Datasheet

V
OUT
+
-
+5V
-5V
C
POS
6.8 µF
0.01 µF
6.8 µF
C
NEG
0.01 µF
0.1 µF
C
SS
R
IN
V
IN
V
OUT
+
-
V
IN
+5V
-5V
C
POS
6.8 µF
0.01 µF
6.8 µF
C
NEG
0.01 µF
R
IN
0.1 µF
C
SS
V
OUT
+
-
V
IN
+5V
-5V
C
POS
6.8 µF
0.01 µF
6.8 µF
C
NEG
0.01 µF
R
IN
0.1 µF
C
SS
NC
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 R
F
= R
G
= 450Ω. As such it can be configured with an
A
V
= +2, A
V
= +1, or an A
V
= −1 by connecting pins 3 and 4 as described in Table 1.
Table 1. Input Connections for all 3 Gain Possibilities
INPUT CONNECTIONS
GAIN A
V
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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