Recommended Components - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual: Board design edition
6.2.2

Recommended Components

We recommend using pulse transformer that satisfy the following conditions.
We also recommend the constitution illustrated in Transformer of Fig6.3.
Common-mode chokes are not required on the R-IN32M4-CL2 (PHY side) and is mounted on the connector.
Winding ratio: 1:1 (±2% or less, or ±3%) recommended
Return loss (see Figure 6.4): -18dB or less (1.0 MHz to 40 MHz)
Caution: We recommend as little variation in return loss from 1.0 MHz to 40 MHz as possible.
The impedance is 85, 100, or 115Ω.
For details, contact the corresponding manufacturer.
Figure 6.4 Example of Return Loss of Pulse Transformer
Recommended components of the pulse transformer are as listed below.
Manufacturer
Pulse
R18UZ0046EJ0200
Dec. 28, 2018
-(12-20log(f/80))dB or less (40 MHz to 100MHz) *f: Frequency
Product Type Name
H5008NL
6. Gigabit Ethernet PHY Pins
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