SLLSEC6E September 2012 – June 2019 DP83848-EP
PRODUCTION DATA.
The magnetics have a large impact on the PHY performance as well. While several components are listed below, others may be compatible following the requirements listed in Table 6-4. It is recommended that the magnetics include both an isolation transformer and an integrated common mode choke to reduce EMI. When doing the layout, do not run signals under the magnetics. This could cause unwanted noise crosstalk. Likewise void the planes under discrete magnetics, this will help prevent common mode noise coupling. To save board space and reduce component count, an RJ-45 with integrated magnetics may be used.
PARAMETER | TYP | UNIT | CONDITION |
---|---|---|---|
Turn Ratio | 1:1 | — | ±2% |
Insertion Loss | –1 | dB | 1 MHz to 100 MHz |
Return Loss | –16 | dB | 1 MHz to 30 MHz |
–12 | dB | 30 MHz to 60 MHz | |
–10 | dB | 60 MHz to 80 MHz | |
Differential to Common Rejection Ratio | –30 | dB | 1 MHz to 50 MHz |
–20 | dB | 50 MHz to 150 MHz | |
Crosstalk | –35 | dB | 30 MHz |
–30 | dB | 60 MHz | |
Isolation | 1500 | Vrms | HPOT |