Datasheet

V
OUT
FROM V
+
(V)
10µ 100µ
1m 10m
I
OUT
(A)
10m
100m
1
10
100m
V
S
= 10V
V
ID
= 20 mV
20:
100:
50:
200:
2 k:
600:
1 k:
10p
1n 100n 10µ
C
L
(pF)
100n
1µ
10µ
100µ
±1% SETTLING TIME (S)
1µ10n
100p
SLEW RATE
(
V
/
µS
)
0.1
1
10
100
SETTLING TIME
100 mV
PP
STEP
SLEW RATE
V
S
= 10V
A
V
= +1
LM7332
SNOSAV4A –APRIL 2008–REVISED MARCH 2013 www.ti.com
Output current drive is an important parameter when driving capacitive loads. This parameter will determine how
fast the output voltage can change. Referring to Figure 49, two distinct regions can be identified. Below about
10,000 pF, the output Slew Rate is solely determined by the op amp’s compensation capacitor value and
available current into that capacitor. Beyond 10 nF, the Slew Rate is determined by the op amp’s available output
current. An estimate of positive and negative slew rates for loads larger than 100 nF can be made by dividing the
short circuit current value by the capacitor.
Figure 49. Settling Time and Slew Rate vs. Capacitive Load
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, Figure 50 and Figure 51 plots can be used to
predict the output swing. These plots also show several load lines corresponding to loads tied between the
output and ground. In each case, 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 600Ω load can accommodate an
output swing to within 100 mV of V
−
and to 250 mV of V
+
(V
S
= ±5V) corresponding to a typical 9.65 V
PP
unclipped swing.
Figure 50. Steady State Output Sourcing Characteristics with Load Lines
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