Radiated Emissions Test Results (En 55022) - Analog Devices EVAL-ADN4650EB1Z User Manual

EVAL-ADN4650EB1Z User Guide

RADIATED EMISSIONS TEST RESULTS (EN 55022)

Radiated emissions testing is performed at an independent
external test facility with the EVAL-ADN4650EB1Z. Evaluating
the EVAL-ADN4650EB1Z to the EN 55022 standard is undertaken
in a 10 m radiated emissions test chamber using the test setup
shown in Figure 5. The setup comprises a battery-powered
EVAL-ADN4650EB1Z connected to a signal generator located
outside the chamber via coaxial cables. As specified by the
EN 55022 standard, both horizontal and vertical peak scans are
undertaken with any visible emissions peaks investigated using
quasi-peak detector measurement. For each frequency measured
using a quasi-peak detector, the device under test rotates through
360 degrees to find the worst case angle. The receiving antenna
then elevates from 1 m to 4 m in height to find the worst case
elevation. The worst case quasi-peak measurements are compared
to the EN 55022 Class B and Class A limits.
SIGNAL
10m COAX CABLE ×2
GENERATOR
NOTES
1. SIGNAL GENERATOR OUTSIDE TEST CHAMBER
2. INPUT SIGNAL: |V | = 300mV, V = 1.1V, 600MBPS PRBS7 OR 300MHz CLOCK
ID IC
Figure 5. Test Setup for EN 55022 Radiated Emissions Testing
2 × AA BATTERY
3V TO 3.15V
J9
V
IN1 GND1
GND2
V
DD1
J1
P4
R1
J2
R2
R4
J3
U1
R3
J4
GND1
EVAL-ADN4650EB1Z
J22
R12 R11
J 2 4
The test results are shown in Table 4; a classification report is
available on request (please contact Analog Devices or the
component distributor for support). Radiated emissions are
measured across 30 MHz to 1 GHz and from 1 GHz to 3 GHz.
With a 600 Mbps PRBS7 input, the
the EN 55022 Class B limits.
With a 300 MHz clock input, the
the EN 55022 Class A limits. To pass the Class B limits when
isolating high frequency clocks, reduce the printed circuit board
(PCB) clearance from the 8 mm implemented on
ADN4650EB1Z
Table 4. EN 55022 Radiated Emissions Classification
Test Condition
600 Mbps PRBS7
300 MHz Clock
Rev. 0 | Page 5 of 9
2 × AA BATTERY
3V TO 3.15V
J10
V
IN2
V
DD2
J5
P7
R7
TP7
TP8 J6
R8
R5
J7
TP9
R6
TP10
J8
GND2
J21
R10 R9
J 2 3
EVAL-ADN4650EB1Z
EVAL-ADN4650EB1Z
to, for example, 2 mm.
Result
Passes EN 55022 Class B
Passes EN 55022 Class A
UG-933
passes
passes
EVAL-