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零件编号 | ADD8707 | ||
描述 | 12-Channel Gamma Buffers with VCOM and Regulator | ||
制造商 | Analog Devices | ||
LOGO | |||
1 Page
FEATURES
12 precision gamma reference outputs
Mask-programmable gamma resistors:
0.2% resolution and 0.1% accuracy
Mask programmable voltage regulator: 0.4% accuracy
Upper 6 buffers swing to VDD
Lower 6 buffers swing to GND
Single-supply operation: 7.5 V to 16 V
Gamma current drive: 15 mA per channel
VCOM peak output current: 250 mA
Outputs stable under load conditions
48-lead, Pb-free LFCSP package
APPLICATIONS
LCD TV panels
LCD monitor panels
PRODUCT OVERVIEW
The ADD8707 is a 12-channel integrated gamma reference with
VCOM for use in LCD TV and monitor panels. The output
buffers feature high current drive and low offset voltage to
provide an accurate and stable gamma curve. The top six
channels swing to VDD and the lower six channels swing to
GND.
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 ADD8707 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 supply ripple.
The ADD8707 is specified over the temperature range of
–40°C to +105°C and comes in a 48-lead, Pb-free, lead frame
chip-scale package.
12-Channel Gamma Buffers
with VCOM and Regulator
ADD8707
FUNCTIONAL BLOCK DIAGRAM
MASK-PROGRAMMABLE
REGULATOR RESISTORS
FB
700Ω*
GND
+
1.2V –
VIN11
VIN10
VIN8
VIN7
VIN6
VIN5
700Ω*
700Ω*
MASK-
PROGRAMMABLE
GAMMA RESISTORS
700Ω*
700Ω*
700Ω*
700Ω*
VIN3
VIN2
VIN1
700Ω*
700Ω*
700Ω*
VCOM
GAMMA
BUFFERS
VCOM OUT
VOUT12
VOUT11
VOUT10
VOUT9
VOUT8
VOUT7
VOUT6
VOUT5
VOUT4
VOUT3
VOUT2
VOUT1
*ESD PROTECTION RESISTORS
Figure 1. 48-Lead LFCSP
Rev. A
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.
ADD8707
TYPICAL PERFORMANCE CHARACTERISTICS
20
ISINK = 25mA ISINK = 15mA
15
ISINK = 5mA
10
5
0
ILOAD = 0mA
–5
–10
–15
–20
–25
ISOURCE = 25mA
–30
ISOURCE = 15mA ISOURCE = 5mA
–35
–20 –10 0 10 20 30 40 50 60 70 80 90 100 110 120
TEMPERATURE (°C)
Figure 3. Output Voltage Error vs. Temperature
35
30
CH11 SOURCE
25
20 CH12 SOURCE
15 CH11 SINK
10
CH12 SINK
5
0
0.1 1 10 100
LOAD CURRENT (mA)
Figure 4. Output Voltage Error vs. Load Current (Channels 11 and 12)
30
25
CH7 SOURCE
20
CH10 SOURCE
15
10
CH10 SINK
5
CH7 SINK
0
0.1 1 10 100
LOAD CURRENT (mA)
Figure 5. Output Voltage Error vs. Load Current (Channels 7 and 10)
30
25
20
CH6 SOURCE
15
10 CH3 SOURCE
CH6 SINK
5
CH3 SINK
0
0.1 1 10 100
LOAD CURRENT (mA)
Figure 6. Output Voltage Error vs. Load Current (Channels 3 and 6)
30
25
20
CH2 SOURCE
15
10
CH1 SOURCE
CH1 SINK
5
CH2 SINK
0
0.1 1 10 100
LOAD CURRENT (mA)
Figure 7. Output Voltage Error vs. Load Current (Channels 1 and 2)
15
14
13
12
11
10
9
8
8
7
6
5
4
3
2
1
0
0.1
VCOM SINK
VCOM SOURCE
1 10
LOAD CURRENT (mA)
100
Figure 8. Output Voltage Error vs. Load Current (VCOM)
Rev. A | Page 8 of 20
ADD8707
TYPICAL APPLICATIONS CIRCUIT
0.1µF
NORMALLY
OPEN
FB VREG OUT
700Ω*
14.4V
VCOM IN+
VCOM IN–
8.2kΩ
4.7kΩ
2kΩ 3.3µF
VIN11
VIN10
VIN8
VIN7
VIN6
VIN5
VIN3
VIN2
VIN1
5kΩ 55kΩ
+
1.2V –
14.4V
VOLTAGE
REGULATOR
TP12 = 500
0Ω
700Ω*
2.43Ω
TP11 = 419
700Ω*
1.62Ω
TP10 = 365
TP9 = 349
480Ω
700Ω*
TP8 = 343
180Ω
700Ω*
TP7 = 297
1.38kΩ
700Ω*
TP6 = 213
2.52Ω
700Ω*
TP5 = 173
1.20Ω
TP4 = 163
300Ω
700Ω*
TP3 = 146
510Ω
700Ω*
TP2 = 95
1.53kΩ
700Ω*
TP1 = 7
2.64kΩ
210Ω
VCOM
PANEL VCOM
VCOM OUT
ITO
GAMMA
BUFFERS
VOUT12
14.4V
VOUT11 12.067V
VOUT10 10.512V
VOUT9
10.051V
VOUT8
9.878V
VOUT7
8.554V
VOUT6
6.134V
VOUT5
4.982V
VOUT4
4.694V
VOUT3
4.205V
VOUT2
2.736V
VOUT1
0.202V
0.1µF
VDD
16V
*ESD PROTECTION RESISTORS
GND
GND
Figure 28. Typical Applications Circuit
GAMMA 12
GAMMA 11
GAMMA 10
GAMMA 9
GAMMA 8
GAMMA 7
GAMMA 6
GAMMA 5
GAMMA 4
GAMMA 3
GAMMA 2
GAMMA 1
GAMMA 12
GAMMA 11
GAMMA 10
GAMMA 9
GAMMA 8
GAMMA 7
GAMMA 6
GAMMA 5
GAMMA 4
GAMMA 3
GAMMA 2
GAMMA 1
GAMMA 12
GAMMA 11
GAMMA 10
GAMMA 9
GAMMA 8
GAMMA 7
GAMMA 6
GAMMA 5
GAMMA 4
GAMMA 3
GAMMA 2
GAMMA 1
Rev. A | Page 16 of 20
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页数 | 20 页 | ||
下载 | [ ADD8707.PDF 数据手册 ] |
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