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參數(shù)資料
| 型號： | BUF16820 |
| 英文描述： | 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory |
| 中文描述： | 14通道伽瑪電壓發(fā)生器具有可編程威科姆輸出和OTP存儲器 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大?。?/td> | 681K |
| 代理商： | BUF16820 |
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SBOS356A FEBRUARY 2006 REVISED OCTOBER 2006
www.ti.com
16
PROGRAMMABLE V
COM
The V
COM
channels of the BUF16820 can swing to 2.5V
from the positive supply rail while sourcing 100mA, and to
1V above the negative rail while sinking 100mA (see
Figure 4, typical characteristic
Output Voltage vs Output
Current
). The gamma and the V
COM
values can be
permanently stored in the internal OTP memory. The V
COM
channels can be programmed independantly from the
gamma channels. Figure 14 shows the BUF16820 being
used for V
COM
voltages.
BUF16820
SDA
SCL
R
Control Interface
Gamma
References
OUT1
OUT2
OUT13
OUT14
V
COM
V
COM1
V
COM2
Figure 14. BUF16820 Used for Programmable
V
COM
REFH AND REFL INPUT RANGE
Best performance and output swing range of the
BUF16820 are achieved by applying REFH and REFL
voltages that are slightly below the power-supply voltages.
Most
specifications
have
REFH = V
S
200mV and REFL = GND + 200mV. The
REFH internal buffer is designed to swing very closely to
V
S
, and the REFL internal buffer to GND. However, there
is a finite limit on how close they can swing before
saturating. To avoid saturation of the internal REFH and
REFL buffers, the REFH voltage should not be greater
than V
S
100mV and REFL voltage should not be lower
than GND + 100mV. Figure 15 shows the swing capability
of the REFH and REFL buffers.
been
tested
at
18
17
16
15
3
2
1
0
O
0
10
20
100
40
50
60
70
80
90
30
Output Current (mA)
REFH OUT (sourcing)
REFH OUT (sinking)
Figure 15. Reference Buffer Output Voltage
vs Output Current
The other consideration when trying to maximize the
output swing capability of the gamma buffers is the
limitation in the swing range of output buffers (OUT114,
V
COM1
, and V
COM2
), which depends on the load current. A
typical load in the LCD application is 5mA to 10mA. For
example, if OUT1 is sourcing 10mA, the swing is typically
limited to about V
S
200mV. The same applies to OUT14,
which typically limits at GND + 200mV when sinking
10mA. An increase in output swing can only be achieved
for much lighter loads. For example, a 3mA load typically
allows the swing to be increased to approximately
V
S
100mV and GND + 100mV.
Connecting REFH directly to V
S
and REFL directly to GND
does not damage the BUF16820. As discussed above
however, the output stages of the REFH and REFL buffers
will saturate. This condition is not desirable and can result
in a small error in the measured output voltages of
OUT114, V
COM1
, and V
COM2
. As described above, this
method of connecting REFH and REFL does not help to
maximize the output swing capability.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BUF16820AIDAPR | 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory |
| BUF16820AIDAPRG4 | 14-Channel GAMMA VOLTAGE GENERATOR with Programmable VCOM Outputs and OTP Memory |
| BUF20800 | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
| BUF20800AIDCPR | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
| BUF20820 | 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BUF16820AIDAPR | 功能描述:LCD Gamma緩沖器 14-Ch Vltg Generator w/2 Prog VCOM Out 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 |
| BUF16820AIDAPRG4 | 功能描述:LCD Gamma緩沖器 14-Ch Vltg Generator w/2 Prog VCOM Out 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 |
| BUF16821 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory |
| BUF16821_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory |
| BUF16821A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory |
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