EVAL-ADM2582EEMIZ/EVAL-ADM2587EEMIZ User Guide
UG-916
Rev. 0 | Page 5 of 12
4mm MINIMUM GAP
BETWEEN GND2 PLANE
AND GND2 FILL FOR C19
“KEEP OUT” AREA
FOR L2 AND L3.
NO GND2 PLANE FILL
ON ANY PCB LAYER.
1
400
3-
00
3
Figure 3. Layout Notes for
EVAL-ADM2582EEMIZ
and
EVAL-ADM2587EEMIZ
Locate the power delivery circuit in close proximity to the
ADM2587E
/
ADM2582E
device, so the V
CC
trace is as
short as possible. The
EVAL-ADM2582EEMIZ
and
EVAL-ADM2587EEMIZ
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.
EN55022 RADIATED EMISSIONS TEST RESULTS
The
ADM2587E
evaluation board is tested and certified to pass
EN55022 Class A with >6 dbμV margin. The
ADM2582E
evaluation board is tested and certified to pass EN55022 Class A.
EN55022 Certification documents for the
EVAL-ADM2582EEMIZ
and
EVAL-ADM2587EEMIZ
evaluation boards are available to
customers upon request from Analog Devices, Inc.
Table 3 provides a summary of the capability of the
EVAL-
ADM2582EEMIZ
and
EVAL-ADM2587EEMIZ
evaluation boards.
All EN55022 radiated emissions tests are performed with the PCB
schematic and layout as described in Figure 10 to Figure 13. The
C19 capacitor (See Figure 10) high voltage discrete capacitor is
removed for some tests. Table 2 describes the effect of removing or
adding the capacitor.
Table 2. EN55022 Test Results Summary
Device
Configuration
EN 55022 Result
ADM2587E
C19 not fitted
Pass Class A (3.9 dbμV margin)
ADM2582E
C19 not fitted
Pass Class A (1.2 dbμV margin)
ADM2582E
C19
fitted
Pass Class A (with a larger 7.5 dbμV
margin)
The
EVAL-ADM2582EEMIZ
and
EVAL-ADM2587EEMIZ
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
500 kbps clock (
ADM2587E
) or 16 Mbps clock (
ADM2582E
),
with the clock supplied by the on-board oscillator. The
ADM2587E
/
ADM2582E
transceiver is connected in full-duplex
mode and the bus pins are loaded with a 54 Ω termination resistor
(maximum bus loading). Measurements are carried out in an
anechoic chamber at 10 m from 30 MHz to 2 GHz. Figure 4 to
Figure 9 show the results of the worst case horizontal scans and
Table 3 to Table 8 show the tabulated quasi-peak (QP) results.
Table 3.
ADM2587E
3.3V V
CC
Test Results (Not Using a High
Voltage Discrete Capacitor Between GND
1
and GND
2
)
Frequency
(MHz)
QP Level
dB (μV/m)
EN55022
Class A
dB (μV/m)
Antenna
Position
Antenna
Height (m) Pass/Fail
180.0040 26.7
40
Horizontal 4
Pass
358.4040 34.0
47
Vertical
3.5
Pass
359.9560 43.1
47
Horizontal 2.5
Pass
80
70
60
20
0
30
100
1000
EN55022
CLASS A
EN55022
CLASS B
14
00
3-
00
4
10
50
40
30
RADI
AT
E
D
E
M
IS
S
IO
N
S
(
d
Bµ
V
/m)
FREQUENCY (MHz)
Figure 4. Horizontal Scan from 30 MHz to 1000 MHz
(Corresponds to Worst Case for Table 3)
