TCM series
1005,1210,1608, 2010 type
TDK CORPORATION
13
TCM
Eye pattern of data signal
Comparison (before/after countermeasure)
400bps
Radiation electric
field intensity
Comparison
(before/after
countermeasure)
S400
Speed Signal
(TPB)
IEEE Terminal
HDD
One-Chip
Micro
Computer
for IEEE1394
TPA
TPB
TPA
TPB
IEEE1394 Cable 4.5m
IDE HDD
Tektronix TDS7254
FET Probe P72400
Differential Probe P7330
TCM2010
500ps/div
100mV/div 500ps/div
Initial condition(Through)
With TCM2010-201-4P
There is no deformation or degradation of eye pattern.
70
60
50
40
30
20
10
0
100
1000
Frequency (MHz)
10
Horizontal
Vertical
Initial condition(Through)
With TCM2010-201-4P
70
60
50
40
30
20
10
0
100
1000
10
Initial condition(Through)
With TCM2010-201-4P
Resolution:1600 x 1200(UXGA)
A large suppressive
effect was gained for,
in particular,
the fundamental
wave and harmonic
component of
IEEE1394(S400) signal
200MHz.
50nsec/div
Tp
+
,Tp
-
(V)
2.5
2
1.5
1
0.5
Aside from the eye-pattern waveform, the essential consideration
in selecting a common-mode filter for the IEEE1394 interface line is
the level of effect on the speed signal waveform. This signal is sent
to detect data transmission speed (100, 200, and 400Mbps).
But because it is sent in the common mode, it is an essential control
factor to set a common-mode impedance value that will not sig-
nificantly distort the waveform. As shown in the measurement data
on the left, the TCM series has achieved a superb characteristic in
this regard.
Initial condition
(Through)
With TCM2010-201-4P
TCM2010-201-4P
100mV/div
IEEE1394 differential signal waveform actual
measurement example/Speed Signal waveform
EMI countermeasure example
TCM2010
IEEE1394 interfaces
Radiation
electric
field
intensity
(dB
V
/m)
Radiation
electric
field
intensity
(dB
V
/m)