A

B

C

D

FR4 Trace

of Length Y

FR4 Trace

of Length X

C

USB 3.1

Host

RXP1

TUSB1002A

RXN1

+

-

TXP2

TXN2

+

-

+

-

TXP1

TXN1

+

-

+

-

RXP2

RXN2

+

-

Upstream

C

C

C

C

Downstream

C

C

C

19

TUSB1002A

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Product Folder Links: TUSB1002A

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TUSB1002A is a linear redriver designed specifically to compensation for ISI jitter caused by attenuation

through a passive medium like traces and cables. Because the TUSB1002A has two independent channels, it

can be optimized to correct ISI in both the upstream and downstream direction through 16 different equalization

choices. Placing the TUSB1002A between a USB3.2 Host/device controller and a USB3.2 receptacle can correct

signal integrity issues resulting in a more robust system.

8.2 Typical USB3.2 Application

Figure 17. TUSB1002A in USB3.2 x1 Host Application

8.2.1 Design Requirements

For this design example, use the parameters shown in Table 4.

Table 4. Design Parameters

PARAMETER

VALUE

VCC supply (3 V to 3.6 V)

3.3 V

Mode of Operation (Dual or Half Channel)

MODE = F (Floating) for USB3.2 Dual Channel

TX1, TX2, RX1 A/C coupling Capacitor (75 nF to 265 nF)

100 nF

RX2 A/C coupling Capacitor (297 nF to 363 nF)

Suggest 330 nF ±10%

RX2 pull-down resistors on USB receptacle side of AC capacitor

(200K to 242K ohms)

220k

A to B FR4 Length (inches)

8

A to B FR4 Trace Width (mils)

4

C to D FR4 length (inches)

2

C to D FR4 Trace Width (mils)

4

DC Gain (-2, -1, 0, +1, +2)

0 dB (CFG[2:1] pins floating)

Linear Range (900 mV, 1000 mV, or 1200 mV)

1200 mV (CFG[2:1] pins floating)