ADIN1100BCPZ-R7 datasheet(34/80 Pages) AD

34 / 80 page

Data Sheet

ADIN1100

APPLICATIONS INFORMATION

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Rev. B | 34 of 80

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 ADIN1100 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 17 ). This configuration forces

the ADIN1100 to only operate in 1.0 V p-p transmit operating mode

and enables the ADIN1100 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 17. 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 ADIN1100 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 18 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 18. 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 ADIN1100 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. This configuration is shown in

Figure 19.

Figure 19. Supplies and Capacitors for Single-Supply 2.4 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 the LED

Polarity Register section). The circuits described in the following

sections provide examples for three polarity modes that are availa-

ble for each LED.

►

Autosense (default)

►

Active high

►

Active low

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