AFE031 datasheet(39/57 Pages) TI1

39 / 57 page

AFE031

www.ti.com

SBOS531D – AUGUST 2010 – REVISED MAY 2012

POWER SUPPLIES

The AFE031 has two low-voltage analog power-supply pins and one low-voltage digital supply pin. Internally, the

two analog supply pins are connected to each other through back-to-back electrostatic discharge (ESD)

protection diodes. These pins must be connected to each other on the application printed circuit board (PCB). It

is also recommended to connect the digital supply pin and the two analog supply pins together on the PCB. Both

low-voltage analog ground pins are also connected internally through back-to-back ESD protection diodes. These

ground pins should also be connected to the digital ground pin on the PCB. It is recommended to bypass the

low-voltage power supplies with a parallel combination of a 10-

μf and 100-nf capacitor. The PA block is biased

separately from a high-voltage, high-current supply.

Two PA power supply pins and two PA ground pins are available to provide a path for the high currents

associated with driving the low impedance of the ac mains. Connecting the two PA supply pins together is

recommended. It is also recommended to place a bypass capacitor of 47

μF to 100 μF in parellel with 100 nF as

close as possible to the AFE031. Care must be taken when routing the high current ground lines on the PCB to

avoid creating voltage drops in the PCB ground that may vary with changes in load current.

The AFE031 has many options to enable or disable the functional blocks to allow for flexible power-savings

modes. Table 17 shows the specific power supply that each functional block draws power from, as well as the

typical amount of power drawn from the associated power supplies for both the enabled and disabled states. For

additional information on power-supply requirements refer to Application Report SBOA130, Analog Front-End

Design for a Narrowband Power-Line Communications Modem Using the AFE031 (available for download at

www.ti.com).

Table 17. Power Consumption with Enable and Disable Times (Typical)

AVDD SUPPLY

DVDD SUPPLY

PA SUPPLY

BLOCK

STATUS

ENABLE TIME

DISABLE TIME

CURRENT

μs

–

61 mA

Off

–

μs

–

μA

μs

–

3.7 mA

–

Off

–

μs

μA

–

μs

–

5.3 mA

–

Off

–

μs

μA

–

μs

–

900

μA

–

ERx

Off

–

μs

μA

–

μs

–

1.2 mA

–

ETx

Off

–

μs

μA

–

μs

–

μA

–

DAC

Off

–

μs

–

μA

–

μs

–

μA

–

Off

–

μs

μA

–

μs

–

μA

REF1

Off

–

μs

–

μA

μs

–

μA

–

REF2

Off

–

μs

μA

–

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