SI5347_16 Datasheet, PDF (27/55 Pages) Silicon Laboratories – Dual/Quad DSPLL Any-Frequency, Any-Output Jitter Attenuators

Si5347/46 Rev D Data Sheet
Electrical Specifications
Table 5.5. Differential Clock Output Specifications
(V_DD = 1.8 V ±5%, V_DDA = 3.3V ±5%, V_DDO = 1.8 V ±5%, 2.5 V ±5%, or 3.3 V ±5%, T_A = –40 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Output Frequency
f_OUT
0.0001
—
712.5
MHz
Duty Cycle
DC
f_OUT < 400 MHz
48
—
52
%
400 MHz < f_OUT < 712.5
45
—
55
%
MHz
Output-Output Skew
Using Same DSPLL
T_SKS
Outputs on same DSPLL
—
—
65
ps
(Measured at 712.5 MHz)
OUT-OUTb Skew
T_{SK_OUT}
Measured from positive to
—
0
50
ps
negative output pins
Output Voltage Amplitude¹
V_OUT
V_DDO = 3.3 V,
LVDS
350
430
510
mVpp_se
2.5 V, or 1.8 V
V_DDO = 3.3 V, LVPECL
640
750
900
2.5 V
Common Mode Voltage^1,2
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
LVDS
V_DDO = 1.8 V sub-LVDS
0.80
0.90
1.00
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
Si5347
—
–72
—
dB
Si5346
—
–88
—
dB
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 maximum LVDS single-ended amplitude can be up to 110 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. Measured for 156.25 MHz carrier frequency. 100 mVpp of sinewave noise added to VDDO = 3.3 V and noise spur amplitude
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 Sys-
tems”, 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
OUTxb
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