LMH0344

SNLS233O – APRIL 2007 – REVISED JULY 2015

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Feature Description (continued)

The mute reference sets the threshold for CD and (with CD tied to MUTE) determines the amount of cable to

equalize before automatically muting the outputs. This is set by applying a voltage inversely proportional to the

unconnected or connected to ground for maximum equalization before muting.

7.3.3 Carrier Detect (CD) and Mute

detect threshold will be altered accordingly. CD provides a high voltage when no signal is present at the

LMH0344 input. CD is low when a valid input signal is detected.

MUTE can be used to manually mute or enable SDO and SDO. Applying a high input to MUTE will mute the

LMH0344 outputs by forcing the output to a logic zero. Applying a low input will force the outputs to be active.

CD and MUTE may be tied together to automatically mute the output when no input signal is present.

7.3.4 Input Interfacing

The LMH0344 accepts either differential or single-ended input. The input must be AC-coupled. Transformer

coupling is not supported.

The LMH0344 correctly handles equalizer pathological signals for standard definition and high definition serial

digital video, as described in SMPTE RP 178 and RP 198, respectively.

7.3.5 Output Interfacing

The SDO and SDO outputs are internally loaded with 50

7.4 Device Functional Modes

The LMH0344 features can be programmed using pin mode only.

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