ADIN2111CCPZ-R7 datasheet(34/129 Pages) AD

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Data Sheet

ADIN2111

APPLICATIONS INFORMATION

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Rev. A | 34 of 129

SYSTEM LEVEL POWER MANAGEMENT

Transmit Level = 1.0 V p-p

The 1.0 V p-p transmit operating mode supports the spur use case

and can operate at a lower AVDD_H supply voltage of 1.8 V. This

mode supports intrinsic safe applications.

For applications where the ADIN2111 PHY 1 (respectively PHY

2) must operate in 1.0 V p-p transmit operating mode, the

P1_TX2P4_EN (respectively P2_TX2P4_EN) pin signal must be

tied high via a 4.7 kΩ resistor (see Figure 13 ). This configuration

forces the ADIN2111 to only operate in 1.0 V p-p transmit operating

mode and enables the ADIN2111 PHY 1 (respectively PHY 2) 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 13. 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 ADIN2111 PHY 1 (respectively PHY 2) to be able to operate

at 2.4 V p-p, the P1_TX2P4_EN (respectively P2_TX2P4_EN) pin

signal must be held low (the 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 SPI or autonegotiation.

Multiple Supplies Configuration

Figure 14 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 SPI

or autonegotiation.

Figure 14. 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 ADIN2111 AVDD_H, AVDD_L, and VDDIO supply rails. The

DVDDx_1P1 1.1 V rails can be derived internally or alternatively

provided by an external 1.1 V rail. This configuration is shown in

Figure 15.

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