Analog Devices DC3126A Demo Manual page 6

DEMO MANUAL DC3126A
TYPICAL PERFORMANCE CHARACTERISTICS
Radiated EMI Performance – Horizontal Polarization
(CISPR25 Radiated Emission Test with
Class 5 Peak Limits)
50
45
40
35
30
25
20
15
10
5
0
–5
–10
0 100 200 300 400
FREQUENCY (MHz)
Figure 4. LT8686S Demo Circuit EMI Performance in CISPR25 Conducted and Radiated Emission Test
(VEMI = 14V, V
6
Conducted EMI Performance
60
50
40
30
20
10
0
–10
–20
0.1
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
500 600 700 800 900
dc3126a F04b
= 5V, V = 3.3V, V
OUT1 OUT2 OUT3
V and V ), I = I
IN3 IN4 OUT2 OUT3
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
1 10
FREQUENCY (MHz)
Radiated EMI Performance – Vertical Polarization
(CISPR25 Radiated Emission Test with
50
45
40
35
30
25
20
15
10
5
0
–5
–10
1000 0 100 200
= 1.8V, V = 1.2V, I
OUT4 OUT1
= I = 2A, 2MHz Switching Frequency)
OUT4
100
dc3126a F04a
Class 5 Peak Limits)
CLASS 5 PEAK LIMIT
SPREAD SPECTRUM MODE
FIXED FREQUENCY MODE
300 400 500 600 700
FREQUENCY (MHz)
= 2A (Includes Current Supplying
800 900 1000
dc3126a F04c
Rev. 0