Linear Technology LTM2883-3I I2C µModule Isolator Demo Board (3.3V Supply) DC1748A-C DC1748A-C 데이터 시트
제품 코드
DC1748A-C
3
dc1748af
DEMO MANUAL DC1748A
OPERATING PRINCIPLES
Figure 1. DC1748 Radiated Emissions
EMI performance is shown in Figure 1, measured using
a Gigahertz Transverse Electromagnetic (GTEM) cell and
method detailed in IEC 61000-4-20, “Testing and Mea-
surement Techniques – Emission and Immunity Testing
in Transverse Electromagnetic Waveguides”.
a Gigahertz Transverse Electromagnetic (GTEM) cell and
method detailed in IEC 61000-4-20, “Testing and Mea-
surement Techniques – Emission and Immunity Testing
in Transverse Electromagnetic Waveguides”.
The demo circuit includes provisions for programming
the three output voltage rails. Resistors R5, R6, and R7
allow the V
the three output voltage rails. Resistors R5, R6, and R7
allow the V
+
, V
–
, and V
CC2
power rails, respectively, to
be reduced from their nominal operating voltages. The
formulas presented in Table 3 allow selection of the ap-
propriate resistor values.
formulas presented in Table 3 allow selection of the ap-
propriate resistor values.
Table 3.
VOLTAGE RAIL
RESISTOR TO REDUCE OUTPUT
V
+
R5 = 150k • (V
+
– 1.22)/(12.5 – V
+
)
V
–
R6 = 150k • (1.22 + V
–
)/(–12.5 – V
–
)
V
CC2
R7 = 110k • (V
CC2
– 0.6)/(5 – V
CC2
)
FREQUENCY (MHz)
0
–30
dBμV/m
–20
0
10
20
600 700 800 900
60
DC1748A F01
–10
100 200 300 400 500
1000
30
40
50
DETECTOR = QuasiPeak
RBW = 120kHz
VBW = 300kHz
SWEEP TIME = 17s
# OF POINTS = 501
RBW = 120kHz
VBW = 300kHz
SWEEP TIME = 17s
# OF POINTS = 501
DC1748A-A
DC1748A-B
CISPR 22 CLASS B LIMIT