Si5327-EVB Silicon Laboratories Inc, Si5327-EVB Datasheet - Page 20

• Manufacturer Part Number: Si5327-EVB
• Description: MCU, MPU & DSP Development Tools SI5327 EVAL BOARD
• Manufacturer: Silicon Laboratories Inc

Specifications of Si5327-EVB

• Processor To Be Evaluated: Si5327
• Interface Type: I2C, SPI
• Operating Supply Voltage: 3.3 V
• Lead Free Status / Rohs Status: Details

Si5327
4.1. External Reference
An external, high quality clock or a low-cost 40 MHz
crystal is used as part of a fixed-frequency oscillator
within the DSPLL. This external reference is required for
the device to perform jitter attenuation. Silicon
Laboratories recommends using a high quality crystal.
Specific recommendations may be found in the Family
Reference Manual.
In digital hold, the DSPLL remains locked and tracks the
external reference. Note that crystals can have
temperature sensitivities.
20
CKOUT_ALWAYS_ON
0
0
1
1
Table 8. CKOUT_ALWAYS_ON and SQ_ICAL Truth Table
SQ_ICAL
0
1
0
1
Preliminary Rev. 0.4
CKOUT OFF until after the first ICAL
CKOUT OFF until after the first successful
ICAL (i.e., when LOL is low)
CKOUT always ON, including during an ICAL
CKOUT always ON, including during an ICAL.
Use these settings to preserve output-to-output
skew
4.2. Further Documentation
Consult the Silicon Laboratories Si53xx Any Frequency
Precision Clock Family Reference Manual (Si53xx
FRM) for detailed information about the Si5327
functions. Additional design support is available from
Silicon Laboratories through your distributor.
Silicon Laboratories has developed a PC-based
software utility called DSPLLsim to simplify device
configuration, including frequency planning and loop
bandwidth selection. The FRM and this utility can be
downloaded from http://www.silabs.com/timing.
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