Changes To Figure 6 Caption And Radiated Emissions Test Results (En 55022) Section; Radiated Emissions Test Results (En 55022) - Analog Devices EVAL-ADN4651EB1Z User Manual

UG-900

RADIATED EMISSIONS TEST RESULTS (EN 55022)

NOTES
1. SIGNAL GENERATOR OUTSIDE TEST CHAMBER
2. INPUT SIGNAL: |V
Figure 6. Test Setup for EN 55022 Radiated Emissions Testing for the EVAL-ADN4651EB1Z; Scope and Signal Generator Reversed for the
Radiated emissions testing is performed with the
ADN4651EB1Z and EVAL-ADN4652EB1Z
external test facility. Evaluating the
EVAL-ADN4652EB1Z to the EN 55022 standard is undertaken in
a 10 m radiated emissions test chamber, using the test setup
shown in Figure 6. The setup comprises a battery-powered
EVAL-ADN4651EB1Z/EVAL-ADN4652EB1Z
signal generator located outside the chamber via coax 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 unit 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 for EVAL-ADN4651EB1Z
ADN4652EB1Z are shown in Table 4 and a classification report
for both evaluation boards is available on request (please contact
Analog Devices or the distributor for support). Radiated emissions
are measured across 30 MHz to 1 GHz and from 1 GHz to 3 GHz.
EVAL-ADN4651EB1Z/EVAL-ADN4652EB1Z User Guide
SIGNAL
10m COAX CABLE ×2
GENERATOR
| = 300mV, V = 1.1V, 600MBPS PRBS7 OR 300MHz CLOCK
ID IC
EVAL-
at an independent
EVAL-ADN4651EB1Z and
connected to a
and EVAL-
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-ADN4651EB1Z
J22
R12 R11
J24
With a 600 Mbps PRBS7 input, the
ADN4652EB1Z
horizontal and vertical peak radiated emissions below 1 GHz are
shown in Figure 7 and Figure 8, respectively, for the
ADN4651EB1Z; see the classification report for the
ADN4652EB1Z
With a 300 MHz clock input, the
ADN4652EB1Z
Class B limits when isolating high frequency clocks, reduce the
printed circuit board (PCB) clearance from the 8 mm implemented
on the EVAL-ADN4651EB1Z/EVAL-ADN4652EB1Z
example, 2 mm.
Table 4. EN 55022 Radiated Emissions Classification
Test Condition
600 Mbps PRBS
300 MHz Clock
Rev. A | Page 6 of 13
2 × AA BATTERY
3V TO 3.15V
J10
V
IN2
V
DD2
J5
P7
R7
J6
R8
R5
J7
R6
J8
GND2
J21
R10 R9
J23
EVAL-ADN4652EB1Z
EVAL-ADN4651EB1Z/EVAL-
passes the EN 55022 Class B limits. Plots for
plots.
EVAL-ADN4651EB1Z/EVAL-
passes the EN 55022 Class A limits. To pass the
Result
Passes EN 55022 Class B
Passes EN 55022 Class A
EVAL-
EVAL-
to, for