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参数资料
| 型号： | EL2005CG |
| 英文描述： | High Accuracy Fast Buffer |
| 中文描述： | 高精度快速缓冲 |
| 文件页数： | 10/12页 |
| 文件大小： | 244K |
| 代理商： | EL2005CG |
EL2005EL2005C
High Accuracy Fast Buffer
Applications Information
Recommended Layout Precautions
RFvideo printed circuit board layout rules
should be followed when using the EL2005 since
it will provide power gain to frequencies over
100 MHz Ground planes are recommended and
power supplies should be decoupled at each de-
vice with low inductance capacitors In addition
ground plane shielding may be extended to the
metal case of the device since it is electrically iso-
lated from internal circuitry Alternatively the
case should be connected to the output to mini-
mize input capacitance
Offset Voltage Adjustment
The EL2005’s offset voltages have been actively
trimmed by laser to meet guaranteed specifica-
tions when the offset preset pin is shorted to the
offset adjust pin The pre-calibration allows the
devices to be used in most DC or AC applications
without individually offset nulling each device If
offset null is desirable it is simply obtained by
leaving the offset preset pin open and connecting
a trim pot of 200
X between the offset adjust pin
and Vb as illustrated on page 4
Operation from Single or Asymmetrical
Power Supplies
This device type may be readily used in applica-
tions where symmetrical supplies are unavailable
or not desirable In this case an apparent output
offset occurs due to the device’s voltage gain of
less than unity This additional output offset er-
ror may be predicted by
DVOj(1bAV)
(VabVb)
2
e
0005 (VabVb)
where AV e No load voltage gain typically 099
Vae Positive supply voltage
Vbe Negative supply voltage
For example with Vaea5V and Vbe
b
12V
DVO would be b35 mV This may be ad-
justed to zero as described above
Short Circuit Protection
In order to optimize transient response and out-
put swing output current limit has been omitted
from the EL2005 Short circuit protection may be
added by inserting appropriate value resistors be-
tween Va and VCa pins and Vb and VCb pins
as shown on page 4
Resistor values may be predicted by
RLIM j
Va
ISC
e
Vb
ISC
where ISC s 100 mA for EL2005
The inclusion of limiting resistors in the collec-
tors of the output transistors reduces output volt-
age swing Decoupling VCa and VCb pins with
capacitors to ground will retain full output swing
for transient pulses An alternate active current
limit technique that retains full DC output swing
is also shown on page 4 In this circuit the cur-
rent sources are saturated during normal opera-
tion thus applying full supply voltage to the VC
pins Under fault conditions the voltage decreas-
es as required by the overload
RLIM j
VBE
ISC
e
06V
60 mA
e
10
X
Capacitive Loading
The EL2005 is designed to drive capacitive loads
such as coaxial cables in excess of several thou-
sand picofarads without susceptibility to oscilla-
tion
However
peak current resulting from
(C c dVdt) should be limited below absolute
maximum peak current ratings for the devices
Thus
DVIN
Dt
c
CL s IOUT s g250 mA
In addition
power dissipation resulting from
driving capacitive loads plus standby power
should be kept below the total package power
rating
PDpkg t PDC a PAC
PDpkg t (Vab Vb) c IS a PAC
PAC j (VP-P)2 c f c CL
where VP-P e Peak-to-peak output voltage
swing
f e Frequency
CL e Load Capacitance
7
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PDF描述 |
|---|---|
| EL2005G | High Accuracy Fast Buffer |
| EL2006 | High Gain Fast FET Input Op Amp |
| EL2006ACG | High Gain Fast FET Input Op Amp |
| EL2006AG | High Gain Fast FET Input Op Amp |
| EL2006CG | High Gain Fast FET Input Op Amp |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2005CG/E+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Buffer/Voltage Follower |
| EL2005G | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:High Accuracy Fast Buffer |
| EL2005G/883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Buffer/Voltage Follower |
| EL2006 | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:High Gain Fast FET Input Op Amp |
| EL2006ACG | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:High Gain Fast FET Input Op Amp |
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