Analog Devices EVAL-ADD8504 User manual

Evaluation Board for 4-, 5-, 6-Channel, Muxed
Input Line Inversion LCD Gamma Buffers
EVAL-ADD8504/ADD8505/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: [phone] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Socket for evaluating ADD8504, ADD8505, or ADD8506
Sockets for implementing gamma resistors
External drive capability
Simulates panel behavior
Sockets for capacitive loads
Sockets for resistive loads
Breadboard area
PACKAGE CONTENTS
Data sheets
ADD8504/ADD8505/ADD8506 data sheet
EVAL-ADD8504/ADD8505/ADD8506 evaluation
board data sheet
CD including
Electronic version of ADD8504/ADD8505/ADD8506 data
sheet
Electronic version of EVAL-ADD8505/ADD8505/ADD8506
evaluation board data sheet
Excel®-based spreadsheet for resistor and power
calculations
Five ADD8504 devices
Five ADD8505 devices
Five ADD8506 devices
GENERAL DESCRIPTION
The ADD8504/ADD8505/ADD8506 evaluation board
simplifies evaluation of the ADD8504/ADD8505/ADD8506
under various conditions. This evaluation kit includes a gamma
voltage calculator, labeled ADD8504-05-06 Gamma Voltage
Calculator.xls, on the ADD8504/ADD8505/ADD8506
evaluation board kit CD to assist in determining required
external components to implement the desired gamma voltages.
This documentation is for the ADD8504/ADD8505/ADD8506
evaluation board only; for specific information regarding the
ADD8504/ADD8505/ADD8506 muxed input line inversion
LCD gamma buffers, please refer to the datasheet.
EVALUATION BOARD
05763-001
Figure 1. ADD8504/ADD8505/ADD8506 Evaluation Board

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
Package Contents.............................................................................. 1
General Description ......................................................................... 1
Evaluation Board .............................................................................. 1
Revision History ............................................................................... 2
Setting Up the Evaluation Board .................................................... 3
Part Placement in Socket............................................................. 3
Factory Settings ............................................................................ 3
Switching ....................................................................................... 4
Gamma Resistor Strings...............................................................4
Output Load Sockets.....................................................................4
Evaluation Board Layout ..................................................................5
Functional Blocks..........................................................................5
Evaluation Board Layers...............................................................6
Evaluation Board Schematic and Components.........................7
Ordering Guide..................................................................................8
ESD Caution...................................................................................8
REVISION HISTORY
2/06—Revision 0: Initial Version

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 3 of 8
SETTING UP THE EVALUATION BOARD
To begin using the ADD8504/ADD8505/ADD8506 evaluation
board:
1. Use existing, or modify, Gamma Resistor RA1 to Gamma
Resistor RA7, and Gamma Resistor RB1 to Gamma
Resistor RB7 in Block 2 (see Figure 4).
2. Install the ADD8504/ADD8505/ADD8506 in the socket in
Block 3, see Figure 4. Read the Part Placement in Socket
section for proper part placement and refer to Figure 4 for
the ADD8504/ADD8505/ADD8506 evaluation board
layout.
3. Connect a +5 V power supply to at least one of the three
pins labeled VCC, and connect ground to at least one of
the three pins labeled GND in Block 5 (see Figure 4).
If the above list is complete, the user can probe the input and
output voltages. To switch between the two gamma resistor
strings, connect a switching signal to Pin A/B or toggle the
hardware switch (SW1) between Position A and Position B
(refer to Figure 4).
PART PLACEMENT IN SOCKET
The ADD8504/ADD8505/ADD8506 have 16, 20, and 24 pins,
respectively. To properly place the part in the socket refer to
Figure 2.
ADD8504
The ADD8504 uses Socket Pin 3 to Socket Pin 10, and Socket
Pin 15 to Socket Pin 22. Only Input/Output 2 through Input/
Output 5 are used on the evaluation board. Power and ground
pins are unaffected. Refer to the ADD8504/ADD8505/ADD8506
data sheet for proper pin designations for the ADD8504.
ADD8505
The ADD8505 uses Socket Pin 1 to Socket Pin 10, and Socket
Pin 15 to Socket Pin 24. Only Input/Output 1 through Input/
Output 5 are used on the evaluation board. Power and ground
pins are unaffected. Refer to the ADD8504/ADD8505/ADD8506
data sheet for proper pin designations for the ADD8505.
ADD8506
The ADD8506 fills the socket and uses all input/output pins of
the evaluation board.
INA1
ADD8505
ADD8504
ADD8504
ADD8506
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
05763-002
ADD8505
ADD8506
Figure 2. Part Placement in Socket
FACTORY SETTINGS
The ADD8504/ADD8505/ADD8506 evaluation board is pre-
configured with one 20 kΩ resistor and thirteen 10 kΩ resistors
filling the two gamma resistor strings, for a total of 14 resistors
labeled RA1 to RA7 and RB1 to RB7 as shown in Figure 4. The
20 kΩ resistor is labeled RA1 and serves to differentiate the two
resistor strings to make the outputs change significantly; output
voltages are listed in Table 1.
The board is shipped with an ADD8506 in the TSSOP socket.
All six output load resistors are jumpered (0 Ω resistors), and all
six output load capacitors are 1 nF.
Table 1. Factory Settings1
OUTPUT PIN GAMMA A GAMMA B
OUT1_L 3.750 V 0.714 V
OUT2_L 3.125 V 1.429 V
OUT3_L 2.500 V 2.143 V
OUT4_L 1.875 V 2.857 V
OUT5_L 1.250 V 3.571 V
OUT6_L 0.625 V 4.286 V
1Ideal voltages may differ slightly (±2%).

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 4 of 8
SWITCHING
The ADD8504/ADD8505/ADD8506 evaluation board can be
switched by driving the A/B pin of Block 1 with a 0 V to 5 V
clock. A 5 V input on the A/B pin selects GAMMA A; a 0 V
input selects GAMMA B. The user can also switch manually
using hardware Switch SW1. Switch Position A selects
GAMMA A (RA1 to RA7), and switch Position B selects
GAMMA B (RB1 to RB7), see Figure 3.
GAMMA RESISTOR STRINGS
The ADD8504/ADD8505/ADD8506 evaluation board includes
two external gamma resistor strings consisting of seven resistors
each to produce the necessary tap point voltages. This board has
been preconfigured (refer to the Factory Settings section for
details) as follows: GAMMA A consists of Resistor RA1 to
Resistor RA7, and GAMMA B consists of Resistor RB1 to
Resistor RB7 (see Figure 3).
The user can change the resistor values to produce the desired
voltages. Included with the ADD8504/ADD8505/ADD8506
evaluation board kit is the gamma voltage calculator that allows
the user to specify the desired voltages and automatically calcu-
late the necessary resistor values. In addition, the calculator
allows the user to specify resistances and calculate voltages. The
gamma voltage calculator expedites the evaluation process. It is
located on the ADD8504/ADD8505/ADD8506 evaluation board
kit CD labeled ADD8504-05-06 Gamma Voltage Calculator.xls.
V
CC
RA1 INA1
GAMMA A
(VCOM+)
GAMMA B
(VCOM–)
INA2
INA3
INA4
INA5
INA6
INB1
INB2
INB3
INB4
INB5
INB6
RA2
RA3
RA4
RA5
RA6
RA7
RB1
GND
RB2
RB3
RB4
RB5
RB6
RB7
05763-003
Figure 3. Gamma Resistor String Schematic
OUTPUT LOAD SOCKETS
Sockets are provided on the evaluation board for a series
resistance and capacitive load to ground for each of the six
gamma buffer outputs. The sockets are labeled RLOAD1 to
RLOAD6 and CLOAD1 to CLOAD6; they are located in Block 4
on the evaluation board (see Figure 4). These loads are optional
and are for customer evaluation purposes only. If no load is
desired, neither resistor nor capacitor should be added.
As shipped from the factory, all six output load resistors are
jumpered (0 Ω resistors). All six output load capacitors are 1 nF.

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 5 of 8
EVALUATION BOARD LAYOUT
FUNCTIONAL BLOCKS
05763-004
BLOCK 1
BLOCK 5
BLOCK 2 BLOCK 3 BLOCK 4
BLOCK 6
Figure 4. Evaluation Board Layout
Table 2. Evaluation Board Functional Block Descriptions
Block Block Descriptions
Block 1 Input and Monitoring Pins. Block 1 allows the user to force gamma voltages, drive Gamma Resistor Switch A/B, or monitor input
voltages.
Block 2 Gamma Resistor Strings. Block 2 allows the user to select the resistors to set the desired gamma voltages. Use the gamma voltage
calculator to make these calculations; it can be found on the ADD8504/ADD8505/ADD8506 evaluation board kit CD labeled
ADD8504-05-06 Gamma Voltage Calculator.xls.
Block 3 Part/Socket. This block area accepts a 16-, 20-, or 24-lead TSSOP IC footprint or socket. Read the Part Placement in Socket section
for details (socket part# OTS-24(28)-0.65-01).
Block 4 Load. This block allows the user to set load conditions using resistors and capacitors.
Block 5 Output and Power Pins. Connect power to at least one pin labeled VCC and connect ground to at least one pin labeled GND.
Multiple VCC and GND pins are for convenience only. The other pins are for probing the output voltages. The _L outputs are
loaded outputs.
Block 6 Breadboard Area. This block area is not electrically wired to the evaluation board. It provides an area to place extra components.

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 6 of 8
EVALUATION BOARD LAYERS
05763-005
Figure 5. Evaluation Board Layout—Top Layer
05763-006
Figure 6. Evaluation Board Layout—Bottom Layer
Table 3. Evaluation Board Layer Descriptions
Layer Description
Blue (Top) Top-of-board metal traces and ground plane. See Figure 5.
Red (Bottom) Bottom-of-board metal traces and ground plane. (Note: Top-view shown in Figure 6. Silk screen text is shown for
orientation purposes; text does not appear on bottom of board.)

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 7 of 8
EVALUATION BOARD SCHEMATIC AND COMPONENTS
05763-007
RB1
TBD INA1
OUT1 OUT2 OUT4 OUT5 OUT6 OUT3
OUT1_L OUT2_L OUT4_L OUT5_L OUT6_L OUT3_L
A/B VCC3 VCC2 VCC1
VCC
INB1 INA2 INB2 INA3 INB3 INA4 INB4 INA5 INB5 INA6 INB6
RB2
TBD
RB3
TBD
RB4
TBD
RB5
TBD
RB6
TBD
RB7
TBD
RA1
TBD
VCC2
ADD8506
DGND
DGND
DGND
DGND
RA2
TBD
RA3
TBD
RA4
TBD
RA5
TBD
RA6
TBD
RA7
TBD
C4
0.1µF
C5
0.1µF
2
23 24
1 3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
10 10
14
11
12
13
VCC2
DGND
CLOAD2 1nF
GND1 GND2
VCC
GND GND
VCC1 VCC2 VCC3
NC
OUT6 OUT5 OUT4 OUT3 OUT2 OUT1
OUT6_L OUT5_L OUT4_L OUT3_L OUT2_L OUT1_L
GND2 GND1
GND DGND
CLOAD3 1nF
DGND
CLOAD1 1nF
1 3
2
DGND
C3 0.1µF
DGND
C2 0.1µF
C7 1µF
C6 0.1µF
DGND
C1 0.1µF
RLOAD1
TBD
R1
100kΩ
RLOAD2
TBD
RLOAD3
TBD
RLOAD4
TBD
RLOAD5
TBD
RLOAD6
TBD
DGND
CLOAD4 1nF
CLOAD6 1nF
DGND DGND
DGND
DGND DGND DGND DGND
DGND DGND
OUTPUT AND POWER
CONNECTOR
P2
CLOAD5 1nF
1 2 3 4 5 6 7 8 9
10
11
12 13 14 15 16 17 18 19 20
R2
1MΩ
Figure 7. Evaluation Board Schematic

EVAL-ADD8504/ADD8505/ADD8506
Rev. 0 | Page 8 of 8
Table 4. Evaluation Board Components and Pin Descriptions
Label Description
A/B Switch pin (resistor string select)
C1 Power supply compensation capacitor (0.1 μF)
C2 Power supply compensation capacitor (0.1 μF)
C3 Power supply compensation capacitor (0.1 μF)
C4 Power supply compensation capacitor (0.1 μF)
C5 Power supply compensation capacitor (0.1 μF)
C6 Power supply compensation capacitor (0.1 μF)
C7 Power supply compensation capacitor (1 μF)
CLOAD1 Load capacitor for OUT1 (1 nF)
CLOAD2 Load capacitor for OUT2 (1 nF)
CLOAD3 Load capacitor for OUT3 (1 nF)
CLOAD4 Load capacitor for OUT4 (1 nF)
CLOAD5 Load capacitor for OUT5 (1 nF)
CLOAD6 Load capacitor for OUT6 (1 nF)
GND Ground
INA1 Input/probe pin for INA1
INB1 Input/probe pin for INB1
INA2 Input/probe pin for INA2
INB2 Input/probe pin for INB2
INA3 Input/probe pin for INA3
INB3 Input/probe pin for INB3
INA4 Input/probe pin for INA4
INB4 Input/probe pin for INB4
INA5 Input/probe pin for INA5
INB5 Input/probe pin for INB5
INA6 Input/probe pin for INA6
INB6 Input/probe pin for INB6
NC No connect
OUT1 Unloaded output probe pin for OUT1
OUT2 Unloaded output probe pin for OUT2
OUT3 Unloaded output probe pin for OUT3
OUT4 Unloaded output probe pin for OUT4
Label Description
OUT5 Unloaded output probe pin for OUT5
OUT6 Unloaded output probe pin for OUT6
OUT1_L Loaded output probe pin for OUT1
OUT2_L Loaded output probe pin for OUT2
OUT3_L Loaded output probe pin for OUT3
OUT4_L Loaded output probe pin for OUT4
OUT5_L Loaded output probe pin for OUT5
OUT6_L Loaded output probe pin for OUT6
RA1 First resistor in Gamma String A
RA2 Second resistor in Gamma String A
RA3 Third resistor in Gamma String A
RA4 Fourth resistor in Gamma String A
RA5 Fifth resistor in Gamma String A
RA6 Sixth resistor in Gamma String A
RA7 Seventh resistor in Gamma String A
RB1 First resistor in Gamma String B
RB2 Second resistor in Gamma String B
RB3 Third resistor in Gamma String B
RB4 Fourth resistor in Gamma String B
RB5 Fifth resistor in Gamma String B
RB6 Sixth resistor in Gamma String B
RB7 Seventh resistor in Gamma String B
RLOAD1 Load resistor for OUT1
RLOAD2 Load resistor for OUT2
RLOAD3 Load resistor for OUT3
RLOAD4 Load resistor for OUT4
RLOAD5 Load resistor for OUT5
RLOAD6 Load resistor for OUT6
R1 Pull-up/down resistor for A/B select (100 kΩ)
R2 Pull-down resistor for A/B select (1 MΩ)
SW1 MUX switch for GAMMA A and GAMMA B
VCC Power (+5 V)
ORDERING GUIDE
Model Description
ADD8504-EVAL Evaluation Kit
ADD8505-EVAL Evaluation Kit
ADD8506-EVAL Evaluation Kit
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.
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB05763-0-2/06(0)