SI5380 Datasheet, PDF(27/50 Page) Silicon Laboratories – Ultra-Low Phase Noise, 12-output JESD204B Clock Generator

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SI5380 Datasheet, PDF (27/50 Pages) Silicon Laboratories – Ultra-Low Phase Noise, 12-output JESD204B Clock Generator

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Si5380 Data Sheet

Electrical Specifications

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Power Supply Noise

PSRR

Normal Mode

Rejection4

10 kHz sinusoidal noise

-93

dBc

100 kHz sinusoidal noise

-93

500 kHz sinusoidal noise

-84

1 MHz sinusoidal noise

-79

Low Power Mode

10 kHz sinusoidal noise

-98

100 kHz sinusoidal noise

-95

500 kHz sinusoidal noise

-84

1 MHz sinusoidal noise

-76

Output-Output Cross-

XTALK

Measured spur from adjacent

-75

talk

output

Note:

1. Normal mode and low power mode 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 maxi-

mum is 100 mV (or 80 mV) higher than the TIA/EIA-644 maximum. Refer to the Si5380 Reference Manual for more details on

2. Not all combinations of voltage amplitude and common mode voltages settings are possible. See the Si5380 Reference Manual

for more information.

3. Driver output impedance depends on selected output mode (Normal, Low Power).

4. Measured for 122.88 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.

5. Measured across two adjacent outputs, both in LVDS mode, with the victim running at 76.8 MHz and the aggressor at 92.08 MHz.

Refer to application note, "AN862: Optimizing Si534x Jitter Performance in Next Generation Internet Infrastructure Systems", for

guidance on crosstalk optimization. Note that all active outputs must be terminated when measuring crosstalk

Parameter

Output Frequency

Duty Cycle

Output-to-Output Skew

Table 5.6. LVCMOS Clock Output Specifications

Symbol

TSK

Test Condition

fOUT < 100 MHz

100 MHz < fOUT < 250 MHz

Min

Typ

Max

Unit

0.48

250

MHz

100

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