ADIN1110BCPZ-R7 datasheet(24/104 Pages) AD

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Data Sheet

ADIN1110

APPLICATIONS INFORMATION

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Rev. 0 | 24 of 104

SYSTEM LEVEL POWER MANAGEMENT

Transmit Level = 1.0 V p-p

The transmit mode of 1.0 V p-p can be used for shorter reach

applications supporting cable lengths up to 400 m where signal

amplitude requirements tend to be lower.

For applications where the ADIN1110 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 13). This configuration forces the

ADIN1110 to only operate at 1.0 V p-p transmit operating mode

and enables the operation of the ADIN1110 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 13. Supplies and Capacitors for 1.0 V p-p Transmit Mode

Transmit Level = 2.4 V p-p

For longer reach applications, a higher signal amplitude of 2.4 V p-p

is required. The ADIN1110 is designed to operate with long reach

cables up to 1000 m in this mode, requiring a higher AVDD_H

supply voltage of 3.3 V.

For the ADIN1110 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 14 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. The DVDD_1P1 1.1 V

rail can be derived internally or alternatively provided by an external

1.1 V rail. 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 14. 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 =

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