25 ns/DIV

V

+

= +2.5V

V

-

= -2.5V

LMH6611, LMH6612

www.ti.com

SNOSB00K – NOVEMBER 2007 – REVISED OCTOBER 2013

APPLICATION INFORMATION

The LMH6611 and LMH6612 are based on proprietary VIP10 dielectrically isolated bipolar process. This device

family architecture features the following:

•

low bias current.

•

Common emitter push-push output stage. This architecture allows the output to reach within millivolts of either

supply rail.

•

Consistent performance with little variation from any supply voltage (2.7V - 11V) for the most important

•

Significant power saving compared to competitive devices on the market with similar performance.

With 3V supplies and a common mode input voltage range that extends beyond either supply rail, the LMH6611

is well suited to many low voltage/low power applications. Even with 3V supplies, the

typically 305 MHz.

The LMH6611 and LMH6612 are designed to avoid output phase reversal. With input overdrive, the output is

kept near the supply rail (or as close to it as mandated by the closed loop gain setting and the input voltage).

Figure 66 shows the input and output voltage when the input voltage significantly exceeds the supply voltages.

Figure 66. Input and Output Shown with CMVR Exceeded

If the input voltage range is exceeded by more than a diode drop beyond either rail, the internal ESD protection

diodes will start to conduct. The current flow in these ESD diodes should be externally limited.

SHUTDOWN CAPABILITY AND TURN ON/OFF BEHAVIOR

The LMH6611 can be shutdown by connecting the DISABLE pin to a voltage 0.5V below the supply midpoint

which will reduce the supply current to typically 120 µA. The DISABLE pin is “active low” and can be connected

below the supply midpoint at any operating supply voltage and temperature. Typical turn on time is 20 ns and the

turn off time is 60 ns.

In the shutdown mode, essentially all internal device biasing is turned off in order to minimize supply current flow

and the output goes into high impedance mode. During shutdown, the input stage has an equivalent circuit as

shown in Figure 67.

Copyright © 2007–2013, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Links: LMH6611 LMH6612