ADSP-BF539(RevA) 데이터 시트보기 (PDF) - Analog Devices

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ADSP-BF539
(Rev.:RevA)

Blackfin Embedded Processor

Analog Devices 

ADSP-BF539/ADSP-BF539F

MPIVDD–MXVR PLL 1.25 V power

• Should be routed with wide traces or as power plane.

• A ferrite bead should be placed between the 1.25 V VDDINT

power plane and the MPIVDD pin for noise isolation.

• Locally bypass MPIVDD with 0.1 μF and 0.01 μF decou-

pling capacitors to MXEGND.

• Avoid routing other switching signals near to MPIVDD to

avoid crosstalk.

Fiber optic transceiver (FOT) connections

• The traces between the ADSP-BF539/ADSP-BF539F pro-

cessor and the FOT should be kept as short as possible.

• The receive data trace connecting the FOT receive data

output pin to the ADSP-BF539/ADSP-BF539F MRX input

pin should not have a series termination resistor. The edge

rate of the FOT receive data signal driven by the FOT is

typically very slow, and further degradation of the edge rate

is not desirable.

• The transmit data trace connecting the

ADSP-BF539/ADSP-BF539F MTX output pin to the FOT

Transmit Data input pin should have a 27 Ω series termi-

nation resistor placed close to the ADSP-BF539/ADSP-

BF539F MTX pin.

• The receive data trace and the transmit data trace between

the ADSP-BF539/ADSP-BF539F processor and the FOT

should not be routed close to each other in parallel over

long distances to avoid crosstalk.

VOLTAGE REGULATOR LAYOUT GUIDELINES

Regulator external component placement, board routing, and

bypass capacitors all have a significant effect on noise injected

into the other analog circuits on-chip. The VROUT1-0 traces

and voltage regulator external components should be consid-

ered as noise sources when doing board layout and should not

be routed or placed near sensitive circuits or components on the

board. All internal and I/O power supplies should be well

bypassed with bypass capacitors placed as close to the ADSP-

BF539/ADSP-BF539F as possible.

For further details on the on-chip voltage regulator and related

board design guidelines, see the Switching Regulator Design

Considerations for ADSP-BF533 Blackfin Processors (EE-228)

applications note on the Analog Devices website

(www.analog.com)—use site search on “EE-228”.

Rev. A | Page 20 of 60 | February 2008

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