ADIN1101BCPZ-R7 datasheet(34/79 Pages) AD

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Data Sheet

ADIN1101

APPLICATIONS INFORMATION

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Rev. A | 34 of 79

SYSTEM LEVEL POWER MANAGEMENT

Transmit Level = 1.0 V p-p

The 1.0 V p-p transmit operating mode can operate at a lower

AVDD_H supply voltage of 1.8 V.

For applications where the ADIN1101 must operate in 1.0 V p-p

transmit operating mode, the RXD_0/TX2P4_EN pin must be tied

high via a 4.7 kΩ resistor (see Figure 22). This configuration forces

the ADIN1101 to only operate in 1.0 V p-p transmit operating mode

and enables the ADIN1101 to operate from a signal supply voltage

at a lower voltage rail (for example, 1.8 V), allowing the user to

minimize power dissipation in the system.

Figure 22. Supplies and Capacitors for Forced 1 V p-p Transmit Mode

Transmit Level = 2.4 V p-p

The higher transmit operating mode of 2.4 V p-p supports trunk

applications and requires a higher AVDD_H supply voltage of 3.3

V. This mode can be used for longer cable lengths in industrial

Ethernet environments with high noise levels.

For the ADIN1101 to be able to operate at 2.4 V p-p, the RXD_0/

TX2P4_EN pin must be held low (pin has an internal pull-down

resistor). This mode of operation still allows the 1.0 V p-p operating

mode to be selected via MDIO or via autonegotiation.

Multiple Supplies Configuration

Figure 23 shows an overview of the proposed power configuration.

Note that this configuration requires that AVDD_H = 3.3 V even

if the link is established in 1.0 V p-p transmit operating mode via

MDIO or autonegotiation.

Figure 23. Supplies and Capacitors for Multiple Supply 2.4 V p-p and 1.0 V

p-p Transmit Mode

Single-Supply Configuration

For single-supply operation, the same rail can be used to supply

the ADIN1101 AVDD_H, AVDD_L, and VDDIO supply rails. This

configuration is shown in Figure 24.

Figure 24. Supplies and Capacitors for Single-Supply 2.4 p-p Transmit Mode

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