LMH6702 Datasheet, PDF (13/25 Pages) National Semiconductor (TI) – Ultra Low Distortion, Wideband Op Amp

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8 Application and Implementation
LMH6702
SNOSA03H – NOVEMBER 2002 – REVISED MAY 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LMH6702 achieves its excellent pulse and distortion performance by using the current feedback topology.
The loop gain for a current feedback op amp, and hence the frequency response, is predominantly set by the
feedback resistor value. The LMH6702 is optimized for use with a 237-Ω feedback resistor. Using lower values
can lead to excessive ringing in the pulse response while a higher value will limit the bandwidth.
8.2 Typical Application
8.2.1 Feedback Resistor
The LMH6702 achieves its excellent pulse and distortion performance by using the current feedback topology.
The loop gain for a current feedback op amp, and hence the frequency response, is predominantly set by the
feedback resistor value. The LMH6702 is optimized for use with a 237-Ω feedback resistor. Using lower values
can lead to excessive ringing in the pulse response while a higher value will limit the bandwidth.
+5V _6.8µF
V_IN
R_IN
.01µF
A_V = 1 +R_F/R_G = V_OUT/V_IN
C_SS
0.1µF
3
7 ^CPOS
+
6
LMH6702
-
2 ₄ C_NEG
.01µF ^RF
V_OUT
R_G
6.8µF
-5V
Figure 24. Recommended Non-Inverting Gain Circuit
+5V
6.8µF
C_SS
25: _0.1µF
V_IN
R_G
.01µF _{AV =}
3
7 ^CPOS
+
6
LMH6702
-
2 ₄ C_NEG
R_F V_OUT
R_G ⁼ V_IN
V_OUT
.01µF ^RF
R_T
6.8µF
SELECT R_T TO
YIELD DESIRED
-5V
R_IN = R_T||R_G
Figure 25. Recommended Inverting Gain Circuit
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