ELH0032G/883B 查看數據表（PDF） - Elantec -> Intersil

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ELH0032G/883B

Fast Operational Amplifier

Elantec -> Intersil 

ELH0032G 883 8001301ZX

Fast Operational Amplifier

Applications Information

Power Supply Decoupling

The ELH0032 like most high-speed circuits is

sensitive to layout and stray capacitance Power

supplies should be bypassed as near to pins 10

and 12 as possible with low inductance capacitors

such as 0 01 mF disc ceramics Compensation

components should also be located close to the

appropriate pins to minimize stray reactances

Input Current

Because the input devices are FETs the input

bias current may be expected to double for each

11 C junction temperature rise This characteris-

tic is plotted in the typical performance charac-

teristics graphs The device will self-heat due to

internal power dissipation after application of

power thus raising the FET junction tempera-

ture 40 C – 60 C above the free-air ambient tem-

perature when supplies are g15V The device

temperature will stabilize within 5 –10 minutes

after application of power and the input bias cur-

rents measured at the time will be indicative of

normal operating currents An additional rise will

occur as power is delivered to a load due to addi-

tional internal power dissipation

There is an additional effect on input bias current

as the input voltage is changed The effect com-

mon to all FETs is an avalance-like increase in

gate current as the FET gate-to-drain voltage is

increased above a critical value depending on

FET geometry and doping levels This effect will

be noted as the input voltage of the ELH0032 is

taken below ground potential when the supplies

are g15V All of the effects described here may

be minimized by operating the device with VS s

g15V

These effects are indicated in the typical per-

formance curves

Input Capacitance

The input capacitance to the ELH0032 is typical-

ly 5 pF and thus may form a significant time

constant with high value resistors For optimum

performance the input capacitance to the invert-

ing input should be compensated by a small ca-

pacitor across the feedback resistor The value is

strongly dependent on layout and closed loop

gain but will typically be in the neighborhood of

several picofarads

In the non-inverting configuration it may be ad-

vantageous to bootstrap the case and or a guard

conductor to the inverting input This serves

both to divert leakage currents away from the

non-inverting input and to reduce the effective

input capacitance A unity gain follower so treat-

ed will have an input capacitance under a 1 pF

Heatsinking

While the ELH0032 is specified for operation

without any explicit heatsink internal power dis-

sipation does cause a significant temperature rise

Improved bias current performance can thus be

obtained by limiting this temperature rise with a

small heat sink such as the Thermalloy No 2241

or equivalent The case of the device has no inter-

nal connection so it may be electrically connect-

ed to the sink if this is advantageous Be aware

however that this will affect the stray capaci-

tances to all pins and may thus require adjust-

ment of circuit compensation values

Burn-In Circuit

(Functional Diagram)

0032 – 14

7

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