SI5347 datasheet(8/59 Pages) SILABS

Part #	SI5347

Description	DUAL/QUAD DSPLL ANY-FREQUENCY, ANY-OUTPUT JITTER ATTENUATORS

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Manufacturer	SILABS [Silicon Laboratories]

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Si5347/46

8

Rev. 1.1

Table 5. Differential Clock Output Specifications

(VDD = 1.8 V ±5%, VDDA = 3.3V ±5%, VDDO = 1.8 V ±5%, 2.5 V ±5%, or 3.3 V ±5%, TA = –40 to 85 °C)

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Output Frequency

fOUT

0.0001

—

712.5

MHz

Duty Cycle

DC

fOUT < 400 MHz

48

—

52

%

400 MHz < fOUT < 712.5 MHz

44

—

55

%

Output-Output Skew

TSK

Differential Output,

Normal Swing Mode

—20

50

ps

Differential Output,

Low Power Swing Mode

—

20

100

ps

OUT-OUT Skew

TSK_OUT

Measured from the positive to

negative output pins

—

0

100

ps

Output Voltage Amplitude1

Normal Mode

VOUT

VDDO =3.3 V,

2.5 V, or 1.8 V

LVDS

350

470

550

mVpp_se

VDDO = 3.3 V,

2.5 V

LVPECL

660

810

1000

Low Power Mode

VOUT

VDDO =3.3 V,

2.5 V, or 1.8 V

LVDS

300

420

530

mVpp_se

VDDO =3.3 V,

2.5 V

LVPECL

620

820

1060

Notes:

1. Output amplitude and common mode voltage are programmable through register settings and can be stored in NVM.

Each output driver can be programmed independently. The typical normal mode (or low power mode) LVDS maximum

is 100 mV (or 80 mV) higher than the TIA/EIA-644 maximum.Refer to the Si5347/46 Family Reference Manual for

more suggested output settings. Not all combinations of voltage amplitude and common mode voltages settings are

possible.

2. Driver output impedance depends on selected output mode (Normal, Low Power). Refer to the Si5347/46 Family

Reference Manual for more information.

3. Measured for 156.25 MHz carrier frequency. Sinewave noise added to VDDO (1.8 V = 50 mVpp, 2.5 V/

3.3 V = 100 mVpp) and noise spur amplitude measured.

4. Measured across two adjacent outputs, both in LVDS mode, with the victim running at 155.52 MHz and the aggressor

at 156.25 MHz. Refer to application note, “AN862: Optimizing Si534x Jitter Performance in Next Generation Internet

Infrastructure Systems”, guidance on crosstalk minimization. Note that all active outputs must be terminated when

measuring crosstalk.

OUTx

Vpp_se

Vpp_diff = 2*Vpp_se

Vcm

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