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参数资料
| 型号： | EL2176CN |
| 元件分类： | 运算放大器 |
| 英文描述： | 70 MHz/1 mA Current Mode Feedback Amp w/Disable |
| 中文描述： | 70兆赫/ 1 mA电流模反馈放大器瓦特/禁用 |
| 文件页数： | 2/20页 |
| 文件大小： | 359K |
| 代理商： | EL2176CN |
EL2176CEL2276C
70 MHz1 mA Current Mode Feedback Amp wDisable
Applications Information
Product Description
The EL2176CEL2276C are current-feedback op-
erational amplifiers that offer a wide b3dB
bandwidth of 70 MHz a low supply current of
1 mA per amplifier and the ability to disable to
0 mA Both products also feature high output
current drive The EL2176C can output 100 mA
while the EL2276C can output 55 mA per ampli-
fier The EL2176CEL2276C work with supply
voltages ranging from a single 3V to g6V and
they are also capable of swinging to with in 1V of
either supply on the input and the output Be-
cause of their current-feedback topology
the
EL2176CEL2276C do not have the normal gain-
bandwidth product associated with voltage-feed-
back operational amplifiers
This allows their
b
3 dB bandwidth to remain relatively constant
as closed-loop gain is increased This combina-
tion of high bandwidth and low power together
with aggressive pricing make the EL2176C
EL2276C the ideal choice for many low-power
high-bandwidth applications such as portable
computing HDSL and video processing
For Single Dual and Quad applications without
disable
consider the EL2170C (8-Pin Single)
EL2270C (8-Pin Dual) and EL2470C (14-Pin
Quad) If more AC performance is required refer
to the EL2180CEL2186C family which provides
Singles
Duals
and Quads with 250 MHz of
bandwidth while consuming 3 mA of supply cur-
rent per amplifier
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high-frequency device good printed
circuit board layout is necessary for optimum
performance Ground plane construction is high-
ly recommended Lead lengths should be as short
as possible The power supply pins must be well
bypassed to reduce the risk of oscillation The
combination of a 47
mF tantalum capacitor in
parallel with a 01
mF capacitor has been shown
to work well when placed at each supply pin
For good AC performance parasitic capacitance
should be kept to a minimum especially at the
inverting input (see the Capacitance at the In-
verting Input section) Ground plane construc-
tion should be used but it should be removed
from the area near the inverting input to mini-
mize any stray capacitance at that node Carbon
or Metal-Film resistors are acceptable with the
Metal-Film resistors giving slightly less peaking
and bandwidth because of their additional series
inductance Use of sockets particularly for the
SO package should be avoided if possible Sock-
ets add parasitic inductance and capacitance
which will result in some additional peaking and
overshoot
DisablePower-Down
The EL2176CEL2276C amplifiers can be dis-
abled placing their output in a high-impedance
state When disabled each amplifier’s supply cur-
rent is reduced to 0 mA
Each EL2176C
EL2276C
amplifier
is
disabled
when
its
ENABLE pin is floating or pulled up to within
05V of the positive supply Similarly each am-
plifier is enabled by pulling its ENABLE pin at
least 3V below the positive supply For g5V sup-
plies this means that an EL2176CEL2276C am-
plifier will be enabled when ENABLE is at 2V or
less and disabled when ENABLE is above 45V
Although the logic levels are not standard TTL
this choice of logic voltages allows the EL2176C
EL2276C to be enabled by tying ENABLE to
ground even in a3V single-supply applications
The ENABLE pin can be driven from CMOS
outputs or open-collector TTL
When enabled supply current does vary some-
what with the voltage applied at ENABLE For
example
with
the
supply
voltages
of
the
EL2176C at g5V if ENABLE is tied to b5V
(rather than ground) the supply current will in-
crease about 15% to 115 mA
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage- or cur-
rent-feedback amplifier can be affected by stray
capacitance at the inverting input For inverting
gains this parasitic capacitance has little effect
because the inverting input is a virtual ground
but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors)
creates a pole in the feedback path of the amplifi-
er This pole if low enough in frequency has the
same destabilizing effect as a zero in the forward
open-loop response The use of large value feed-
10
相关PDF资料 |
PDF描述 |
|---|---|
| EL2176CS | 70 MHz/1 mA Current Mode Feedback Amp w/Disable |
| EL2180CW-T13 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CW-T7 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CS-T13 | 250MHz / 3mA Current Mode Feedback Amplifiers |
| EL2180CS-T7 | 250MHz / 3mA Current Mode Feedback Amplifiers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2176CS | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:70MHz/1mA Current Mode Feedback Amp W/Disable |
| EL217C/BK/250 | 制造商:ROBNOR 功能描述:ENCAPSULANT, MARINE GRADE PU, 2K, 250G |
| EL217-V | 功能描述:晶体管输出光电耦合器 Optocouplers RoHS:否 制造商:Vishay Semiconductors 输入类型:DC 最大集电极/发射极电压:70 V 最大集电极/发射极饱和电压:0.4 V 绝缘电压:5300 Vrms 电流传递比:100 % to 200 % 最大正向二极管电压:1.65 V 最大输入二极管电流:60 mA 最大集电极电流:100 mA 最大功率耗散:100 mW 最大工作温度:+ 110 C 最小工作温度:- 55 C 封装 / 箱体:DIP-4 封装:Bulk |
| EL2180 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:250MHz/3mA Current Mode Feedback Amplifiers |
| EL2180C | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:250MHz / 3mA Current Mode Feedback Amplifiers |
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