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參數(shù)資料
| 型號： | LM6181IM-8 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 100 mA, 100 MHz Current Feedback Amplifier |
| 中文描述： | VIDEO AMPLIFIER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大小： | 1848K |
| 代理商： | LM6181IM-8 |
Typical Applications
(Continued)
SLEW RATE CONSIDERATIONS
The slew rate characteristics of current feedback amplifiers
are different than traditional voltage feedback amplifiers. In
voltage feedback amplifiers slew rate limiting or non-linear
amplifier behavior is dominated by the finite availability of the
1st stage tail current charging the compensation capacitor.
The slew rate of current feedback amplifiers, in contrast, is
not constant. Transient current at the inverting input deter-
mines slew rate for both inverting and non-inverting gains.
The non-inverting configuration slew rate is also determined
by input stage limitations. Accordingly, variations of slew
rates occur for different circuit topologies.
DRIVING CAPACITIVE LOADS
The LM6181 can drive significantly larger capacitive loads
than many current feedback amplifiers. Although the
LM6181 can directly drive as much as 100 pF without oscil-
lating, the resulting response will be a function of the feed-
back resistor value. Figure 5 illustrates the small-signal
pulse response of the LM6181 while driving a 50 pF load.
Ringing persists for approximately 70 ns. To achieve pulse
responses with less ringing either the feedback resistor can
be increased (see typical curves Suggested R
f
and R
for
C
), or resistive isolation can be used (10
–51
typically
works well). Either technique, however, results in lowering
the system bandwidth.
Figure 6 illustrates the improvement obtained with using a
47
isolation resistor.
DS011328-15
3a: R
f
= 820
DS011328-16
3b: R
f
= 1640
FIGURE 3. Increasing Compensation
with Increasing R
f
DS011328-17
FIGURE 4. Reducing R
f
for Large
Closed Loop Gains, R
f
= 500
DS011328-18
5a
DS011328-19
5b
FIGURE 5. A
= 1, LM6181 Can Directly
Drive 50 pF of Load Capacitance with 70 ns
of Ringing Resulting in Pulse Response
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM6181IM-8/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 100Mhz Crnt FB 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(bǔ)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 |
| LM6181IM-8/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM6181IMX | 功能描述:IC AMP CURR FEEDBK 100MHZ 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:VIP™ II 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| LM6181IMX/NOPB | 制造商:Texas Instruments 功能描述:OP Amp Single Current Fdbk |
| LM6181IMX-8 | 功能描述:運(yùn)算放大器 - 運(yùn)放 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(bǔ)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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