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參數資料
| 型號： | LMH6657 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 270MHz Single Supply, Single & Dual Amplifiers |
| 中文描述： | 270MHz單電源，單 |
| 文件頁數： | 16/20頁 |
| 文件大小： | 788K |
| 代理商： | LMH6657 |
Output Characteristics
OUTPUT CURRENT CAPABILITY
The LMH6657/6658 output swing for a given load can be
determined by referring to the Output Voltage vs. Output
Current plots (Typical Performance Characteristics section).
Characteristic Tables show the output current when the out-
put is 1V from either rail. The plots and table values can be
used to predict closed loop continuous value of current for a
given load. If left unchecked, the output current capability of
the LMH6657/6658 could easily result in junction tempera-
ture exceeding the maximum allowed value specified under
Absolute Maximum Ratings. Proper heat sinking or other
precautions are required if conditions as such, exist.
Under transient conditions, such as when the input voltage
makes a large transition and the output has not had time to
reach its final value, the device can deliver output currents in
excess of the typical plots mentioned above. Plots shown in
Figure 5
and below, depict how the output current capability
improves under higher input overdrive voltages:
The LMH6657/6658 output stage is designed to swing within
approximately one diode drop of each supply voltage by
utilizing specially designed high speed output clamps. This
allows adequate output voltage swing even with 5V supplies
and yet avoids some of the issues associated with rail-to-rail
output operational amplifiers. Some of these issues are:
Supply current increases when output reaches saturation
at or near the supply rails
Prolonged recovery when output approaches the rails
The LMH6657/6658 output is exceedingly well-behaved
when it comes to recovering from an overload condition. As
can be seen from
Figure 6
below, the LMH6657/6658 will
typically recover from an output overload condition in about
18ns, regardless of the duration of the overload.
OUTPUT PHASE REVERSAL
This is a problem with some operational amplifiers. This
effect is caused by phase reversal in the input stage due to
saturation of one or more of the transistors when the inputs
exceed the normal expected range of voltages. Some appli-
cations, such as servo control loops among others, are
sensitive to this kind of behavior and would need special
safeguards to ensure proper functioning. The LMH6657/
6658 is immune to output phase reversal with input overload.
With inputs exceeded, the LMH6657/6658 output will stay at
the clamped voltage from the supply rail. Exceeding the
input supply voltages beyond the Absolute Maximum Rat-
ings of the device could however damage or otherwise ad-
versely effect the reliability or life of the device.
DRIVING CAPACITIVE LOADS
The LMH6657/6658 can drive moderate values of capaci-
tance by utilizing a series isolation resistor between the
output and the capacitive load. Typical Performance Char-
acteristics section shows the settling time behavior for vari-
ous capacitive loads and 20
of isolation resistance. Ca-
pacitive load tolerance will improve with higher closed loop
gain values. Applications such as ADC buffers, among oth-
ers, present complex and varying capacitive loads to the Op
Amp; best value for this isolation resistance is often found by
experimentation and actual trial and error for each applica-
tion.
DISTORTION
Applications with demanding distortion performance require-
ments are best served with the device operating in the
inverting mode. The reason for this is that in the inverting
configuration, the input common mode voltage does not vary
20053247
FIGURE 4. V
OUT
vs. I
SOURCE
(for Various Overdrive)
20053248
FIGURE 5. V
OUT
vs. I
SINK
(for Various Overdrive)
20053249
FIGURE 6. Output Overload Recovery
L
www.national.com
16
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6657MF | 制造商:Texas Instruments 功能描述:OP Amp Single Volt Fdbk ±6V/12V 5-Pin SOT-23 T/R 制造商:Texas Instruments 功能描述:AMP, 3V 270MHZ, POWERWISE, SOT23-5 制造商:Texas Instruments 功能描述:AMP, 3V 270MHZ, POWERWISE, SOT23-5; Op Amp Type:High Speed; No. of Amplifiers:1; Slew Rate:700V/s; Supply Voltage Range:3V to 12V; Amplifier Case Style:SOT-23; No. of Pins:5; Bandwidth:270MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes |
| LMH6657MF/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6657MFX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6657MFX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6657MG | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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