Advance Data Sheet
The dynamic power is focused primarily within the output
stage driving the load. This value can be calculated as:
P
DYNAMIC
= (V
S+
- V
LOAD
)
RMS
× ( I
LOAD
)
RMS
Assuming the load is referenced in the middle of the pow-
er rails or V
supply
/2.
Figure 4 shows the maximum safe power dissipation in
the package vs. the ambient temperature for the pack-
ages available.
and possible unstable behavior. Use a series resistance, R
S
,
between the amplifier and the load to help improve stability
and settling performance. Refer to Figure 6.
Input
+
-
R
f
R
g
R
s
C
L
R
L
Output
C
omlinear
CLC1011, CLC2011, CLC4011
Low Power, Low Cost, Rail-to-Rail I/O Amplifiers
Figure 6. Addition of R
S
for Driving
Capacitive Loads
Table 1 provides the recommended R
S
for various capaci-
tive loads. The recommended R
S
values result in approxi-
mately <1dB peaking in the frequency response. The Fre-
quency Response vs. C
L
plot, on page 6, illustrates the
response of the CLCx011.
C
L
(pF)
10pF
20pF
50pF
R
S
(Ω)
0
0
0
100
-3dB BW (kHz)
2.2
2.4
2.5
2
Figure 4. Maximum Power Derating
100pF
Input Common Mode Voltage
The common mode input range extends to 250mV below
ground and to 250mV above Vs, in single supply opera-
tion. Exceeding these values will not cause phase reversal.
However, if the input voltage exceeds the rails by more
than 0.5V, the input ESD devices will begin to conduct. The
output will stay at the rail during this overdrive condition.
If the absolute maximum input voltage (700mV beyond ei-
ther rail) is exceeded, externally limit the input current to
±5mA as shown in Figure 5.
10k
Input
Output
Table 1: Recommended R
S
vs. C
L
For a given load capacitance, adjust R
S
to optimize the
tradeoff between settling time and bandwidth. In general,
reducing R
S
will increase bandwidth at the expense of ad-
ditional overshoot and ringing.
Overdrive Recovery
An overdrive condition is defined as the point when ei-
ther one of the inputs or the output exceed their specified
voltage range. Overdrive recovery is the time needed for
the amplifier to return to its normal or linear operating
point. The recovery time varies, based on whether the
input or output is overdriven and by how much the range
is exceeded. The CLCx011 will typically recover in less
than 50ns from an overdrive condition. Figure 7 shows the
CLC1011 in an overdriven condition.
Figure 5. Circuit for Input Current Protection
Rev 0.0.1
Driving Capacitive Loads
Increased phase delay at the output due to capacitive load-
ing can cause ringing, peaking in the frequency response,
©2009 CADEKA Microcircuits LLC
www.cadeka.com
10
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
