EVAL-ADN4650EB1Z User Guide UG-933
Rev. 0 | Page 5 of 9
RADIATED EMISSIONS TEST RESULTS (EN 55022)
SIGNAL
GENERATOR
10m COAX CABLE ×2
NOTES
1. SIGNAL GENERATOR OUTSIDE TEST CHAMBER
2. INPUT SIGNAL: |V
ID
| = 300mV, V
IC
= 1.1V, 600MBPS PRBS7 OR 300MHz CLOCK
13761-105
GND1
GND1
GND2
GND2
V
DD2
V
DD1
V
IN1
V
IN2
P4
R1
R12 R11 R10
R2
R4
R8
R5
R3
R7
TP8
TP7
TP9
TP10
R6
R9
J9
J1
J2
J3
J4
J5
J6
J7
J8
J10
J22
J21
32J42J
U1
P7
EVAL-ADN4650EB1Z
2 × AA BATTERY
3V TO 3.15V
2 × AA BATTERY
3V TO 3.15V
Figure 5. Test Setup for EN 55022 Radiated Emissions Testing
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.
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 EVAL-ADN4650EB1Z passes
the EN 55022 Class B limits.
With a 300 MHz clock input, the EVAL-ADN4650EB1Z passes
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 EVAL-
ADN4650EB1Z to, for example, 2 mm.
Table 4. EN 55022 Radiated Emissions Classification
Test Condition Result
600 Mbps PRBS7 Passes EN 55022 Class B
300 MHz Clock Passes EN 55022 Class A
