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LF400MH Arkusz danych(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części LF400MH
Szczegółowy opis  Fast-Settling JFET-Input Operational Amplifier
Download  12 Pages
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

LF400MH Arkusz danych(HTML) 10 Page - National Semiconductor (TI)

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Application Hints (Continued)
TLH9414 – 21
FIGURE 1 Simplified Settling Time Test Circuit (see Text)
CL
s 49 pF
tling time testing must be able to drive 50
X with a very clean
g5V square wave For more information on measuring set-
tling time see Application Note AN-428
Output Compensation
When operating at very low temperatures a compensation
network should be added to the LF400’s output The 100
X
22 pF network shown on the first page of this data sheet
should be used when the junction temperature might reach
25 C (roughly 0 C ambient when the LF400 is ‘‘warmed
up’’) In applications where the device will be operating with
a junction temperature near 0 C the output RLC network in
Figure 1 should be used This network will provide a small
(about 20 ns) improvement in settling time at higher temper-
atures as well
Supply Bypassing
Power supply bypassing is extremely important for good
high-speed performance Ideally multiple bypass capacitors
as in
Figure 2 should be used A 10
mF tantalum a 22 mF
ceramic and a 047
mF ceramic work well All bypass ca-
pacitor leads should be very short For best results the
ground leads of the capacitors should be separated to re-
duce the inductance to ground A ground plane layout ap-
proach will give the best results For simplicity bypass ca-
pacitors have been omitted from some of the schematics in
this data sheet but they should always be used
TLH9414 – 22
FIGURE 2 Power Supply Bypassing (see Text)
Output Drive and Current Limit
The LF400 can drive heavier resistive loads than most oper-
ational amplifiers The output at pin 6 is internally current-
limited when the voltage drop across the 25
X output resis-
tor reaches about 055V (IOUT e 22 mA) When more out-
put current is needed pin 8 provides a means of increasing
the maximum output current up to about 100 mA A resistor
may be connected from pin 8 to pin 6 paralleling the inter-
nal sense resistor and increasing the current limit threshold
(
Figure 3 ) Pins 6 and 8 may be shorted together to com-
pletely bypass the current limiting circuit To avoid damaging
the LF400 observe the power dissipation limitations men-
tioned in the Absolute Maximum Ratings and in Note 4
The effective load impedance (including feedback resist-
ance) should be kept above 500
X for fastest settling Load
capacitance should also be minimized if good settling time
is to be optimized Large feedback resistors will make the
circuit more susceptible to stray capacitance so in high-
speed applications keep the feedback resistors in the 1 k
X
to2k
X range wherever practical Avoid the use of inductive
feedback resistors (some wirewounds for example) as these
will degrade settling time
ILimit
055V
Rx 25X
TLH9414 – 23
FIGURE 3 Increasing the current limit using pin 8
Current limit is now determined by RX in parallel with
the internal 25
X sense resistor
Vos Adjustment
Offset voltage can be nulled using a 27k resistor and a 10k
potentiometer connected to pins 1 and 5 as shown in
Figure
4a Bypassing the Vos adjust pins with 01 mF capacitors will
help to avoid noise pickup When not used for offset adjust-
ment pins 1 and 5 can often be left open but to minimize
the possibility of noise pickup the unused Vos trim pins
should be connected to ground or V
b
10


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