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| 型号： | LT1228IN8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/22页 |
| 文件大小： | 0K |
| 描述： | IC CURRNT FEEDBK AMP 100MHZ 8DIP |
| 标准包装： | 50 |
| 放大器类型： | 电流反馈 |
| 电路数： | 1 |
| 转换速率： | 3500 V/µs |
| -3db带宽： | 100MHz |
| 电流 - 输入偏压： | 10µA |
| 电压 - 输入偏移： | 3000µV |
| 电流 - 电源： | 6mA |
| 电流 - 输出 / 通道： | 125mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
LT1228
13
1228fd
APPLICATIONS INFORMATION
Capacitive Loads
TheLT1228currentfeedbackamplifiercandrivecapacitive
loadsdirectlywhenthepropervalueoffeedbackresistoris
used.ThegraphofMaximumCapacitiveLoadvsFeedback
Resistor should be used to select the appropriate value.
The value shown is for 5dB peaking when driving a 1k
load, at a gain of 2. This is a worst case condition, the
amplifierismorestableathighergains,anddrivingheavier
loads. Alternatively, a small resistor (10 to 20) can be
put in series with the output to isolate the capacitive load
from the amplifier output. This has the advantage that the
amplifier bandwidth is only reduced when the capacitive
load is present and the disadvantage that the gain is a
function of the load resistance.
Slew Rate
The slew rate of the current feedback amplifier is not inde-
pendent of the amplifier gain configuration the way it is in
a traditional op amp. This is because the input stage and
the output stage both have slew rate limitations. The input
stage of the LT1228 current feedback amplifier slews at
about 100V/s before it becomes nonlinear. Faster input
signalswillturnonthenormallyreversebiasedemitterson
theinputtransistorsandenhancetheslewratesignificantly.
This enhanced slew rate can be as much as 3500V/s!
Current Feedback Amp Large-Signal Response
VS = ±15V, RF = RG = 750 Slew Rate Enhanced
The output slew rate is set by the value of the feedback
resistors and the internal capacitance. At a gain of ten with
a 1k feedback resistor and ±15V supplies, the output slew
rate is typically 500V/s and –850V/s. There is no input
stage enhancement because of the high gain. Larger feed-
back resistors will reduce the slew rate as will lower supply
voltages, similar to the way the bandwidth is reduced.
Current Feedback Amp Large-Signal Response
VS = ±15V, RF = 1k, RG = 110, RL = 400
Settling Time
The characteristic curves show that the LT1228 current
feedback amplifier settles to within 10mV of final value
in 40ns to 55ns for any output step less than 10V. The
curve of settling to 1mV of final value shows that there
is a slower thermal contribution up to 20s. The thermal
settling component comes from the output and the input
stage. The output contributes just under 1mV/V of output
changeandtheinputcontributes300V/Vofinputchange.
Fortunately the input thermal tends to cancel the output
thermal. For this reason the noninverting gain of two
configuration settles faster than the inverting gain of one.
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| LT1228IS8#PBF | IC CRNT FEEDBK AMP 100MHZ 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1228IS8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228IS8#PBF | 功能描述:IC CRNT FEEDBK AMP 100MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1228IS8#TRPBF | 功能描述:IC CRNT FEEDBK AMP 100MHZ 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1228M | 制造商:LINER 制造商全称:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
| LT1228MJ8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100MHz Current Feedback Amplifier with DC Gain Control |
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