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6-Channel, Muxed Input
Line Inversion LCD Gamma Buffer
ADD8506
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: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
PIN CONFIGURATION DIAGRAM
Single-supply operation: 3.3 V to 6.5 V
INA1
1
VCC1
24
INB1
2
OUT1
23
INA2
3
OUT2
22
INB2
4
OUT3
21
INA3
5
VCC2
20
INB3
6
A/B
19
INA4
7
GND
18
INB4
8
GND
17
INA5
9
OUT4
16
INB5
10
OUT5
15
INA6
11
OUT6
14
INB6
12
VCC3
13
05549-003
Rail-to-rail input, rail-to-rail output
High output current: 380 mA
Low supply current: 3.9 mA
Stable with 1 nF loads
Wide temperature range: -40°C to +105°C
24-lead, Pb-free, TSSOP package
APPLICATIONS
LCD line inversion gamma references
Car navigation panels
Personal media player panels
Figure 1.
GENERAL DESCRIPTION
The ADD8506 has 6-channel LCD gamma reference buffers
designed to drive column driver gamma inputs in line
inversion panels. Each buffer channel has an A/B input to
select between two gamma voltage curves. These buffer
channels drive the resistor ladders of LCD column drivers
for gamma correction. The ADD8506 outputs have high
slew rates and output drives that increase the stability of the
reference ladder, resulting in optimal gray scale and visual
performance.
The ADD8506 is specified over the -40°C to +105°C
temperature range. It is available in a 24-lead thin shrink small
outline (TSSOP), surface-mount, Pb-free package.
ADD8506
Rev. 0 | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configuration Diagram ............................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance .......................................................................4
ESD Performance ..........................................................................4
ESD Caution...................................................................................4
Typical Performance Characteristics ..............................................5
Applications........................................................................................6
Outline Dimensions ..........................................................................7
Ordering Guide .............................................................................7
REVISION HISTORY
9/05--Revision 0: Initial Version
ADD8506
Rev. 0 | Page 3 of 8
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
V
CC
= 5 V, T
A
= 25°C, unless otherwise noted. V
IN
denotes buffer input voltage; I
LOAD
denotes load current; R
L
denotes load resistance;
C
L
denotes load capacitance.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
V
OS
0 V V
IN
5 V
20
mV
Input Common-Mode Voltage Range
V
CM
0
5
V
Input Bias Current
I
B
V
IN
= 2.5 V
2
50
nA
Voltage Gain
A
VO
0.985
V/V
OUTPUT CHARACTERISTICS
Output Voltage High
V
OH
I
LOAD
= +20 mA
4.75
V
Output Voltage Low
V
OL
I
LOAD
= -20 mA
0.2
V
Output Resistance
R
OUT
-20 mA I
LOAD
+20 mA; 0.5 V V
IN
4.5 V
0.20
Output Short Circuit Current
I
SC
120
380
mA
POWER SUPPLY
Supply Current
I
SY
V
IN
= 2.5 V
3.9
5.1
mA
Supply Voltage Range
V
CC
3.3
6.5
V
DYNAMIC PERFORMANCE
Slew Rate
SR
C
L
= 15 pF
7.0
V/s
R
L
= 250
6.2
V/s
Settling Time
t
S
C
L
= 200 pF, R
L
= 10 k
2.5
6
s
LOGIC INPUT CHARACTERISTICS
Input Current Low
I
IL
V
IN
= 0.0 V
100
nA
Input Current High
I
IH
V
IN
= 5.0 V
100
nA
Input Voltage Low
V
IL
V
CC
= 5.0 V, -40°C T
A
105°C
0.8
V
Input Voltage Low
V
IL
V
CC
= 3.3 V, -40°C T
A
105°C
0.7
V
Input Voltage High
V
IH
V
CC
= 5.0 V, -40°C T
A
105°C
1.7
V
Input Voltage High
V
IH
V
CC
= 3.3 V, -40°C T
A
105°C
1.4
V
ADD8506
Rev. 0 | Page 4 of 8
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
THERMAL RESISTANCE
Table 3. Thermal Package Characteristics
Supply Voltage
7 V
Model
Package Type
Unit
Input Voltage
GND to V
CC
Storage Temperature Range
-65°C to +150°C
Junction Temperature Range
-65°C to +150°C
Lead Temperature (Soldering, 60 sec)
300°C
Stresses beyond 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
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
JA
1
2
JC
ADD8506WRUZ 24-Lead
Pb-Free
TSSOP 128 45 °C/W
1
JA
is specified for natural convection on a two-layer board.
2
JC
is specified for natural convection on a two-layer board.
ESD PERFORMANCE
Table 4.
Model
HBM
MM
FICDM
1
2
3
ADD8506WRUZ
3.5 kV
200 V
1.0 kV
1
Human body model.
2
Machine model.
3
Field induced charge device model.
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.
ADD8506
Rev. 0 | Page 5 of 8
TYPICAL PERFORMANCE CHARACTERISTICS
5.5
5.0
0
0
SUPPLY VOLTAGE (V)
S
U
P
P
L
Y
CURRE
NT (mA)
7
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1
2
3
4
5
6
V
CM
= 2.5V
T
A
= 25
°
C
05549-004
CH1 2.00V
CH2
2.00V
M400ns
V
CC
= 5V
T
A
= 25
°
C
5V
0V
INPUT
OUTPUT
5V
0V
05549-007
Figure 2. Supply Current vs. Supply Voltage
Figure 5. Transient Response--Rising
1000
1
0
LOAD CURRENT (mA)
OU
TPU
T
VOLTA
GE TO SU
PPLY R
A
IL (
m
V)
100
100
10
1
10
V
CC
= 5V
T
A
= 25
°
C
05549-005
OUTPUT HIGH
OUTPUT LOW
CH1 2.00V
CH2
2.00V
M400ns
V
CC
= 5V
T
A
= 25
°
C
5V
0V
INPUT
OUTPUT
5V
0V
05549-008
Figure 3. Output Voltage to Supply Rail vs. Load Current
Figure 6. Transient Response--Falling
6
8
40
TEMPERATURE (
°
C)
V
OS
(mV
)
4
2
0
2
4
6
0
25
40
80
90
95
100
105
CH6
CH5
CH2
CH3
CH1
CH4
V
CC
= 5V
V
CM
= 2.5V
05549-006
Figure 4. Offset Voltage vs. Temperature
ADD8506
Rev. 0 | Page 6 of 8
APPLICATIONS
The ADD8506 has CMOS buffers with A/B inputs to select
between two different reference voltages set up by an external
resistor ladder. Input bias currents are orders of magnitude less
than competitive parts. This allows the use of a very large
resistor ladder to save supply current.
Power supply pins on the ADD8506 have multiple ground
(GND) and supply (V
CC
) connections. Because of the high peak
currents that these buffers deliver, it is recommended that all
GND and V
CC
pins be connected and suitably bypassed.
Table 5. MUX Function
The buffer outputs are designed to drive resistive or capacitive
loads. Therefore, to attain the best display performance, do not
use resistors in series with these outputs. Outputs have high
slew rates and 6 s settling times. Each output delivers a
minimum of 120 mA, ensuring a fast response to varying loads.
A/B Select
Input
Logic High
INAx
Logic Low
INBx
RB1
RB2
RB3
RB4
RB5
RB6
5V
5V
RB7
RA1
RA2
RA3
RA4
RA5
RA6
RA7
0.1
F
0.1
F
NOTES
1. RAx RESISTORS ARE USED TO SET POSITIVE INVERSION GAMMA VOLTAGES.
2. RBx RESISTORS ARE USED TO SET NEGATIVE INVERSION GAMMA VOLTAGES.
2
23
24
TO COLUMN
DRIVERS
VCOM
(INVERTING SIGNAL)
5V
0.1
F
05549-009
1
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
10
10
14
11
12
13
Figure 7. Typical Application
ADD8506
Rev. 0 | Page 7 of 8
OUTLINE DIMENSIONS
24
13
12
1
6.40 BSC
4.50
4.40
4.30
PIN 1
7.90
7.80
7.70
0.15
0.05
0.30
0.19
0.65
BSC
1.20
MAX
0.20
0.09
0.75
0.60
0.45
8°
0°
SEATING
PLANE
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-153-AD
Figure 8. 24-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-24)
Dimensions shown in millimeters
ORDERING GUIDE
Temperature
Range
Package
Option
Ordering
Quantity
Model
Package Description
ADD8506WRUZ
-40°C to +105°C
24-Lead Thin Shrink Small Outline Package [TSSOP], Tube
RU-24
96
1
ADD8506WRUZ-REEL7
-40°C to +105°C
24-Lead Thin Shrink Small Outline Package [TSSOP], 7" Reel
RU-24
1,000
1
ADD8506WRUZ-REEL
-40°C to +105°C
24-Lead Thin Shrink Small Outline Package [TSSOP], 13" Reel
RU-24
2,500
1
1
Z = Pb-free part.
ADD8506
Rev. 0 | Page 8 of 8
NOTES
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05549-0-9/05(0)
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