LMH6739 datasheet(9/19 Pages) TI1

9 / 19 page

VOUT

+5V

-5V

CPOS

6.8 µF

0.01 µF

6.8 µF

CNEG

0.01 µF

0.1 µF

CSS

RIN

VIN

VOUT

VIN

+5V

-5V

CPOS

6.8 µF

0.01 µF

6.8 µF

CNEG

0.01 µF

RIN

0.1 µF

CSS

VOUT

VIN

+5V

-5V

CPOS

6.8 µF

0.01 µF

6.8 µF

CNEG

0.01 µF

RIN

0.1 µF

CSS

LMH6739

www.ti.com

SNOSAD2G – MAY 2004 – REVISED MARCH 2013

APPLICATION INFORMATION

Figure 21. Recommended Non-Inverting Gain

Figure 22. Recommended Non-Inverting Gain

Circuit, Gain = +2

Circuit, Gain +1

Figure 23. Recommended Inverting Gain Circuit,

Gain = –1

GENERAL INFORMATION

The LMH6739 is a high speed current feedback selectable gain buffer (SGB), optimized for very high speed and

low distortion. With its internal feedback and gain-setting resistors the LMH6739 offers excellent AC performance

while simplifying board layout and minimizing the affects of layout related parasitic components. The LMH6739

has no internal ground reference so single or split supply configurations are both equally useful.

SETTING THE CLOSED LOOP GAIN

The LMH6739 is a current feedback amplifier with on-chip RF = RG = 450Ω. As such it can be configured with an

AV = +2, AV = +1, or an AV = −1 by connecting pins 3 and 4 as described in Table 1.

Table 1. Input Connections for all 3 Gain Possibilities

INPUT CONNECTIONS

GAIN AV

Non-Inverting

Inverting

−1 V/V

Ground

Input Signal

+1 V/V

Input Signal

NC (Open)

+2 V/V

Input Signal

Ground

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