Datasheet

PACKAGE CONSIDERATIONS
3
0
-3
-6
-9
-12
-15
-18
Frequency(MHz)
NormalizedGain(dB)
0 200 400 600 800 1000
A =40V/V
VMAX
A =20V/V
VMAX
A =10V/V
VMAX
A =5V/V
VMAX
A =2V/V
VMAX
50W
R
F
50W
V
G
V
IN
50W
Source
R
G
50W
Load
V
OUT
R
1
R
2
R
3
+V
IN
-V
IN
R
G-
R
G+
3
0
-3
-6
-9
-12
-15
-18
Frequency(MHz)
NormalizedGain(dB)
0 200 400 600 800 1000
A =40V/V
VMAX
A =20V/V
VMAX
A =10V/V
VMAX
A =5V/V
VMAX
A =2V/V
VMAX
VCA821
www.ti.com ....................................................................................................................................... SBOS407B – DECEMBER 2007 – REVISED DECEMBER 2008
There are no differences between the packages in
the recommended values for the gain and feedback
The VCA821 is available in both SO-14 and
resistors. However, the bandwidth for the
MSOP-10 packages. Each package has, for the
VCA821IDGS (MSOP-10 package) is lower than the
different gains used in the typical characteristics,
bandwidth for the VCA821ID (SO-14 package). This
different values of R
F
and R
G
in order to achieve the
difference is true for all gains, but especially true for
same performance detailed in the Electrical
gains greater than 5V/V, as can be seen in Figure 83
Characteristics table.
and Figure 84 . Note that the scale must be changed
Figure 82 shows a test gain circuit for the VCA821. to a linear scale to view the details.
Table 2 lists the recommended configuration for the
SO-14 and MSOP-10 packages.
Figure 83. SO-14 Recommended R
F
and R
G
versus A
VMAX
Figure 82. Test Circuit
Table 2. SO-14 and MSOP-10 R
F
and R
G
Configurations
G = 2 G = 10 G = 40
R
F
453 Ω 402 Ω 402 Ω
R
G
453 Ω 80 Ω 18 Ω
Figure 84. MSOP-10 Recommended R
F
and R
G
versus A
VMAX
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