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参数资料
| 型号： | EL2480CL-T13 |
| 英文描述： | 250MHz / 3mA Current Mode Feedback Amplifiers |
| 中文描述： | 250MHz的/ 3mA的电流模式反馈放大器 |
| 文件页数： | 3/17页 |
| 文件大小： | 661K |
| 代理商： | EL2480CL-T13 |
11
EL2180C/EL2280C/EL2480C-Preliminary
250MHz / 3mA Current Mode Feedback Amplifiers
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Feedback Resistor Values
The EL2180C/EL2280C/EL2480C have been designed
and specified at gains of +1 and +2 with RF = 750 in
PDIP and SO packages and RF = 560 in 5-pin SOT23
package. These values of feedback resistors give
250MHz of -3dB bandwidth at AV = +1 with about
2.5dB of peaking, and 180MHz of -3dB bandwidth at
AV = +2 with about 0.1dB of peaking. The 5-pin SOT23
package is characterized with a smaller value of feed-
back resistor, for a given bandwidth, to compensate for
lower parasitics within both the package itself and the
printed circuit board where it will be placed. Since the
EL2180C/EL2280C/EL2480C are current-feedback
amplifiers, it is also possible to change the value of RF to
get more bandwidth. As seen in the curve of Frequency
Response For Various RF and RG, bandwidth and peak-
ing can be easily modified by varying the value of the
feedback resistor.
Because the EL2180C/EL2280C/EL2480C are current-
feedback amplifiers, their gain-bandwidth product is not
a constant for different closed-loop gains. This feature
actually allows the EL2180C/EL2280C/EL2480C to
maintain about the same -3dB bandwidth, regardless of
closed-loop gain. However, as closed-loop gain is
increased, bandwidth decreases slightly while stability
increases. Since the loop stability is improving with
higher closed-loop gains, it becomes possible to reduce
the value of RF below the specified 560 and 750 and
still retain stability, resulting in only a slight loss of
bandwidth with increased closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL2180C/EL2280C/EL2480C have been designed
to operate with supply voltages having a span of greater
than 3V, and less than 12V. In practical terms, this
means that the EL2180C/EL2280C/EL2480C will oper-
ate on dual supplies ranging from ±1.5V to ±6V. With a
single-supply, the EL2180C/EL2280C/EL2480C will
operate from +3V to +12V.
As supply voltages continue to decrease, it becomes nec-
essary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2180C/EL2280C/EL2480C have an input voltage
range that extends to within 1V of either supply. So, for
example, on a single +5V supply, the EL2180C/
EL2280C/EL2480C have an input range which spans
from 1V to 4V. The output range of the
EL2180C/EL2280C/EL2480C is also quite large,
extending to within 1V of the supply rail. On a ±5V sup-
ply, the output is therefore capable of swinging from----
-4V to +4V. Single-supply output range is even larger
because of the increased negative swing due to the exter-
nal pull-down resistor to ground. On a single +5V
supply, output voltage range is about 0.3V to 4V.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same fre-
quency response as DC levels are changed at the output.
This is especially difficult when driving a standard video
load of 150
, because of the change in output current
with DC level. Until the EL2180C/EL2280C/EL2480C,
good Differential Gain could only be achieved by run-
ning high idle currents through the output transistors (to
reduce variations in output impedance). These currents
were typically comparable to the entire 3mA supply cur-
rent of each EL2180C/EL2280C/EL2480C amplifier!
Special circuitry has been incorporated in the
EL2180C/EL2280C/EL2480C to reduce the variation of
output impedance with current output. This results in dG
and dP specifications of 0.05% and 0.05° while driving
150
at a gain of +2.
Video Performance has also been measured with a 500
load at a gain of +1. Under these conditions, the
EL2180C/EL2280C/EL2480C have dG and dP specifi-
cations of 0.01% and 0.01° respectively while driving
500
at AV = +1.
Output Drive Capability
In spite of its low 3mA of supply current, the EL2180C
is capable of providing a minimum of ±80mA of output
current. Similarly, each amplifier of the EL2280C and
the EL2480C is capable of providing a minimum of
±50mA. These output drive levels are unprecedented in
amplifiers running at these supply currents. With a min-
imum ±80mA of output drive, the EL2180C is capable
of driving 50
loads to ±4V, making it an excellent
choice for driving isolation transformers in telecommu-
nications applications. Similarly, the ±50mA minimum
相关PDF资料 |
PDF描述 |
|---|---|
| EL2480CS-T13 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2480CS-T7 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2480CS | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2480CL-T7 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2480CL | 250MHz / 3mA Current Mode Feedback Amplifiers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2480CL-T7 | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2480CN | 制造商:Rochester Electronics LLC 功能描述:250 MHZ QUAD CMF OP AMP, 1 5 V - Bulk |
| EL2480CS | 功能描述:IC OP AMP QUAD LP 250MHZ 14-SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| EL2480CS-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:250MHz/3mA Current Mode Feedback Amplifier |
| EL2480CS-T7 | 功能描述:IC OP AMP QUAD LP 250MHZ 14-SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
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