THS3115IPWPRG4 datasheet(11/35 Pages) TI1

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THS3115

750 W

49.9 W

53.6

750 W

0.1

6.8

0.1

6.8

50-

Load

50-

Source

-V

-15V

+15V

THS3115

750 W

49.9 W

750

0.1

6.8

0.1

6.8

50-

Load

50-

Source

-V

-15V

+15V

THS3112

THS3115

www.ti.com

SLOS385C – SEPTEMBER 2001 – REVISED SEPTEMBER 2010

APPLICATION INFORMATION

Current-feedback amplifiers are highly dependent on

Maximum Slew Rate for Repetitive Signals

the feedback resistor RF for maximum performance

The THS3115 and THS3112 are recommended for

and stability. Table 1 shows the optimal gain setting

high slew rate pulsed applications where the internal

resistors RF and RG at different gains to give

nodes of the amplifier have time to stabilize between

maximum bandwidth with minimal peaking in the

pulses. It is recommended to have at least a 20-ns

frequency response. Higher bandwidths can be

delay between pulses.

achieved, at the expense of added peaking in the

frequency response, by using even lower values for

The THS3115 and THS3112 are not recommended

RF.

Conversely,

increasing

decreases

the

for applications with repetitive signals (sine, square,

bandwidth, but stability is improved.

sawtooth, or other) that exceed 900 V/µs. Using the

part in these applications results in excessive current

Table 1. Recommended Resistor Values for

draw from the power supply and possible device

Optimum Frequency Response

damage.

THS3115 and THS3112 RF and RG VALUES FOR MINIMAL

For applications with high slew rate, repetitive signals,

PEAKING WITH RL = 50 Ω, ±5-V to ±15-V POWER SUPPLY

the THS3091 and THS3095 (single versions), or

GAIN (V/V)

RG (Ω)

RF (Ω)

THS3092

and

THS3096

(dual

versions)

are

—

1 k

recommended.

750

187

560

Wideband, Noninverting Operation

28.7

200

The THS3115 and THS3112 are unity gain stable

–1

750

100-MHz

current-feedback

operational

amplifiers,

designed to operate from a ±5-V to ±15-V power

–4

140

560

supply.

–8

53.6

430

Figure 39 shows the THS3115 in a noninverting gain

of 2-V/V configuration used to generate the typical

Wideband, Inverting Operation

characteristic curves. Most of the curves were

Figure 40 shows the THS3115 in a typical inverting

characterized using signal sources with 50-

Ω source

gain configuration designed for 50-

Ω input/output.

impedance and with measurement equipment that

presents a 50-

Ω load impedance.

Figure 40. Wideband, Inverting Gain

Configuration

Figure 39. Wideband, Noninverting Gain

Configuration

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