4

3

2

7

6

LMH6702

+

-

+5V

-5V

6.8µF

.01µF

6.8µF

.01µF

25:

0.1µF

YIELD DESIRED

=

4

3

2

7

6

LMH6702

+

-

+5V

-5V

6.8µF

.01µF

6.8µF

.01µF

0.1µF

LMH6702QML

SNOSAQ2E – JULY 2005 – REVISED MARCH 2013

www.ti.com

APPLICATION SECTION

FEEDBACK RESISTOR

Figure 21. Recommended Non-Inverting Gain Circuit

Figure 22. Recommended Inverting Gain Circuit

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. Application Note

HARMONIC DISTORTION

The LMH6702 has been optimized for exceptionally low harmonic distortion while driving very demanding

resistive or capacitive loads. Generally, when used as the input amplifier to very high speed flash ADCs, the

For absolute minimum distortion levels, it is also advisable to keep the supply decoupling currents (ground

separately routing the high frequency current spikes on the decoupling caps back to the power supply (similar to

"Star Connection" layout technique) ensures minimum coupling back to the input circuitry and results in best

8

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