參數(shù)資料
型號： TLV2254MW
廠商： Texas Instruments, Inc.
元件分類： 運動控制電子
英文描述： Advanced LinCMOSE RAIL-TO-RAIL VERY LOW-POWER OPERATIONAL AMPLIFIERS
中文描述： 高級LinCMOSE軌至軌極低功耗運算放大器
文件頁數(shù)： 38/60頁
文件大?。?/td> 1218K
代理商： TLV2254MW
TLV225x, TLV225xA
Advanced LinCMOS
RAIL-TO-RAIL
VERY LOW-POWER OPERATIONAL AMPLIFIERS
SLOS185C
–
FEBRUARY 1997
–
REVISED
–
MARCH 2001
38
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
driving large capacitive loads
The TLV2252 is designed to drive larger capacitive loads than most CMOS operational amplifiers. Figure 56
and Figure 57 illustrate its ability to drive loads up to 1000 pF while maintaining good gain and phase margins
(R
null
= 0).
A smaller series resistor (R
null
) at the output of the device (see Figure 60) improves the gain and phase margins
when driving large capacitive loads. Figure 55 and Figure 56 show the effects of adding series resistances of
10
, 50
, 100
, 200
, and 500
. The addition of this series resistor has two effects: the first adds a zero
to the transfer function and the second reduces the frequency of the pole associated with the output load in the
transfer function.
The zero introduced to the transfer function is equal to the series resistance times the load capacitance. To
calculate the improvement in phase margin, equation 1 can be used.
φ
m1
tan
–
1
2
× π ×
UGB
W
×
Rnull
×
CL
φ
m1
UGBW
R
null
improvement in phase margin
unity-gain bandwidth frequency
output series resistance
load capacitance
C
L
(1)
Where :
The unity-gain bandwidth (UGBW) frequency decreases as the capacitive load increases (see Figure 58). To
use equation 1, UGBW must be approximated from Figure 58.
Using equation 1 alone overestimates the improvement in phase margin as illustrated in Figure 59. The
overestimation is caused by the decrease in the frequency of the pole associated with the load, providing
additional phase shift and reducing the overall improvement in phase margin.
Using Figure 60, with equation 1 enables the designer to choose the appropriate output series resistance to
optimize the design of circuits driving large capacitance loads.
50 k
50 k
VDD
–
/GND
VDD+
Rnull
CL
VI
+
–
Figure 60. Series-Resistance Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLV2254MWB 制造商:TI 制造商全稱:Texas Instruments 功能描述:Advanced LinCMOS RAIL-TO-RAIL VERY LOW-POWER POERATIONAL AMPLIFIERS
TLV2254QD 功能描述:運算放大器 - 運放 Quad Rail To Rail Lo Vltg Lo Power RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
TLV2254QDG4 功能描述:運算放大器 - 運放 Quad Rail-To-Rail Lo Vltg Lo Pwr Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
TLV2254QDR 功能描述:運算放大器 - 運放 Quad Rail To Rail Lo Vltg Lo Power RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
TLV2254QDREP 功能描述:運算放大器 - 運放 Mil Enhance Adv Lin CMOS Rail-to-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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