Datasheet

Equalizer Output Offset

The Equalizer Output Offset control shows the current value of the LMH0387 equalizer

output common mode voltage and allows adjustment in 200 mV increments from 1.05V

to 1.85V. At the “Max” setting, the outputs are referenced to the positive supply and the

output common mode is 2.1V. The default setting is 1.25V. The Equalizer Output Offset

may be set either by clicking on the “+” or “-” buttons, or by grabbing and spinning the

“handle” on the knob for a quick adjustment.

Equalizer Output Mute

The Equalizer Output Mute indicator shows the mute status, and the button may be used to

toggle the mute function. The indicator is GREEN to indicate mute (equalizer outputs are

muted) and OFF to indicate normal mode (outputs are not muted).

Extended 3G Reach Mode

The Extended 3G Reach Mode indicator shows the status of the Extended 3G Reach

Mode register bit, and the button may be used to toggle this register bit. The indicator is

GREEN when the bit is set for extended 3G reach mode, and OFF when the equalizer is

set for normal mode. Note that the indicator shows the status of the register bit – not

whether the device is actually in extended 3G reach mode or not. If extended 3G reach

mode is set, the equalizer will remain in this mode until the input cable is physically

changed or power is cycled. For example, extended 3G reach mode is forced, and then it is turned off. The

indicator will show it is off, but the equalizer will still be in extended 3G reach mode until the input cable is changed

or the device power is cycled. The GUI provides a simple way to reset the extended 3G reach mode: the Extended

3G Reach Mode Reset button. This button toggles the equalizer sleep mode, and has a similar effect to removing

and re-applying the input cable.

SD387EVK User Guide 10 of 23