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R-IN32M4-CL3 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 Figure 6.3.
Common-mode chokes are not required on the R-IN32M4-CL3 (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 (from 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 115 .
For details, contact the corresponding manufacturer.
Figure 6.4 Example of Return Loss of Pulse Transformer
Recommended components of the pulse transformer as listed below.
Manufacturer
Pulse
R18UZ0074EJ0100
Dec 24, 2019
-(12-20log(f/80))dB or less (from 40 MHz to 100 MHz) *f: Frequency
Product Type Name
H5008NL
6. Gigabit Ethernet PHY Pins
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