ADIN1111CCPZ-R7 datasheet(28/109 Pages) AD

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Data Sheet

ADIN1111

APPLICATIONS INFORMATION

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Rev. A | 28 of 109

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 ADIN1111 must operate in a 1.0 V p-p

transmit operating mode, the TX2P4_EN pin must be tied high via

a 4.7 kΩ resistor (see Figure 19). This configuration forces the

ADIN1111 to only operate at 1.0 V p-p transmit operating mode and

enables the operation of the ADIN1111 from a signal supply voltage,

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

user to minimize power dissipation in the system.

Figure 19. Supplies and Capacitors for 1.0 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 ADIN1111 to be able to operate in 2.4 V p-p, the TX2P4_EN

pin must be tied low (no external connection required to achieve

this due to the presence of 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.

Figure 20 shows an overview of the proposed power configuration.

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

the AVDD_H, AVDD_L, and VDDIO supply rails. Note that this

configuration requires that AVDD_H is 3.3 V even if the link is

established at 1.0 V p-p transmit operating mode via MDIO or

autonegotiation.

Figure 20. Supplies and Capacitors for 2.4 V p-p and 1.0 V p-p Transmit Mode

LED CIRCUIT EXAMPLES

The LED_0 and LED_1 pins can be used in various circuit configu-

rations depending on the LED polarity mode selected (see LED

Polarity Register). The example circuits described in this section

provide examples for the three polarity modes available for each

LED, as follows:

►

Autosense (default)

►

Active low

►

Active high

As described in the LED Functions section, the maximum output

current for both LED_0 and LED_1 is 8 mA with a VDDIO =

3.3 V. For higher current requirements, consider using the circuit

described in Transistor Controlled LED.

Active High LED Polarity

In the active high configuration, the LED_x pin can drive an external

LED from the anode side. Select the R0 and R1 resistors to control

the LED current (refer to the selected LED specifications in Table

1 for information). External pull-down resistors (RPD0, RPD1) with a

value of 4.7 kΩ are recommended.

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