EVAL-ADM2582EEBZ/EVAL-ADM2587EEBZ User Guide
UG-044
Rev. D | Page 5 of 13
08420-
003
KEEP OUT AREA
FOR L2 AND L3.
NO GND2 PLANE FILL
ON ANY PCB LAYER.
Figure 3. Layout Notes for
EVAL-ADM2582EEBZ
and
EVAL-ADM2587EEBZ
•
Locate the power delivery circuit in close proximity to the
ADM2582E
/
ADM2587E
device, so that the V
CC
trace is as
short as possible. The
EVAL-ADM2582EEBZ
and
EVAL-
ADM2587EEBZ
PCB has a power delivery circuit located
at the bottom of the PCB with a short trace from the
ADP667ARZ
regulator output to V
CC
(Pin 8). This layout
example minimizes the loop area in which high frequency
current can flow. An increase in the loop area results in an
increase in the emissions levels.
Table 2. PCB Stack Up
Primary V
CC
Side
Secondary V
ISO
Side
Layer 1: Ground 1 plane Layer 1: Ground 2 plane
Layer 1: Ground 1 plane Layer 2: Ground 2 plane
Layer 3: V
CC
plane
Layer 3: Ground 2 plane (overlap
stitching capacitor)
Layer 4: Ground 1 plane Layer 4: Ground 2 plane
EN55022 RADIATED EMISSIONS TEST RESULTS
The
EVAL-ADM2587EEBZ
evaluation board is tested and
certified to pass EN55022 Class B with a >5 dB µV/m margin.
The
EVAL-ADM2582EEBZ
evaluation board is tested and certified
to pass EN55022 Class B. EN55022 certification documents for
the
EVAL-ADM2582EEBZ
and
EVAL-ADM2587EEBZ
evaluation
boards are available to users upon request from Analog Devices,
Inc.
Table 3 provides a summary of the capability of the
EVAL-
ADM2582EEBZ
and
EVAL-ADM2587EEBZ
evaluation boards.
All EN55022 radiated emissions tests are performed with the PCB
schematic and layout, as described in Figure 8 to Figure 13.
Table 3. EN55022 Test Results Summary
Device
Configuration
EN55022 Class B Result
ADM2582E
3.3 V V
CC
, 16 Mbps,
60 Ω load
Pass (with 4.7 dB µV/m
margin)
ADM2582E
5.0 V V
CC
, 16 Mbps,
60 Ω load
Pass (with 6.5 dB µV/m
margin)
ADM2587E
3.3 V V
CC
, 500 kbps,
60 Ω load
Pass (with 5.5 dB µV/m
margin)
ADM2587E
5.0 V V
CC
, 500 kbps,
60 Ω load
Pass (with 8.5 dB µV/m
margin)
The
EVAL-ADM2582EEBZ
and
EVAL-ADM2587EEBZ
evaluation
boards are configured and tested with 3.3 V V
CC
or 5.0 V V
CC
power
supplied to the
ADM2582E
and
ADM2587E
devices, with the
power supplied from the
ADP667ARZ
regulator output to V
CC
(Pin 8). The
ADP667ARZ
regulator input is supplied from a
standard 9 V battery. All EN55022 radiated emissions testing is
performed with 9 V batteries. Testing is performed at a 500 kbps
clock (
ADM2587E
) or 16 Mbps clock (
ADM2582E
), with the
clock supplied by the on-board oscillator. The
ADM2582E
/
ADM2587E
transceiver is connected in full-duplex mode and the
bus pins are loaded with a 60 Ω termination resistor. Measurements
are carried out in a semi anechoic chamber at 10 m from 30 MHz
to 2 GHz . Figure 4 to Figure 7 show the results of the worst case
horizontal scans, and Table 4 to Table 7 show the tabulated
quasi-peak (QP) results.
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