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SI5345 Datasheet(PDF) 11 Page - Silicon Laboratories

Part # SI5345
Description  10-CHANNEL, ANY-FREQUENCY, ANY-OUTPUT JITTER ATTENUATOR/CLOCK MULTIPLIER
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI5345 Datasheet(HTML) 11 Page - Silicon Laboratories

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Si5345/44/42
Rev. 1.0
11
Power Supply Noise
Rejection4
PSRR
Normal Mode
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
dBc
100 kHz sinusoidal noise
–95
500 kHz sinusoidal noise
–84
1 MHz sinusoidal noise
–76
Output-output Crosstalk
XTALK
Si5345
Measured spur from adjacent output5
–75
dBc
Si5342/44
Measured spur from adjacent output5
–85
dBc
Table 5. Differential Clock Output Specifications (Continued)
(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
Note:
1.
For normal and low-power modes, the amplitude and common-mode settings 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. Also note that the
output voltage swing specifications are given in peak-to-peak single-ended swing.
2.
Not all combinations of voltage swing and common mode voltages settings are possible. See the Si5345/44/42 Family
Reference Manual for details.
3.
Driver output impedance depends on selected output mode (Normal, Low-Power).
4.
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.
5.
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 “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.


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