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| 型号： | TLC085ID |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| 中文描述： | 家庭具有宽带高输出驱动单电源运算放大器 |
| 文件页数： | 19/52页 |
| 文件大小： | 1462K |
| 代理商： | TLC085ID |
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SLOS254D JUNE 1999 REVISED FEBRUARY 2004
19
WWW.TI.COM
APPLICATION INFORMATION
high speed CMOS input amplifiers
The TLC08x 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 TLC08x with its 10-MHz bandwidth means that this pole normally occurs
at frequencies where there is on the order of 5dB 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 TLC08x, 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 TLC083 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
TLC08x.
VI
_
+
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
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
相关PDF资料 |
PDF描述 |
|---|---|
| TLC085IDR | FAMILY OF WIDE BANDWIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| TLC085IDRG4 | FAMILY OF WIDE BANDWIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| TLC085IN | FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| TLC085IPWP | FAMILY OF WIDE-BANDWIDTH HIGH-OUTPUT-DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| TLC085IPWPR | FAMILY OF WIDE BANDWIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TLC085IDG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:FAMILY OF WIDE BANDWIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
| TLC085IDR | 功能描述:运算放大器 - 运放 Quad Wide Bandwidth Hi-Output Sngl Sply RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC085IDRG4 | 功能描述:运算放大器 - 运放 Quad Wide Bandwidth Hi-Output Sngl Sply RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC085IN | 功能描述:运算放大器 - 运放 Quad R/R RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLC085INE4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:FAMILY OF WIDE BANDWIDTH HIGH OUTPUT DRIVE SINGLE SUPPLY OPERATIONAL AMPLIFIERS |
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