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參數(shù)資料
| 型號(hào)： | buf06703 |
| 英文描述： | MULTI-CHANNEL LEC GAMMA CORRECTION BUFFER |
| 中文描述： | 多通道緩沖晶狀體上皮伽瑪校正 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 487K |
| 代理商： | BUF06703 |
SBOS269A
–
MARCH 2003
–
REVISED JUNE 2003
www.ti.com
16
INPUT VOLTAGE RANGE GAMMA BUFFERS
Figure 36 shows a typical gamma correction curve with 10
gamma correction reference points (GMA1 through
GMA10). As can be seen from this curve, the voltage
requirements for each buffer varies greatly. The swing
capability of the input stages of the various buffers in the
BUFxx703 is carefully matched to the application. Using
the example of the BUF07703 with six gamma correction
channels, buffers 1 to 3 have input stages that include
V
DD
, but will only swing within 1V to GND. Buffers 1
through 5 have only a single NMOS input stage. Buffers
4 through 6 have only a single PMOS input stage. The
input range of the PMOS input stage includes GND.
VDD1
GMA1
GMA2
GMA3
GMA4
GMA5
GMA6
GMA7
GMA8
GMA9
GMA10
VSS10
10
20
30
40
Input Data HEX0
Figure 36. Gamma Correction Curve.
OUTPUT VOLTAGE SWING GAMMA BUFFERS
The output stages have been designed to match the
characteristic of the input stage. Once again using the
example of the BUF07703 means that the output stage of
buffer 1 swings very close to V
DD
, typically V
CC
–
100mV
at 5mA; its ability to swing to GND is limited. Buffers 2 and
3 have smaller output stages with slightly larger output
resistances, as they will not have to swing as close to the
positive rail as buffer 1. Buffers 4 through 6 swing closer
to GND than V
DD
. Buffer 6 is designed to swing very close
to GND, typically GND + 100mV at a 5mA load current.
See the typical characteristics for more details. This
approach significantly reduces the silicon area and cost of
the whole solution. However, due to this architecture, the
correct buffer needs to be connected to the correct
gamma correction voltage. Connect buffer 1 to the
gamma voltage closest to V
DD
, and buffers 2 and 3 to the
sequential voltages. Buffer 6 should be connected to the
gamma correction voltage closest to GND (or the
negative rail), buffers 4 and 5 to the sequential higher
voltages.
COMMON BUFFER (V
COM
)
The common buffer output of the BUF07703 and
BUF05703 has a greater output drive capability than the
gamma correction buffers, to meet the heavier current
demands of driving the common node of the LCD panel.
It was also designed to drive heavier capacitive loads
and still remain stable, as shown in Figure 37.
0
5
10
15
20
25
30
35
40
45
10
100
1000
P
–
CL
–
Load Capacitance
–
pF
VDD = 10 V
RL = 2 k
VCOM
Figure 37. Phase Shift vs Load Capacitance.
CAPACITIVE LOAD DRIVE
The BUFxx703 has been designed to be able to
sink/source DC currents in excess of 10mA. Its output
stage has been designed to deliver output current
transients with little disturbance of the output voltage.
However, there are times when very fast current pulses
are required. Therefore, in LCD source-driver buffer
applications, it is quite normal for capacitors to be
placed at the outputs of the reference buffers. These
are to improve the transient load regulation. These will
typically vary from 100pF and more. The BUFxx703
gamma buffers were designed to drive capacitances in
excess of 100pF and retain effective phase margins
above 50
°
, as shown in Figure 38.
CL
–
Load Capacitance
–
pF
VDD = 10 V
RL = 2 k
0
20
40
60
80
100
120
140
10
100
1000
P
–
BUF07703: Channels 1 to 6
BUF06703: Channels 1 to 6
BUF05703: Channels 1 to 4
Figure 38. Phase Shift Between Output and Input
vs Load Capacitance for the gamma buffers
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BUF07703 | MULTI-CHANNEL LEC GAMMA CORRECTION BUFFER |
| BUF07704AIPWP | 18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER |
| BUF07704AIPWPR | 18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER |
| BUF11704 | 18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER |
| BUF11704AIPWP | 18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BUF06703PW | 功能描述:LCD Gamma緩沖器 5 Ch LCD Gamma Crction Buffer +Vcom RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF06703PWG4 | 功能描述:LCD Gamma緩沖器 5Ch LCD Gamma Corr Buffer +Vcom RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF06703PWR | 功能描述:LCD Gamma緩沖器 5 Ch LCD Gamma Crction Buffer +Vcom RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF06703PWRG4 | 功能描述:LCD Gamma緩沖器 5 Ch LCD Gamma Crction Buffer +Vcom RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube |
| BUF06704 | 制造商:BB 制造商全稱:BB 功能描述:18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER |
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