ADD8708WCPZ-REEL7 AD [Analog Devices], ADD8708WCPZ-REEL7 Datasheet

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ADD8708WCPZ-REEL7

Manufacturer Part Number
ADD8708WCPZ-REEL7
Description
18-Channel Gamma Buffer with Regulator
Manufacturer
AD [Analog Devices]
Datasheet
1.ADD8708WCPZ-REEL7.pdf (16 pages)
FEATURES
18 precision gamma reference outputs
Mask-programmable gamma resistors:
Mask-programmable voltage regulator: 0.4% accuracy
Upper 9 buffers swing to V
Lower 9 buffers swing to GND
Single-supply operation: 7.5 V to 16.5 V
Gamma current drive: 15 mA per channel
Peak output current: 150 mA
Output voltage stable under load conditions
Pin-to-pin compatible with ADD8709
48-lead, Pb-free LQFP and LFCSP
APPLICATIONS
LCD TV panels
LCD monitor panels
GENERAL DESCRIPTION
The ADD8708 is an 18-channel integrated gamma reference for
use in high resolution LCD TV and monitors panels. The out-
put buffers feature high current drive and low offset voltage to
provide an accurate and stable gamma curve. The top nine
channels swing to V
Integrating the gamma setup resistors drastically reduces the
external component count while increasing the gamma curve
accuracy. To accommodate multiple column drivers and panel
architectures, the ADD8708 is mask programmable to a 0.2%
resolution using the on-chip 500 resistor string. An on-board
voltage regulator provides a fixed input for the resistor string,
isolating the gamma curve from the supply ripple.
The ADD8708 is specified over the temperature range of
–40°C to +105°C and comes in both a 48-lead, Pb-free,
lead-frame chip-scale package and a Pb-free, low-profile,
quad flat package.
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.
0.2% resolution and 0.1% accuracy
DD
; the lower nine channels swing to GND.
DD
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
MASK-PROGRAMMABLE
REGULATOR RESISTORS
V
V
V
V
V
V
V
V
V
GND
V
V
V
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
*ESD PROTECTION RESISTORS
18-Channel Gamma Buffer
MASK-PROGRAMMABLE
RESISTOR STRING
FUNCTIONAL BLOCK DIAGRAM
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
700Ω*
Figure 1. 48-Lead LQFP or LFCSP
1.2V
© 2004 Analog Devices, Inc. All rights reserved.
FB
+
–
700Ω*
V
REG OUT
with Regulator
V
GND GND
DD
V
DD
ADD8708
GAMMA
BUFFERS
www.analog.com
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

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ADD8708WCPZ-REEL7 Summary of contents

Page 1

FEATURES 18 precision gamma reference outputs Mask-programmable gamma resistors: 0.2% resolution and 0.1% accuracy Mask-programmable voltage regulator: 0.4% accuracy Upper 9 buffers swing Lower 9 buffers swing to GND Single-supply operation: 7 16.5 V Gamma ...

Page 2

ADD8708 TABLE OF CONTENTS Electrical Characteristics ................................................................. 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 7 Application Notes ........................................................................... 10 Tap Point Selection..................................................................... 10 Voltage Regulator ....................................................................... 11 Maximum Power ...

Page 3

ELECTRICAL CHARACTERISTICS 25°C, unless otherwise noted Table 1. Parameter GAMMA CURVE CHARACTERISTICS Accuracy Programming Resolution Total Resistor String BUFFER CHARACTERISTICS OUTPUTS Output Voltage Range (Ch18 to Ch10) Output Voltage Range (Ch9 to ...

Page 4

ADD8708 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage ( Input Voltage Storage Temperature Range 1 Operating Temperature Range Junction Temperature Range Lead Temperature Range (Soldering, 60 sec) ESD Tolerance (HBM) ESD Tolerance (MM) Table 3. Package Characteristics ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS V Table 4. Pin Function Descriptions Pin No. Name Description 1 REG Regulator Feedback. Compares a percentage of the regulator output to the internal 1.2 V voltage FB reference. Internal resistors are used to program ...

Page 6

ADD8708 Pin No. Name Description OUT OUT OUT Buffer Outputs. These buffers can swing to ground OUT OUT OUT 31 GND Ground. ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 15mA I = 25mA SINK SINK 0mA LOAD –5 –10 –15 –20 – 25mA SOURCE – 15mA I SOURCE SOURCE –35 –20 –10 0 ...

Page 8

ADD8708 1000 900 800 700 600 500 400 300 200 100 0 –0.30 –0.18 –0.10 –0.02 0.06 GAMMA OUTPUT ERROR DUE TO OFFSET AND RESISTOR MATCHING (% OF FS) Figure 9. Gamma Output Voltage Error 0.3 MAX ERROR EACH STEP ...

Page 9

TEMPERATURE ( ° C) Figure 15. Regulator Output vs. Temperature 18 C LOAD TIME (100µs/DIV) Figure 16. Regulator Line Transient ...

Page 10

ADD8708 APPLICATION NOTES The ADD8708 is a mask-programmable gamma reference generator that allows source drivers to be optimized for the different combinations of liquid crystals, glass sizes, etc. in large LCD panels. It generates 18 gamma reference outputs that can ...

Page 11

VOLTAGE REGULATOR The on-board voltage regulator provides a regulated voltage to the resistor chain to provide stable gamma voltages. The two mask-programmable internal resistors, R and a reference voltage set the output of the regulator. The typical values of these ...

Page 12

ADD8708 OPERATING TEMPERATURE RANGE The junction temperature is as follows θ × AMB JA DIS where ambient temperature. AMB θ = junction-to-ambient thermal resistance, in °C/watt power dissipated in ...

Page 13

HEAT SINK SOLDER PASTE AREA 1.90mm 5.93mm Figure 24. 48-Pin LFCSP (CP-48) Land Pattern—Dimensions Shown in Millimeters Notes: 1. Areas in black represent the board metallization. 2. Areas in white represent the solder mask and vias. 3. Hatched area is ...

Page 14

ADD8708 TYPICAL APPLICATIONS CIRCUIT NORMALLY OPEN ESD PROTECTION RESISTOR ...

Page 15

TAP POINT AND REGULATOR VOLTAGE REQUEST FORM REGULATOR SECTION—V REG OUT To ensure correct regulator operation 15 Parameter Value (6.9 V – 15 REG OUT TAP POINT SECTION Gamma output voltages are calculated ...

Page 16

... SEATING 0.05 PLANE VIEW A ROTATED 90° CCW ORDERING GUIDE 1 Model Temperature Range 2 ADD8708WCPZ-REEL7 –40°C to +105°C ADD8708WSTZ-REEL 2 –40°C to +105°C 1 Available in reels only Pb-free part. © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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