參數(shù)資料
型號： TLV2731IDBV
廠商： Texas Instruments, Inc.
英文描述： Advanced LinCMOSE RAIL-TO-RAIL LOW-POWER SINGLE OPERATIONAL AMPLIFIERS
中文描述： 高級LinCMOSE軌至軌低功率運(yùn)算放大器
文件頁數(shù)： 25/28頁
文件大小： 631K
代理商： TLV2731IDBV
TLV2731, TLV2731Y
Advanced LinCMOS
RAIL-TO-RAIL
LOW-POWER SINGLE OPERATIONAL AMPLIFIERS
SLOS198 – AUGUST 1997
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
driving large capacitive loads
The TLV2731 is designed to drive larger capacitive loads than most CMOS operational amplifiers. Figure 50
through Figure 55 illustrate its ability to drive loads greater than 100 pF while maintaining good gain and phase
margins (R
null
= 0).
A small series resistor (R
null
) at the output of the device (see Figure 55) improves the gain and phase margins
when driving large capacitive loads. Figure 50 through Figure 53 show the effects of adding series resistances
of 50
, 100
, 500
, and 1000
. The addition of this series resistor has two effects: the first effect is that
it adds a zero to the transfer function and the second effect is that it 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 approximate 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 54 and
Figure 55). To use equation 1, UGBW must be approximated from Figure 54 and Figure 55.
VDD–/GND
VDD+
Rnull
CL
VI
+
–
RL
Figure 55. Series-Resistance Circuit
相關(guān)PDF資料
PDF描述
TLV2772AIDGK 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT DUAL OPERATIONAL AMPLIFIERS
TLV2772AMFK FAMILY OF 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
TLV2772AMJG FAMILY OF 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
TLV2772AMU FAMILY OF 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
TLV2772MFK FAMILY OF 2.7-V HIGH-SLEW-RATE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
相關(guān)代理商/技術(shù)參數(shù)
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