ADIN1300CCPZ-R7 datasheet(45/96 Pages) AD

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Data Sheet

ADIN1300

APPLICATIONS INFORMATION

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Rev. B | 45 of 96

terms of layout, tends to be cheaper than integrated magnetics, and

offers better performance overall.

The integrated approach is a combined RJ45 connector jack with

the magnetics built in, which provides a more compact solution

due to fewer components and, in applications where space is at

a premium, condenses the required footprint, but tends to cost

more. Magnetics cores tend to be smaller and closer to each other,

which can compromise EMC performance, increase the likelihood

of crosstalk, and have impacts on performance by increasing losses

and introducing nonlinear distortion.

For optimum performance, a discrete transformer with integrated

common-mode choke is recommended for use with the ADIN1300

PHY. The common-mode choke is important because it attenuates

any common-mode signals picked up by the twisted pair cable from

the environment, improving the signal-to-noise ratio of the system.

Transformers with an autotransformer stage following the common-

mode choke provide additional attenuation of common-mode noise.

Not all transformers include an autotransformer stage, integrated

RJ45s that have the magnetics included tend to have fewer cores

and therefore no autotransformer.

The ADIN1300 transmit drivers are voltage mode with on-chip

terminations. Therefore, connect each of the center tap pins on the

transformer on the ADIN1300 side separately to ground through a

0.1 μF capacitor.

The key considerations for the magnetics are outlined in Table 31.

Table 31. Magnetics Selection

Parameter

Value

Conditions

Turns Ratio

1CT:1CT

Open-Circuit Inductance

350 μH

Min: 100 mV, 100 kHz, 8 mA

Insertion loss

−1 dB

Max: 0 MHz to 100 MHz

MDI ESD Protection

As shown in Figure 31, a transient voltage suppressor (TVS) diode

is recommended in the MDI path.

MDI Capacitive Coupling

Typically, Ethernet applications use galvanic isolation in the form

of magnetics between link partners as shown in Figure 31 and

Figure 32. Some applications may need to provide isolation through

capacitive coupling instead of using magnetics. The ADIN1300 can

support capacitive coupling for short cable distances or backplane

applications. Include a TVS diode on the MDI pairs for protection

against ESD, transients, and surges. If cable length is longer than

1 meter, a common-mode choke is also recommended to minimize

induced common-mode noise. Set the B_100_ZPTM_EN_DIMRX

bit to zero to disable zero-power termination mode and enable

active termination.

Figure 40. Media Dependent Interface Using Capacitive Coupling

POWER REQUIREMENTS

The ADIN1300 has the following three power supply domains and

requires a minimum of two supply sources, 0.9 V and 3.3 V:

►

DVDD_0P9 is the 0.9 V digital core power supply input.

►

AVDD_3P3 is the 3.3 V analog power supply input for the PHY

MDI interface, analog circuitry, crystal oscillator, DLL, RESET_N,

CLK25_REF generation, and LED circuitry.

►

VDDIO enables the MDIO and MAC interface voltage supply

to be configured independently of the other circuitry on the

ADIN1300.

There are no power supply sequencing requirements around the

order of power being applied to the device. See the Power-Up

Timing section for more details.

The following simplified system level power solutions show three

recommended arrangements for powering the ADIN1300 PHY and

companion two-port switch (note that depending on the choice of

two-port switch, there may be differing power supply requirements

to what is shown).

Figure 41. Recommended Power Solution for 3.3 V with RGMI Operating at

VDDIO = 1.8 V

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