Time: 56 ps /div

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LMH0344

SNLS233O – APRIL 2007 – REVISED JULY 2015

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Typical Application (continued)

8.2.1 Design Requirements

Table 1 lists the design parameters for the LMH0344.

Table 1. LMH0344 Design Parameters

DESIGN PARAMETER

REQUIREMENT

Required. A common type of AC-coupling capacitor is

1 µF ±10% X7R ceramic capacitor (0402 or 0201

Input AC-coupling capacitors

size). Capacitors may be implemented on the PCB or

in the connector.

The user should check input common mode voltage of

the device attached to SDO . If AC-coupling Capacitor

Output AC-coupling capacitors

is required, AC-coupling capacitor is expected to be

4.7 µF ±10%.

Refer to DC Electrical Characteristics and AC

Input launch amplitude

Electrical Characteristics.

8.2.2 Detailed Design Procedure

To begin the design process, determine the following:

1. Maximum power draw for PCB regulator selection. Use maximum power consumption in the data sheet.

2. Closely compare schematic against typical connection diagram in the data sheet.

3. Plan out the PCB layout and component placement to minimize parasitic losses and reflections.

4. To optimize return loss result, return loss components may need to be adjusted.

8.2.3 Application Curves

Figure 4 and Figure 5 depict the differential output eye diagrams for SDO and SDO at 2.97 Gbps using B1694A

cable.

Figure 5. Serial Data Output After Equalizing 10m of

Figure 4. Serial Data Output After Equalizing 100m of

Belden 1694A 2.97-Gbps PRBS10

Belden 1694A 2.97-Gbps PRBS10

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