THS4521 datasheet(27/43 Pages) TI

27 / 43 page

Low-Power Applications and the Effects of

Frequency Response Variation due to

0.1

100

1000

Frequency(MHz)

SMALL-SIGNALFREQUENCYRESPONSE

DeviceandPackageOptionComparison

=5.0V

Gain=1V/V

S+

R =1k

THS4522,

THS4524

THS4521

MSOP

THS4521

SOIC

0.1

100

1000

Frequency(MHz)

SMALL-SIGNALFREQUENCYRESPONSE

Gain=1,R =R =R =1k ,10k ,100k

1kW

10kW

100kW

=5.0V

V =100mV

Gain=1V/V

S+

THS4521

THS4522

THS4524

www.ti.com.................................................................................................................................................... SBOS458B – DECEMBER 2008 – REVISED MAY 2009

Resistor Values on Bandwidth

Package Options

For low-power operation, it may be necessary to

Users can see variations in the small-signal (VOUT =

increase the gain setting resistors values to limit

100 mVPP) 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

shows

the

using a good layout.

small-signal frequency response with 1-k

Ω, 10-kΩ,

and 100-k

Ω resistors for RF, RG, and RL (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

space

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