參數(shù)資料
型號(hào)： TLC075IPWPRG4
廠商： Texas Instruments, Inc.
英文描述： FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
中文描述： 家庭具有寬帶高輸出驅(qū)動(dòng)單電源運(yùn)算放大器
文件頁數(shù)： 19/48頁
文件大?。?/td> 1839K
代理商： TLC075IPWPRG4
SLOS219E JUNE 1999 REVISED SEPTEMBER 2006
19
WWW.TI.COM
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
APPLICATION INFORMATION
high speed CMOS input amplifiers
The TLC07x is a family of high-speed low-noise CMOS input operational amplifiers that has an input
capacitance of the order of 20 pF. Any resistor used in the feedback path adds a pole in the transfer function
equivalent to the input capacitance multiplied by the combination of source resistance and feedback resistance.
For example, a gain of 10, a source resistance of 1 k
, and a feedback resistance of 10 k
add an additional
pole at approximately 8 MHz. This is more apparent with CMOS amplifiers than bipolar amplifiers due to their
greater input capacitance.
This is of little consequence on slower CMOS amplifiers, as this pole normally occurs at frequencies above their
unity-gain bandwidth. However, the TLC07x with its 10-MHz bandwidth means that this pole normally occurs
at frequencies where there is on the order of 5 dB gain left and the phase shift adds considerably.
The effect of this pole is the strongest with large feedback resistances at small closed loop gains. As the
feedback resistance is increased, the gain peaking increases at a lower frequency and the 180 phase shift
crossover point also moves down in frequency, decreasing the phase margin.
For the TLC07x, the maximum feedback resistor recommended is 5 k
; larger resistances can be used but a
capacitor in parallel with the feedback resistor is recommended to counter the effects of the input capacitance
pole.
The TLC073 with a 1-V step response has an 80% overshoot with a natural frequency of 3.5 MHz when
configured as a unity gain buffer and with a 10-k
feedback resistor. By adding a 10-pF capacitor in parallel with
the feedback resistor, the overshoot is reduced to 40% and eliminates the natural frequency, resulting in a much
faster settling time (see Figure 49). The 10-pF capacitor was chosen for convenience only.
Load capacitance had little effect on these measurements due to the excellent output drive capability of the
TLC07x.
_
+
600
22 pF
50
10 k
10 pF
IN
With
CF = 10 pF
VDD =
±
5 V
AV = +1
RF = 10 k
RL = 600
CL = 22 pF
VI
0
0.5
1
1.5
1
0
1
2
0
0.2 0.4 0.6 0.8
t - Time -
μ
s
1
1.2 1.4 1.6
VO
VIN
VOUT
0.5
Figure 49. 1-V Step Response
相關(guān)PDF資料
PDF描述
TLC0820A(中文) Advanced LinCMOS 8-Bit Analog-To-Digital Converters(8位高速A/D轉(zhuǎn)換器(帶改進(jìn)的flash))
TLC0831(中文) 8-Bit Successive-Approximation Analog-To-Digital Converters(單輸入通道，串行I/O接口8位A/D轉(zhuǎn)換器)
TLC0832(中文) 8-Bit Successive-Approximation Analog-To-Digital Converters(多重雙輸入通道，串行I/O接口8位A/D轉(zhuǎn)換器)
TLC0834(中文) 8-Bit Successive-Approximation Analog-To-Digital Converters(4通道，串行I/O接口8位A/D轉(zhuǎn)換器)
TLC0838(中文) 8-Bit Successive-Approximation Analog-To-Digital Converters(8通道，串行I/O接口8位A/D轉(zhuǎn)換器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLC07XA 制造商:TI 制造商全稱:Texas Instruments 功能描述:FAMILY OF WIDE BAND WIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
TLC080 制造商:TI 制造商全稱:Texas Instruments 功能描述:FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
TLC080_06 制造商:TI 制造商全稱:Texas Instruments 功能描述:FAMILY OF WIDE - BANDWITH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
TLC080_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:FAMILY OF WIDE-BANDWIDTH HIGH-OUPTUP-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
TLC080_08 制造商:TI 制造商全稱:Texas Instruments 功能描述:FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS
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