Datasheet

0.1
1 10 100 1000
CAPACITANCE (nF)
0.1
1
10
1000
10000
SLEW RATE (V/Ps)
100
LMH6321
www.ti.com SNOSAL8C –APRIL 2006–REVISED MARCH 2013
and rapidly changing output voltages will require large output load currents. For example if the part is required to
slew at 1000 V/μs with a load capacitance of 1 nF the current demand from the LMH6321 would be 1A.
Therefore, fast slew rate is incompatible with large C
L
. Also, since C
L
is in parallel with the load, the peak current
available to the load decreases as C
L
increases.
Figure 58 illustrates the effect of the load capacitance on slew rate. Slew rate tests are specified for resistive
loads and/or very small capacitive loads, otherwise the slew rate test would be a measure of the available output
current. For the highest slew rate, it is obvious that stray load capacitance should be minimized. Peak output
current should be kept below 500 mA. This translates to a maximum stray capacitance of 500 pF for a slew rate
of 1000 V/μs.
Figure 58. Slew Rate vs. Load Capacitance
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