clc4600iso14x Cadeka Microcircuits LLC., clc4600iso14x Datasheet - Page 11

• Manufacturer Part Number: clc4600iso14x
• Description: Dual, Triple, And Quad 300mhz Amplifers
• Manufacturer: Cadeka Microcircuits LLC.

Data Sheet
Driving Capacitive Loads
Increased phase delay at the output due to capacitive load-
ing can cause ringing, peaking in the frequency response,
and possible unstable behavior. Use a series resistance,
R
stability and settling performance. Refer to Figure 6.
Table 2 provides the recommended R
tive loads. The recommended R
peaking in the frequency response. The Frequency Re-
sponse vs. C
the CLCx600 Family.
For a given load capacitance, adjust R
tradeoff between settling time and bandwidth. In general,
reducing R
ditional overshoot and ringing.
Parasitic Capacitance on the Inverting Input
Physical connections between components create unin-
tentional or parasitic resistive, capacitive, and inductive
elements.
Parasitic capacitance at the inverting input can be espe-
cially troublesome with high frequency amplifiers. A para-
sitic capacitance on this node will be in parallel with the
gain setting resistor R
ance can begin to raise the system gain by making R
appear smaller.
In general, avoid adding any additional parasitic capaci-
tance at this node. In addition, stray capacitance across
the R
©2004-2008 CADEKA Microcircuits LLC
S
Input
, between the amplifier and the load to help improve
C
L
100
f
10
50
(pF)
resistor can induce peaking and high frequency
R
g
S
Figure 6. Addition of R
+
Table 1: Recommended R
-
will increase bandwidth at the expense of ad-
L
plot, on page 5, illustrates the response of
R
f
R
Capacitive Loads
S
40
30
20
(Ω)
g
. At high frequencies, its imped-
R
s
C
S
L
values result in <=0.5dB
-3dB BW (MHz)
S
for Driving
R
S
L
S
265
140
105
for various capaci-
vs. C
S
Output
to optimize the
L
g
ringing. Refer to the layout considerations section for
additional information regarding high speed layout tech-
niques.
Overdrive Recovery
An overdrive condition is defined as the point when either
one of the inputs or the output exceed their specified volt-
age 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 ex-
ceeded. The CLCx600 Family will typically recover in less
than 10ns from an overdrive condition. Figure 7 shows the
CLC2600 in an overdriven condition.
Power Dissipation
For most applications, the power dissipation due to driv-
ing external loads should be low enough to ensure a safe
operating condition. However, applications with low im-
pedance, DC coupled loads should be analyzed to en-
sure that maximum allowed junction temperature is not
exceeded. Guidelines listed below can be used to verify
that the particular application will not cause the device to
operate beyond it’s intended operating range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction tem-
perature, the package thermal resistance value Theta
(Ө
T
Where T
Junction
JA
-0.25
-0.50
-0.75
-1.00
1.00
0.75
0.50
0.25
0.00
) is used along with the total die power dissipation.
0
Ambient
= T
Input
20
Ambient
Figure 7. Overdrive Recovery
is the temperature of the working environment.
40
60
+ (Ө
Output
80
JA
Time (ns)
× P
100
D
120
)
140
V
G = 5
160
IN
www.cadeka.com
= 1.5V
180
pp
200
4
3
2
1
0
-1
-2
-3
-4
11
JA