THS4302 datasheet(13/23 Pages) TI

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APPLICATION INFORMATION

High-Speed Operational amplifiers

Applications Section Contents

THS4302

100

Ω

49.9

Ω

µF

47 pF

0.1

µF

VS+

50-

Ω Source

µF

47 pF

0.1

µF

VS−

30.1

Ω

30.1

Ω

FB = Ferrite Bead

THS4302

SLOS403G – OCTOBER 2002 – REVISED JANUARY 2005

generator. The 50-

Ω series resistor at the V

O terminal

in addition to the 50-

Ω load impedance of the test

equipment, provides a 100-

Ω load. The total 100-Ω

The THS4302 fixed-gain operational amplifier set new

load at the output, combined with the 250-

Ω total

performance levels, combining low distortion, high

feedback network load, presents the THS4302 with

slew rates, low noise, and a gain bandwidth in excess

an effective output load of 71

Ω for the circuit of

of 2 GHz. To achieve the full performance of the

Figure 44.

amplifier,

careful

attention

must

paid

printed-circuit board layout and component selection.

INTERNAL FIXED RESISTOR VALUES

In addition, the devices provide a power-down mode

DEVICE

GAIN (V/V)

with the ability to save power when the amplifier is

THS4302

200

inactive.

•

Wideband, Noninverting Operation

•

Single Supply Operation

•

Saving Power With Power-Down Functionality

•

Driving an ADC With the THS4302

•

Driving Capacitive Loads

•

Power

Supply

Decoupling

Techniques

and

Recommendations

•

Board Layout

•

Printed-Circuit

Board

Layout

Techniques

for

Optimal Performance

•

PowerPAD Design Considerations

•

PowerPAD PCB Layout Considerations

•

Thermal Analysis

•

Design Tools

•

Evaluation

Fixtures

and

Application

Support

Information

Figure 44. Wideband, Noninverting

•

Additional Reference Material

Gain Configuration

•

Mechanical Package Drawings

SINGLE SUPPLY OPERATION

WIDEBAND, NONINVERTING OPERATION

The THS4302 is designed to operate from a single

The THS4302 is a fixed-gain voltage feedback oper-

3-V to 5-V power supply. When operating from a

ational

amplifier,

with

power-down

capability,

single power supply, care must be taken to ensure

designed to operate from a single 3-V to 5-V power

the input signal and amplifier are biased appropriately

supply.

to allow for the maximum output voltage swing. The

Figure 44 is the noninverting gain configuration used

circuits shown in Figure 45 demonstrate methods to

to demonstrate the typical performance curves. Most

configure an amplifier in a manner conducive for

of the curves were characterized using signal sources

single supply operation.

with 50-

Ω source impedance, and with measurement

equipment presenting a 50-

Ω load impedance. In

Figure 44, the 49.9-

Ω shunt resistor at the V

terminal matches the source impedance of the test

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