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參數(shù)資料
| 型號(hào)： | LM8207 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | TFT 18 Gamma Buffer + VCOM Driver + Voltage Reference |
| 中文描述： | 液晶18伽瑪緩沖器的VCOM驅(qū)動(dòng)電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 13/22頁(yè) |
| 文件大?。?/td> | 1393K |
| 代理商： | LM8207 |
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Application Section
(Continued)
To calculate the output voltage of the Voltage Reference
Amplifier (OUT_V
REF
) use the following equation:
(1)
As can be seen in the Electrical Characteristics Table on
page 3, I
REF
has a typical value of 10 nA. Using resistor
values for R
= 9 k
and R
= 1 k
this results in a gain of
10 and OUT_V
= 12.95 V an error will be introduced of
10 nA*9 k
= 90 μV. This error can be neglected. The
simplified formula for calculating the OUT_V
REF
is:
(2)
Example:
V
DD
= 16V
OUT_V
REF
= 14.4V
Choose R
2
= 5 k
. Using
Equation (2)
, this will result in
R
1
= 50.6 k
THE OPERATING RANGE OF THE VOLTAGE
REFERENCE
The output of the Voltage Reference Amplifier has a mini-
mum of 1.295V (R
= 0). This is determined by the value of
the internal reference. The maximum output voltage
(OUT_V
) can approach the positive supply rail V
.
The voltage is limited by the output resistance (R
) of the
output stage of the internal amplifier and depends on the
load current.
Figure 5
shows the operating output voltage
range.
The minimum headroom (OUT_V
REF
with respect to the
positive supply rail V
) can be measured using the test
circuit shown in
Figure 6
.
The headroom is measured by varying both the supply volt-
age and the output current (I
LOAD
) for a fixed programmed
value of OUT_V
REF
. As shown in
Figure 7
, the minimum
headroom slightly increases for a constant V
DD
when the
load current increases.
20137925
FIGURE 4. Typical Application Circuit for V
REF
20137921
FIGURE 5. Operating Output Voltage Range
20137924
FIGURE 6. Headroom Test Circuit with Variable Output
Current Load
L
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13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM8207MT | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| LM8207MT/NOPB | 功能描述:LCD Gamma緩沖器 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 |
| LM8207MTX | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| LM8207MTX/NOPB | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| LM825 | 制造商:Pulse Electronics Corporation 功能描述: |
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