TUSB1146 datasheet(9/68 Pages) TI2

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TUSB1146

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SLLSFB2 – APRIL 2020

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USB and DP Electrical Characteristics (continued)

over operating free-air temperature and voltage range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VSSRX-LIMITED-VODL0

SSRX differential peak-to-peak voltage

when configured for limited redriver

and LINR_L0

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 0;

800

mVpp

VSSRX-LIMITED-VODL1

SSRX differential peak-to-peak voltage

when configured for limited redriver

and LINR_L1

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 0;

900

mVpp

VSSRX-LIMITED-VODL2

SSRX differential peak-to-peak voltage

when configured for limited redriver

and LINR_L2

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 0;

1000

mVpp

VSSRX-LIMITED-VODL3

SSRX differential peak-to-peak voltage

when configured for limited redriver

and LINR_L3

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 0;

1100

mVpp

VSSRX-DE-RATIO0

SSRX de-emphasis when configured

for limited redriver and de-emphasis

enabled.

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 1;

TX_DEEPHASIS = 2'b00;

USB_SSRX_VOD = 2'b00 (LINR_L3);

Refer to Figure 25

-1.5

VSSRX-DE-RATIO1

SSRX de-emphasis when configured

for limited redriver and de-emphasis

enabled.

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 1;

TX_DEEPHASIS = 2'b01;

USB_SSRX_VOD = 2'b00

(LINR_L3); Refer to Figure 25

-2.1

VSSRX-DE-RATIO2

SSRX de-emphasis when configured

for limited redriver and de-emphasis

enabled.

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 1;

TX_DEEPHASIS = 2'b10;

USB_SSRX_VOD = 2'b00

(LINR_L3); Refer to Figure 25

-3.2

VSSRX-DE-RATIO3

SSRX de-emphasis when configured

for limited redriver and de-emphasis

enabled.

TX_PRESHOOT_EN = 0;

TX_DEEMPHASIS_EN = 1;

TX_DEEPHASIS = 2'b11;

USB_SSRX_VOD = 2'b00

(LINR_L3); Refer to Figure 25

-3.8

VSSRX-PRESH-RATIO0

SSRX pre-shoot level when configured

for limited redriver and pre-shoot

enabled.

TX_PRESHOOT_EN = 1;

TX_DEEMPHASIS_EN = 0;

TX_PRESHOOT = 2'b00;

USB_SSRX_VOD = 2'b00 (LINR_L3);

Refer to Figure 26

1.5

VSSRX-PRESH-RATIO1

SSRX pre-shoot level when configured

for limited redriver and pre-shoot

enabled.

TX_PRESHOOT_EN = 1;

TX_DEEMPHASIS_EN = 0;

TX_PRESHOOT = 2'b01;

USB_SSRX_VOD = 2'b00 (LINR_L3);

Refer to Figure 26

2.0

VSSRX-PRESH-RATIO2

SSRX pre-shoot level when configured

for limited redriver and pre-shoot

enabled.

TX_PRESHOOT_EN = 1;

TX_DEEMPHASIS_EN = 0;

TX_PRESHOOT = 2'b10;

USB_SSRX_VOD = 2'b00 (LINR_L3);

Refer to Figure 26

2.3

VSSRX-PRESH-RATIO3

SSRX pre-shoot level when configured

for limited redriver and pre-shoot

enabled.

TX_PRESHOOT_EN = 1;

TX_DEEMPHASIS_EN = 0;

TX_PRESHOOT = 2'b11;

USB_SSRX_VOD = 2'b00 (LINR_L3);

Refer to Figure 26

2.8

ITX(SHORT)

TX short circuit current

TX± shorted to GND

CTX(PARASITIC)

TX input capacitance for return loss

At package pins, at 5 GHz

0.9

1.25

RLTX(DIFF)

Differential return loss

50 MHz – 1.25 GHz at 90 Ω

-30

5 GHz at 90 Ω

-21

RLTX(CM)

Common-mode return loss

50 MHz – 5 GHz at 90 Ω

-10

CTX-AC(COUPLING)

External required AC coupling

capacitor

265

AC Characteristics

Crosstalk

Differential crosstalk between TX and

RX signal pairs

at 5 GHz; EQ = 0;

–30

CPLF-LINRL0

Low-frequency 1-dB compression

point at LINR_L0 setting.

At 100 MHz, 200 mVpp < VID < 1200

mVpp

600

mVpp

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