參數(shù)資料
型號(hào)： BUF11702PWP
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 501K
代理商： BUF11702PWP
BUF11702
10+1-CHANNEL LCD GAMMA CORRECTION BUFFER
SLOS359B
–
MARCH 2001
–
REVISED OCTOBER 2001
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gamma correction
Figure 46 shows a typical 10-reference voltage gamma correction curve. As can be seen from this curve, the
various voltages that each buffer encounters vary greatly.
VDD1
GMA1
GMA2
GMA3
GMA4
GMA5
GMA6
GMA7
GMA8
GMA9
GMA10
VSS10
10
20
30
40
Input Data HEX0
Figure 46. Gamma Correction Curve
The LCD source driver DAC uses the reference voltages and internal resistor ladder to produce individual
voltages for each input code.
For gamma correction voltages GMA1 through GMA5, the voltage levels would be between V
DD1
/2 and V
DD1
,
and for GMA6 through GMA10, the voltage levels would be between GND and V
DD1
/2. That means that buffers 1
to 5 must have input stages that swing close to the positive rail, but will not have to swing very close to ground (or
the negative rail). Therefore buffers 1 through 5 have only a single NMOS input pair. Buffers 6 to 10 have similar
but opposite requirements in that they must have input ranges that go down to ground (or negative rail), enabling
them to have only a PMOS input pair.
The output stages have been designed to match the characteristic of the input stage. That means that the output
stage of buffer 1 swings very close to the positive range, whereas its ability to swing to GND (or negative rail) is
limited. Buffers 2 to 5 have output stages with slightly larger output resistances, as they will not have to swing as
close to the positive rail as buffer 1. The converse is true for buffers 6 to 10 in the sense that they have to swing
closer to ground than the positive rail.
This approach significantly reduces the silicon area and cost of the whole solution. However due to this
architecture the right buffer needs to be connected to the right gamma correction voltage. Connect buffer 1 to the
gamma voltage closest to the positive rail, buffers 2 to 5 to the following voltages. Buffer 10 should be connected
to the gamma correction voltage closest to GND (or the negative rail), buffers 9 through 6 to the following
voltages.
When the LCD source driver has its gamma correction curves matched to the LCD panel, not all 10 reference
inputs will be required; quite often only 4 might be used. The quad channel BUF4701 is an ideal device for these
applications; it combines high drive with wide bandwidth in a 10-pin MSOP.
相關(guān)PDF資料
PDF描述
BUF11705 22 - V Supply, 10 + 1 Channel Gamma Correction Buffer
BUF11705AIPWPR 22 - V Supply, 10 + 1 Channel Gamma Correction Buffer
BUF12800 REFERENCE VOLTAGE GENERATOR for LCD GAMMA CORRECTION
BUF12800AIPWP REFERENCE VOLTAGE GENERATOR for LCD GAMMA CORRECTION
BUF12800AIPWPR REFERENCE VOLTAGE GENERATOR for LCD GAMMA CORRECTION
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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BUF11702PWPR 功能描述:LCD Gamma緩沖器 10+1 Channel High Current Buffer 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
BUF11702PWPRG4 功能描述:LCD Gamma緩沖器 10+1 Channel High Current Buffer 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
BUF11704 制造商:BB 制造商全稱(chēng):BB 功能描述:18 - V SUPPLY MULTI - CHANNER GAMMA CORRECTION BUFFER
BUF11704AIPWP 功能描述:LCD Gamma緩沖器 18-V Supply Multi-Ch Correction 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
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