 0 2 4 6 8 10 12 14 LOAD CURRENT (mA) 16
0 -20 -40 0.1
04712-0-020
5
18
20
TIME (100s/DIV)
Figure 18. Regulator Output vs. ILOAD Over Temperature
Figure 21. Regulator Load Transient Response
Rev. 0 | Page 10 of 16
04712-0-023
+105C
OUTPUT VOLTAGE CHANGE (mV)
LOAD CURRENT (mA)
04712-0-022
ADD8709
11 10 9 8
AMPLITUDE (V)
10 10V PULSE 120pF 320pF 520pF 1nF 10nF
GAIN (dB)
GAMMA 10-18 0
2k 10k
7 6 5 4 3 2
1k -10
-20 150
-30
04712-0-012 04712-0-032
1 0 -200 0 200 400
600 800 1000 1200 1400 1600 1800 TIME (ns)
-40 100k
1M
10M FREQUENCY (Hz)
100M
Figure 22. Transient Load Response vs. Capacitive Loading
20 1040pF 10 540pF 340pF 10 100pF 50pF -10
GAIN (dB) GAIN (dB)
Figure 25. Frequency Response vs. Resistive Loading
VDD = 16V VCOM 0 2k 10k
0
-20
1k
-10
-30 150 -20
04712-0-030 04712-0-034
-40
-30 100k
1M
10M FREQUENCY (Hz)
100M
-50 100k
1M
10M FREQUENCY (Hz)
100M
Figure 23. Frequency Response vs. Capacitive Loading
10 GAMMA 1-9 0 2k 10k
Figure 26. Frequency Response vs. Resistive Loading
1k
GAIN (dB)
-10
-20 150
-30
04712-0-033
-40 100k
1M
10M FREQUENCY (Hz)
100M
Figure 24. Frequency Response vs. Resistive Loading
Rev. 0 | Page 11 of 16
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 150C, the glass transition temperature, 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 parametric performance of the ADD8709. Exceeding a junction temperature of 175C for an extended period can result in changes in the silicon devices, potentially causing failure.
Example 1
The estimated power consumption of the ADD8709 in extreme cases is as follows: VDD x ISYS = 15 V x 15 mA VOUT x IOUT = (8 V x 5 mA/channel) x 18 channels VDO x IO = 0.6 V x 5 mA WMAX = (15 V x 15 mA) + (8 V x 5 mA/channel x 18 channel) + (0.6 V x 5 mA) = 0.948 W JA = 74.57C/W, TAMB MAX = 45C TJ = 45C + (74.57C/W) x (0.948 W) = 115.7C Here, 150C is the maximum junction temperature that is guaranteed before the part breaks down, while 125C is the maximum process limit. Because TJ is < 150C and < 125C, this example demonstrates a condition where the part should perform within process limits.
OPERATING TEMPERATURE RANGE
The maximum junction temperature is as follows: TJ = TAMB MAX + JA x WMAX where: TAMB MAX = maximum ambient temperature specified on the data sheet. JA = 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 x ISYS + VOUT x IOUT + VDO x IO where: VDD x ISYS = nominal system power requirements VOUT x IOUT = amplifier load power dissipation VDO x IO = regulator load power dissipation
Rev. 0 | Page 12 of 16
ADD8709 OUTLINE DIMENSIONS
0.75 0.60 0.45
1.60 MAX
48 1
9.00 BSC SQ
37 36
PIN 1
1.45 1.40 1.35
10 6 2
SEATING PLANE
0.20 0.09 7 3.5 0 0.08 MAX COPLANARITY
TOP VIEW
(PINS DOWN)
7.00 BSC SQ
VIEW A
12 13 24 25
0.15 0.05
SEATING PLANE
0.50 BSC
VIEW A
ROTATED 90 CCW
COMPLIANT TO JEDEC STANDARDS MS-026BBC
0.27 0.22 0.17
Figure 27. 48-Lead Low Profile Quad Flat Package (ST-48) Dimensions shown in millimeters
Rev. 0 | Page 13 of 16
ADD8709
ORDERING GUIDE
Model1 ADD8709ASTZ-REEL2 ADD8709ASTZ-REEL72 Temperature Range -40C to +100C -40C to +100C Package Description 48-Lead Low Profile Quad Flat Package 48-Lead Low Profile Quad Flat Package Package Option ST-48 ST-48
1 2
Available in reels only. Z = Pb-free part.
Rev. 0 | Page 14 of 16
ADD8709 NOTES
Rev. 0 | Page 15 of 16
ADD8709 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04715-0-7/04(0)
Rev. 0 | Page 16 of 16

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