8.2 Typical Application
Figure 5 shows the application circuit for the LMH0303.
SNLS285H – APRIL 2008 – REVISED MAY 2016
4.7 μF Coaxial Cable
4.7 μF Coaxial Cable 75 Ω
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Figure 5. Application Circuit
8.2.1 Design Requirements
For the LMH0303 design example, Table 2 lists the design parameters.
Table 2. LMH0303 Design Parameters
Output AC-coupling capacitors
DC power supply coupling capacitors
Distance from device to BNC
High speed SDI and SDI trace impedance
High speed SDO and SDO trace impedance
Required, 49.9 Ω are recommended (see Figure 5).
Required. Both SDO and SDO require AC-coupling capacitors. SDO AC-
coupling capacitors are expected to be 4.7 µF to comply with SMPTE
To minimize power supply noise, place 0.1-µF capacitor as close to the
device VCC pin as possible.
Keep this distance as short as possible.
Design differential trace impedance of SDI and SDI with 100 Ω.
Single-ended trace impedance for SDO and SDO with 75 Ω.
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Product Folder Links: LMH0303
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