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PDF ADD8709ASTZ-REEL Data sheet ( Hoja de datos )
| Número de pieza | ADD8709ASTZ-REEL | |
| Descripción | 18-Channel Gamma Buffer with Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
APPLICATIONS
TFT LCD monitor panels
TFT LCD TV panels
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
–40°C to +100°C and comes in a robust, low profile quad
flat package.
18-Channel Gamma Buffer
with Regulator
ADD8709
FUNCTIONAL BLOCK DIAGRAM
48 47 46 45 44 43 42 41 40 39 38 37
1
2 VREG
3
4
5
6
7
8
9
10
11
12
18 18
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
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 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADD8709
48 47 46 45 44 43 42 41 40 39 38 37
REGFB 1
GND 2
VDD 3
REGOUT 4
VIN18 5
VIN17 6
VIN16 7
VIN15 8
VIN14 9
VIN13 10
VIN12 11
VIN11 12
PIN 1
IDENTIFIER
ADD8709
TOP VIEW
(Not to Scale)
36 VOUT10
35 VOUT9
34 VOUT8
33 VOUT7
32 VDD
31 GND
30 VOUT6
29 VOUT5
28 VOUT4
27 VOUT3
26 VOUT2
25 VOUT1
13 14 15 16 17 18 19 20 21 22 23 24
Figure 2. 48-Lead Low Profile Quad Flat Package (ST-48)
Table 4. Pin Function Descriptions
Pin No. Mnemonic Name
Description
1
REGFB
Regulator Feedback Compares a percentage of the regulator output to the internal voltage reference. Internal
resistors are used to program the desired regulator output voltage.
2 GND Ground
Ground. Nominally 0 V.
3 VDD
Supply
Supply voltage or source voltage. Nominally 16 V.
4
REGOUT
Regulator Output
Provides a regulated output voltage for use as a reference for additional external gamma
channels.
5 VIN18
6 VIN17
7 VIN16
8 VIN15
9 VIN14
10 VIN13
11 VIN12
12 VIN11
13 VIN10
14 VIN9
15 VIN8
16 VIN7
17 VIN6
18 VIN5
19 VIN4
20 VIN3
21 VIN2
22 VIN1
23 GND
24 VDD
25 VOUT1
26 VOUT2
Input
Ground
Supply
Output
Buffer input.
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
5 Page 
11
10
9
8
7
6
5
4
3
2
1
0
–200 0
10V PULSE
120pF
320pF
520pF
1nF
10nF
200 400 600 800 1000 1200 1400 1600 1800
TIME (ns)
Figure 22. Transient Load Response vs. Capacitive Loading
20
1040pF
540pF
340pF
10
100pF
50pF
0
–10
–20
–30
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 23. Frequency Response vs. Capacitive Loading
10
GAMMA 1-9
0
2kΩ
10kΩ
1kΩ
–10
–20
150Ω
–30
–40
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 24. Frequency Response vs. Resistive Loading
ADD8709
10
GAMMA 10-18
0
–10
2kΩ
10kΩ
1kΩ
–20
150Ω
–30
–40
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 25. Frequency Response vs. Resistive Loading
10
VDD = 16V
VCOM
0
2kΩ
10kΩ
–10
1kΩ
–20
–30
150Ω
–40
–50
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 26. Frequency Response vs. Resistive Loading
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADD8709ASTZ-REEL.PDF ] | |
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