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GAIN (-V/V)

LMH6714, LMH6720

LMH6722, LMH6722-Q1

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SNOSA39G – NOVEMBER 2002 – REVISED APRIL 2013

high, decreases to 200

LMH6714/LMH6720/LMH6722 the output resistance of the input buffer is approximately 180

Ω and 50Ω is a

gain bandwidth limited fashion for gains of ±5V/V or greater.

ACTIVE FILTERS

When using any current feedback Operational Amplifier as an active filter it is important to be very careful when

using reactive components in the feedback loop. Anything that reduces the impedance of the negative feedback,

especially at higher frequencies, will almost certainly cause stability problems. Likewise capacitance on the

inverting input needs to be avoided. See Application Notes OA-07 (SNOA365) and OA-26 (SNOA387) for more

information on Active Filter applications for Current Feedback Op Amps.

Figure 34. Enable/Disable Operation

ENABLE/DISABLE OPERATION USING ±5V SUPPLIES (LMH6720 ONLY)

The LMH6720 has a TTL logic compatible disable function. Apply a logic low (<.8V) to the DS pin and the

LMH6720 is disabled. Apply a logic high (>2.0V), or let the pin float and the LMH6720 is enabled. Voltage, not

current, at the Disable pin determines the enable/disable state. Care must be exercised to prevent the disable pin

single supplies) doing so could cause transistor Q1 to Zener resulting in damage to the disable circuit. The core

amplifier is unaffected by this, but disable operation could become slower as a result.

Copyright © 2002–2013, Texas Instruments Incorporated

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Product Folder Links: LMH6714 LMH6720 LMH6722 LMH6722-Q1