THS3121CDR datasheet(15/28 Pages) TI

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APPLICATION INFORMATION

Maximum Slew Rate for Repetitive Signals

WIDEBAND, NONINVERTING OPERATION

THS3120

649

Ω

49.9

Ω

0.1

µF

6.8

µF

-VS

-15 V

Ω Source

0.1

µF

6.8

µF

+VS

15 V

649

Ω

49.9

Ω

Ω LOAD

THS3120, THS3121

SLOS420A – SEPTEMBER 2003 – REVISED NOVEMBER 2003

Current-feedback amplifiers are highly dependent on

the feedback resistor RF for maximum performance

The THS3120 and THS3121 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 maxi-

nodes of the amplifier have time to stabilize between

mum bandwidth with minimal peaking in the fre-

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

quency

response.

Higher

bandwidths

can

delay between pulses.

achieved, at the expense of added peaking in the

The THS3120 and THS3121 are not recommended

frequency response, by using even lower values for

for applications with repetitive signals (sine, square,

RF.

Conversely,

increasing

decreases

the

sawtooth, or other) that exceed 900 V/

µs. Using the

bandwidth, but stability is improved.

part in these applications results in excessive current

draw from the power supply and possible device

Table 1. Recommended Resistor Values for

damage.

Optimum Frequency Response

THS3120 and THS3121 RF and RG values for minimal peaking

For applications with high slew rate, repetitive signals,

with RL = 50 Ω

the THS3091 and THS3095 (single), or THS3092 and

SUPPLY VOLTAGE

THS3096 (dual) are recommended.

GAIN (V/V)

RG (Ω)

RF (Ω)

(V)

±15

806

±5

909

The THS3120 and THS3121 are unity gain stable

±15

649

130-MHz current-feedback operational amplifiers, de-

±5

750

signed to operate from a

±5-V to ±15-V power supply.

±15

124

499

Figure 45 shows the THS3121 in a noninverting gain

±5

124

499

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

performance

curves.

Most

the

curves

were

±15

33.2

301

characterized using signal sources with 50-

Ω source

±5

33.2

301

impedance, and with measurement equipment pres-

±15

681

enting a 50-

Ω load impedance.

-1

±5

750

-2

±15 and ±5

340

681

-5

±15 and ±5

100

499

-10

±15 and ±5

36.5

365

Figure 45. Wideband, Noninverting Gain

Configuration

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