TUSB551

SLLSEJ1A – MARCH 2014 – REVISED MARCH 2014

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Typical Application (continued)

The TUSB551 is placed in the receiver channel and connected to a USB3 Type-A connector. This example

shows the polarity matched, and the TUSB551 footprint is rotated so the trace routing of the differential pairs will

not overlap. The EQ and DE terminals must be pulled up, pulled down, or left floating depending on the amount

of equalization or de-emphasis that is desired. The OS terminal must be pulled down or left floating depending

on the required output swing. In this example, the EQ and OS terminals are left floating and the DE terminal is

pulled up through a resistor.

Figure 13. Receive Channel Implementation

9.2.1.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Input Voltage Range

100 mV to 1200 mV

Output Voltage Range

1050 mV to 1200 mV

Equalization

3, 6, 9 dB

De-Emphasis

0, –3.5, –6 dB (OS Floating)

VCC

1.8 V nominal supply

9.2.1.2 Detailed Design Procedure

To begin the design process, determine the following:

•

Equalization (EQ) setting

•

De-Emphasis (DE) setting

•

Output Swing Amplitude (OS) setting

The equalization should be set based on the insertion loss in the pre-channel (channel before the TUSB551

device). The input voltage to the device is able to have a large range because of the receiver sensitivity and the

available EQ settings. The EQ terminal can be pulled high through a resistor to VCC, low through a resistor to

ground, or left floating. The application schematic above shows the implementation. See Device Functional

Modes section for EQ values.

The De-Emphasis setting should be set based on the length and characteristics of the post channel (channel

after the TUSB551 device). Output de-emphasis can be tailored using the DE terminal. This terminal should be

pulled high through a resistor to VCC, low through a resistor to ground, or left floating. The application schematic

above shows the implementation. See Device Functional Modes section for DE values.

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