SI5348 Datasheet, PDF (29/54 Pages) Silicon Laboratories – Network Synchronizer for SyncE/ 1588 PTP Telecom Boundary (T-BC) and Slave (T-SC) Clocks

Si5348 Rev D Data Sheet
Electrical Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Common Mode Voltage¹
V_CM
V_DDO = 3.3 V
LVDS
1.10
1.20
1.30
V
LVPECL
1.90
2.00
2.10
V_DDO = 2.5 V LVPECL,
1.10
1.20
1.30
V
LVDS
V_DDO = 1.8 V sub-LVDS
0.80
0.90
1.00
V
Rise and Fall Times
t_R/t_F
(20% to 80%)
—
100
150
ps
Differential Output Impedance
Z_O
—
100
—
Ω
Power Supply Noise Rejection²
PSRR
10 kHz sinusoidal noise
—
–101
—
dBc
100 kHz sinusoidal noise
—
–96
—
dBc
500 kHz sinusoidal noise
—
–99
—
dBc
1 MHz sinusoidal noise
—
–97
—
dBc
Output-output Crosstalk³
XTALK
—
–72
—
dBc
Note:
1. Output amplitude and common mode settings are programmable through register settings and can be stored in NVM. Each out-
put driver can be programmed independently. Note that the maximum LVDS single-ended amplitude can be up to 110 mV higher
than the TIA/EIA-644 maximum. Refer to the Si5348 Reference Manual for recommended settings. Not all combinations of volt-
age amplitude and common mode voltages settings are possible.
2. Measured for 156.25 MHz carrier frequency. 100 mVpp of sinewave noise added to VDDO running at 3.3 V and noise spur ampli-
tude measured.
3. 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
Vcm
Vcm
Vpp_se
Vpp_se
Vpp_diff = 2*Vpp_se
OUTx
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