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參數(shù)資料
| 型號(hào)： | ELH0101K |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | Power Operational Amplifier |
| 中文描述： | 功率運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 326K |
| 代理商： | ELH0101K |
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ELH010188385089012YX
Power Operational Amplifier
Applications Information
Input Voltages
The ELH0101 operational amplifier contains
JFET input devices which exhibit high reverse
breakdown voltages from gate to source or drain
This eliminates the need for input clamp diodes
so that high differential input voltages may be
applied without a large increase in input current
However neither input voltage should be allowed
to exceed the negative supply as the resultant
high current flow may destroy the unit
Exceeding the negative common-mode limit on
either input will cause a reversal of the phase to
the output and force the amplifier output to the
corresponding high or low state Exceeding the
negative common-mode limit on both inputs will
force the amplifier output to a high state In nei-
ther case does a latch occur since raising the in-
put back within the common-mode range again
puts the input stage and thus the amplifier in a
normal operating mode
Exceeding the positive common-mode limit on a
single input will not change the phase of the out-
put however if both inputs exceed the limit the
output of the amplifier will be forced to a high
state
These amplifiers will operate with the common-
mode input voltage equal to the positive supply
In fact the common-mode voltage may exceed
the positive supply by approximately 100 mV in-
dependent of supply voltage and over the full op-
erating temperature range The positive supply
may therefore be used as a reference on an input
as for example in a supply current monitor and
or limiter
With the ELH0101 there is a temptation to re-
move the bias current compensation resistor nor-
mally used on the non-inverting input of a sum-
ming amplifier Direct connection of the inputs
to ground or a low-impedance voltage source is
not recommended with supply voltages greater
than 3V The potential problem involves loss of
one supply which can cause excessive current in
the second supply Destruction of the IC could
result if the current to the inputs of the device is
not limited to less than 100 mA or if there is
much more than 1
mF bypass on the supply bus
Although difficulties can be largely avoided by
installing clamp diodes across the supply lines on
every PC board a conservative design would in-
clude enough resistance in the input lead to limit
current to 10 mA if the input lead is pulled to
either supply by internal currents This precau-
tion is by no means limited to the ELH0101
Layout Considerations
When working with circuitry capable of resolving
picoampere level signals leakage currents in cir-
cuitry external to the op amp can significantly
degrade performance High quality insulation is a
must (Kel-F and Teflon rate high) Proper clean-
ing of all insulating surfaces to remove fluxes and
other residues is also required This includes the
IC package as well as sockets and printed circuit
boards When operating in high humidity envi-
ronments or near 0 C some form of surface coat-
ing may be necessary to provide a moisture barri-
er
The effects of board leakage can be minimized by
encircling the input circuitry with a conductive
guard ring operated at a potential close to that of
the inputs
Electrostatic shielding of high impedance circuit-
ry is advisable
Error voltages can also be generated in the exter-
nal circuitry Thermocouples formed between dis-
similar metals can cause hundreds of microvolts
of error in the presence of temperature gradients
Since the ELH0101 can deliver large output cur-
rents careful attention should be paid to power
supply power supply bypassing and load cur-
rents Incorrect grounding of signal inputs and
load can cause significant errors
9
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