ADIN1300CCPZ-R7 datasheet(44/96 Pages) AD

44 / 96 page

Data Sheet

ADIN1300

APPLICATIONS INFORMATION

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Rev. B | 44 of 96

Figure 36. RGMII Timing Example for 100 Mbps Data Rate, with Internal Delay Enabled

Figure 37. RGMII Timing Example for 1000 Mbps Data Rate, with Internal Delay Enabled

COMPONENT RECOMMENDATIONS

Crystal

The typical connection for an external crystal (XTAL) is shown

in Figure 38. To ensure minimum current consumption and to min-

imize stray capacitances, make connections between the crystal,

capacitors, and ground as close to the ADIN1300 as possible. Con-

sult individual crystal vendors for recommended load information

and crystal performance specifications.

Figure 38. Crystal Oscillator Connection

External Clock Input

If using a single-ended reference clock on XTAL_I/CLK_IN/

REF_CLK, leave XTAL_O open-circuit. The clock can be a unipolar

1.8 V/ 2.5 V/3.3 V, 25 MHz sine wave, or square wave signal.

When using the RMII MAC interface, a single, 50 MHz reference

clock (REF_CLK) is required, which can be sourced from the MAC

or from an external source. If the external clock input is supplied

before the AVDD_3P3 rail, reverse current protection circuitry may

be required to prevent leakage through the internal protection

circuitry onto the AVDD3P3.

Figure 39. External Clock Connection

Magnetics

Galvanic isolation is necessary between any two point-to-point

communication nodes in applications using the Ethernet protocol

to transmit/receive data to protect against faults and transients,

and achieve the best electromagnetic compatibility performance.

Magnetic coupling between the PHY and the RJ45 is the most

common way of achieving this isolation.

The magnetics can be discrete or integrated and there are

strengths and weaknesses to both. Choosing the discrete option

typically occupies more board space, but gives more freedom in

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