THS4522IPW datasheet(30/71 Pages) TI2

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0.1

100

1000

Frequency (MHz)

SMALL-SIGNAL FREQUENCY RESPONSE

Device and Package Option Comparison

= 5.0 V

Gain = 1 V/V

S+

R = 1 k

THS4522,

THS4524

THS4521

MSOP

THS4521

SOIC

–

0.1

100

1000

Frequency (MHz)

SMALL-SIGNAL FREQUENCY RESPONSE

Gain = 1, R = R = R = 1 k

and 10 k

1 k

10 k

= 5.0 V

V = 100 mV

Gain = 1 V/V

S+

THS4521, THS4522, THS4524

SBOS458H – DECEMBER 2008 – REVISED JUNE 2015

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8.3.8 Low-Power Applications and the Effects of Resistor Values on Bandwidth

For low-power operation, it may be necessary to increase the gain setting resistors values to limit current

consumption and not load the source. Using larger value resistors lowers the bandwidth of the THS4521,

THS4522, and THS4524 family as a result of the interactions between the resistors, the device parasitic

capacitance, and printed circuit board (PCB) parasitic capacitance. Figure 62 shows the small-signal frequency

response with 1-k

Ω and 10-kΩ resistors for RF, RG, and RL (impedance is assumed to typically increase for all

three resistors in low-power applications).

Figure 62. THS4521 Frequency Response With Various Gain Setting and Load Resistor Values

8.3.9 Frequency Response Variation due to Package Options

Users can see variations in the small-signal (VOUT = 100 mVPP) frequency response between the available

package options for the THS4521, THS4522, and THS4524 family as a result of parasitic elements associated

with each package and board layout changes. Figure 63 shows the variance measured in the lab; this variance is

to be expected even when using a good layout.

Figure 63. Small-Signal Frequency Response: Package Variations

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