Datasheet
Clamp Overdrive
Recovery Time
Response to step
from clamped state
Normal Linear
response to step
V
Time
50%
+
-
R
F
V
IN
= 2V
PP
0V
R
F
R
G
R
G
V
CM
V
CLAMP
V
CM
= 1.5V
V
clamp
= 2.0V
Differential Output
V
ON
-V
OP
= 2V
PP
1.0
0
1.5
2.5
0.5
t
V
ON_SE
SE Unclampled output
2.0
V
1 V
PP
V
CLAMP
2*V
CM
± V
CLAMP
0
1.5
2.5
0.5
t
V
OP_SE
SE Unclampled output
2.0
1.0
V
1 V
PP
V
CLAMP
2*V
CM
± V
CLAMP
V
CM
=
V
CM
=
LMH6553
www.ti.com
SNOSB07H –SEPTEMBER 2008–REVISED MARCH 2013
Figure 59. Clamp Operation
CLAMP PERFORMANCE
Key clamp performance specifications are listed in the electrical characteristics section. Figure 60 illustrates the
clamp overdrive recovery time which is defined as the difference in input to output propagation delay due to a
step change at the input for a clamped output versus a normal linear unclamped, non-saturated output.
Figure 60. Clamp Overdrive Recovery Time
MAXIMUM OUTPUT LEVEL
The maximum unclamped output swing in normal operation is 4V
PP
single ended or 8 V
PP
differential due to the
requirement that V
CLAMP
< V
CM
+ 2.0V. For split supply operation of +5V and −5V, the maximum output voltage is
limited by the output stage's ability to swing close to either supply (V
OUT
< ±3.7V). As shown in Figure 61, if
V
CLAMP
is set > 3.7V, the amplifier output will saturate at the positive supply before the clamp can operate and
similarly if 2*V
CM
- V
CLAMP
< −3.7V, the amplifier output will saturate at the negative supply.
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