LMH0394_15 Datasheet, PDF (25/35 Pages) Texas Instruments – 3G HD/SD SDI Low Power Extended Reach Adaptive Cable Equalizer

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LMH0394
SNLS312M – AUGUST 2010 – REVISED JULY 2015
8.3 Do's and Dont's
Pay special attention to the PCB layout for the high-speed signals. SMPTE specifies the requirements for the
Serial Digital Interface to transport digital video at SD, HD, and 3 Gbps data rates over coaxial cables. One of the
requirements is meeting the required Return Loss. This requirement specifies how closely the port resembles 75-
Ω impedance across a specified frequency band. The SMPTE specifications also defines the use of AC coupling
capacitors for transporting uncompressed serial data streams with heavy low frequency content. This
specification requires the use of a 1-µF AC coupling capacitor on the input of the LMH0394 to avoid low
frequency bandwidth limitation.
9 Power Supply Recommendations
Follow these general guidelines when designing the power supply:
1. The power supply must be designed to provide the recommended operating conditions in terms of DC
voltage and maximum current consumption.
2. The maximum current draw for the LMH0394 is provided in the data sheet. This number can be used to
calculate the maximum current the supply must provide.
3. The LMH0394 does not require any special power supply filtering, provided the recommended operating
conditions are met. Use 0.01-µF capacitors as close to the device VDD pins as possible.
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