lm7322mmx National Semiconductor Corporation, lm7322mmx Datasheet - Page 18

• Manufacturer Part Number: lm7322mmx
• Description: Lm7321 Single/ Lm7322 Dual Rail-to-rail Input/output, ?15v, High Output Current And Unlimited Capacitive Load Operational Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
FIGURE 5. Output Short Circuit Sinking Current vs. Input
Figure 6 shows the output voltage, output current, and the
resulting input overdrive with the device set for A
the input tied to a 1 V
As can be seen, during the output transition, the input over-
drive reaches 1V peak and is more than enough to cause the
output current to increase to its maximum value (see Figure
4 and Figure 5 plots). Note that because of the larger output
sinking current compared to the sourcing one, the output neg-
ative transition is faster than the positive one.
FIGURE 4. Output Short Circuit Sourcing Current vs.
PP
Input Overdrive
step function driving a 47 nF capacitor.
Overdrive
V
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= +1 and
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ESTIMATING THE OUTPUT VOLTAGE SWING
It is important to keep in mind that the steady state output
current will be less than the current available when there is
an input overdrive present. For steady state conditions, the
Output Voltage vs. Output Current plot (Typical Performance
Characteristics section) can be used to predict the output
swing. Figure 7 and Figure 8 show this performance along
with several load lines corresponding to loads tied between
the output and ground. In each cases, the intersection of the
device plot at the appropriate temperature with the load line
would be the typical output swing possible for that load. For
example, a 1 kΩ load can accommodate an output swing to
within 250 mV of V
sponding to a typical 29.3 V
FIGURE 7. Output Sourcing Characteristics with Load
FIGURE 6. Buffer Amplifier Scope Photo
−
and to 330 mV of V
Lines
PP
unclipped swing.
+
(V
S
= ±15V) corre-
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