ADE9113 datasheet(44/55 Pages) AD

44 / 55 page

Data Sheet

ADE9103/ADE9112/ADE9113

POWER MANAGEMENT

analog.com

Rev. A | 44 of 55

DC-TO-DC CONVERTER

The DC-to-DC converter section of the ADE9112 and ADE9113

works on principles that are common to most modern power supply

designs. The internal DC-to-DC converter of the ADE9112 and

ADE9113 is supplied by the VDD pin and is continuously active

as long as the RESET pin is not asserted. In normal operation,

maintain VDD between 2.97 V and 3.63 V.

VDD power is supplied to an oscillating circuit that drives the

primary side of a chip-scale air core transformer. Using another

chip-scale air core transformer, a feedback circuit measures VDDI-

SO and passes the information back into the VDD domain, where a

pulse-width modulation (PWM) control block controls the AC source

to maintain the floating VDDISO supply at 2.0 V as shown in Figure

56. This isolated voltage supply is then fed to the integrated 1.8 V

LDO regulator at the AVDD pin.

Figure 56. Isolated DC-to-DC Converter Block Diagram

During normal operations, the frequency of emissions is hopping

between 300 MHz and 420 MHz as described in the EMI_CONFIG

different modes for controlling the frequency spread of the AC

source. The EMI_HI_LIMIT, EMI_MID_LIMIT, and EMI_LO_LIMIT

are read only registers that contain the values that correspond

to the frequency limits of 420 MHz, 360 MHz, and 300 MHz.

The EMI_LO_MASK and EMI_HI_MASK allows frequencies to be

removed from the sawtooth and ramp frequency sweeps. The

range of removed frequencies is inclusive of EMI_LO_MASK and

EMI_HI_MASK. The EMI_LO_LIMIT and EMI_HI_LIMIT registers

can be used as a reference to calculate the desired values to mask.

The equations to calculate the EMI_LO_LIMIT and EMI_HI_LIM-

IT for a desired frequency range using the EMI_LO_LIMIT and

EMI_HI_LIMIT registers is as follow:

EMI_LO_MASK = ROUNDUPEMI_LO_LIMIT ‐ EMI_HI_LIMIT

300 MHz ‐ 420 MHz × (fLO_MASK‐300 MHz) + EMI_LO_LIMIT

(6)

EMI_HI_MASK = ROUNDDOWNEMI_LO_LIMIT ‐ EMI_HI_LIMIT

300 MHz ‐ 420 MHz × fHI_MASK‐300 MHz + EMI_LO_LIMIT

(7)

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