Datasheet

6
3
0
3
6
9
12
15
18
21
24
-
-
-
-
-
-
-
-
0.1
1
10 100 1000
Frequency (MHz)
SMALL-SIGNAL FREQUENCY RESPONSE
Device and Package Option Comparison
V = 5.0 V
Gain = 1 V/V
S+
R = 1 k
R = 1 k
F
L
W
W
THS4522,
THS4524
THS4521
MSOP
THS4521
SOIC
Signal Gain (dB)
6
3
0
3
6
9
12
15
18
21
24
-
-
-
-
-
-
-
-
0.1
1
10 100 1000
Frequency (MHz)
SMALL-SIGNAL FREQUENCY RESPONSE
Gain = 1, R = R = R = 1 k , 10 k , 100 k
F G L
W W W
1 kW
10 kW
100 kW
V = 5.0 V
V = 100 mV
Gain = 1 V/V
S+
O PP
Signal Gain (dB)
THS4521
THS4522
THS4524
www.ti.com SBOS458F –DECEMBER 2008–REVISED SEPTEMBER 2011
Low-Power Applications and the Effects of Frequency Response Variation due to
Resistor Values on Bandwidth Package Options
For low-power operation, it may be necessary to Users can see variations in the small-signal (V
OUT
=
increase the gain setting resistors values to limit 100 mV
PP
) frequency response between the available
current consumption and not load the source. Using package options for the THS4521, THS4522, and
larger value resistors lowers the bandwidth of the THS4524 family as a result of parasitic elements
THS4521, THS4522, and THS4524 family as a result associated with each package and board layout
of the interactions between the resistors, the device changes. Figure 65 shows the variance measured in
parasitic capacitance, and printed circuit board (PCB) the lab; this variance is to be expected even when
parasitic capacitance. Figure 64 shows the using a good layout.
small-signal frequency response with 1-kΩ, 10-kΩ,
and 100-kΩ resistors for R
F
, R
G
, and R
L
(impedance
is assumed to typically increase for all three resistors
in low-power applications).
Figure 65. Small-Signal Frequency Response:
Package Variations
Figure 64. THS4521 Frequency Response with
Various Gain Setting and Load Resistor Values
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Product Folder Link(s): THS4521 THS4522 THS4524