SPC574K72E5 datasheet(69/127 Pages) STMICROELECTRONICS

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SPC574Kxx

Electrical characteristics

126

3.14

Aurora LVDS electrical characteristics

The following table describes the Aurora LVDS electrical characteristics.

Note:

The Aurora interface is AC coupled, so there is no common-mode voltage specification.

Integrated phase noise (single side

band)

fRF_REF = 20 MHz

—

–58

dBc

DfRF_REF = 10 MHz

—

–64

fVCO

PLL VCO frequency

—

640(2)

—MHz

tLOCK

PLL phase lock(3)

——

—

µs

PER

REF

Input reference clock jitter (peak to

peak)

Single period,

fRF_REF = 10 MHz

——

300

Long term,

fRF_REF = 10 MHz

–500

—

500

PER

EYE

Output Eye Jitter (peak to peak)(4)

——

—

400

The specifications in this table apply to both the interprocessor bus and debug LFAST interfaces.

The 640 MHz frequency is achieved with a 10 MHz or 20 MHz reference clock. With a 26 MHz reference, the VCO

frequency is 624 MHz. PLL lock with 640 MHz VCO frequency guaranteed by production testing.

The time from the PLL enable bit register write to the start of phase locks is maximum 2 clock cycles of the peripheral

bridge clock that is connected to the PLL on the device.

Measured at the transmitter output across a 100 Ohm termination resistor on a device evaluation board. See Figure 18.

Table 34. LFAST PLL electrical characteristics(1)(Continued)

Symbol

Parameter

Conditions

Value

Unit

Min

Nominal

Max

Table 35. Aurora LVDS electrical characteristics(1)(2)

Symbol

Parameter

Conditions

Value

Unit

Min

Typ

Max

Transmitter

FTX

Transmit Data Rate

—

1.25 Gbps

V

OD_LVDS

Differential output voltage swing

(terminated)(3)

—

400

600

800

tTR_LVDS

Rise/Fall time (10%–90% of swing)

—

RV_L_Tx

Differential Terminating resistance

—

100

120

TLoss

Transmission Line Loss due to loading

effects

——

—

6(4)

Transmission line characteristics (PCB track)

LLINE

Transmission line length

—

ZLINE

Transmission line characteristic

impedance

—45

Cac_clk

Clock Receive Pin External AC

Coupling Capacitance

Values are nominal, valid

for +/– 50% tolerance

100

—

270

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