TUSB1146 datasheet(8/68 Pages) TI2

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TUSB1146

SLLSFB2 – APRIL 2020

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6.7 USB and DP Electrical Characteristics

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

USB Gen 2 Differential Receiver (RX1p/n, RX2p/n, SSTXp/n)

V(RX-DIFF-PP)

Input differential peak-peak voltage

swing linear dynamic range

AC-coupled differential peak-to-peak

signal measured post CTLE through a

reference channel

1200

mVpp

V(RX-DC-CM)

Common-mode voltage bias in the

receiver (DC)

VRX_CM-INST

Max Instantaneous RX DC common

mode voltage change under all

operating conditions (OFF to ON,

Disabled to USB, etc…)

Measured at non-TUSB1146 side of

AC coupling capacitor with 200-k

Ω

load.

-200

500

R(RX-DIFF-DC)

Differential input impedance (DC)

Present after a GEN2 device is

detected on TXP/TXN

120

R(RX-CM-DC)

Receiver DC common mode

impedance

Present after a GEN2 device is

detected on TXP/TXN

Z(RX-HIGH-IMP-DC-POS)

Common-mode input impedance with

termination disabled (DC)

Present when no GEN2 device is

detected on TXP/TXN. Measured over

the range of 0-500mV with respect to

GND.

kΩ

V(SIGNAL-DET-DIFF-PP)

Input differential peak-to-peak signal

detect assert level

At 10 Gbps, no input loss, PRBS7

pattern

V(RX-IDLE-DET-DIFF-PP)

Input differential peak-to-peak signal

detect de-assert Level

At 10 Gbps, no input loss, PRBS7

pattern

V(RX-LFPS-DET-DIFF-PP)

Low frequency periodic signaling

(LFPS) detect threshold

Below the minimum is squelched

100

300

V(RX-CM-AC-P)

Peak RX AC common-mode voltage

Measured at package pin

150

C(RX)

RX input capacitance to GND

At 5 GHz;

0.88

RL(RX-DIFF)

Differential return Loss

50 MHz – 1.25 GHz at 90 Ω;

–19

5 GHz at 90 Ω;

–10

RL(RX-CM)

Common-mode return loss

50 MHz – 5 GHz at 90 Ω;

–10

EQ_SSTX15

SSTX Receiver equalization at 5 GHz

FLIPSEL = 0; SSEQ_SEL = 15;

11.5

EQ_RX15

RX1 Receiver equalization at 5 GHz

FLIPSEL = 0; EQ1_SEL = 15;

11.0

CAC-USB1

Required external AC capacitor on

SSTX

265

CAC-USB2

Optional external AC capacitor on RX1

and RX2.

297

363

USB Gen 2 Differential Transmitter (TX1p/n, TX2p/n, SSRXp/n)

VTX(DIFF-PP)

Transmitter dynamic differential

voltage swing range.

1200

mVpp

VTX(RCV-DETECT)

Amount of voltage change allowed

during receiver detection

600

VTX-CM-INST-ONOFF

Max Instantaneous TX DC common

mode voltage change under operating

condition: OFF to ON, ON to OFF,

during Rx.Detect; Disconnect to U0,

U2/U3 to U0.

Measured single-ended at non-

TUSB1146 side of AC coupling

capacitor with 200-k

Ω load.

-500

800

VTX(CM-IDLE-DELTA)

Transmitter idle common-mode

voltage change while in U2/U3 and not

actively transmitting LFPS

–300

600

VTX(DC-CM)

Common-mode voltage bias in the

transmitter (DC)

VTX(CM-AC-PP-ACTIVE)

Tx AC common-mode voltage active

Max mismatch from Txp + Txn for both

time and amplitude

100

mVpp

VTX(IDLE-DIFF-AC-PP)

AC electrical idle differential peak-to-

peak output voltage

At package pins

VTX(CM-DC-ACTIVE-IDLE-

DELTA)

Absolute DC common-mode voltage

between U1 and U0

At package pin

200

RTX(DIFF)

Differential impedance of the driver

120

RTX(CM)

Common-mode impedance of the

driver

Measured with respect to AC ground

over

0–500 mV

TUSB1146 Datasheet(PDF) 8 Page - Texas Instruments

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