Datasheet

Chip Ferrite BeadChip EMIFILr
Chip Common Mode Choke Coil
Block Type EMIFILrMicrowave Absorber
!Note
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C31E.pdf
09.4.20
137
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Frequency (MHz)
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Frequency (MHz)
DLW21SN900HQ2 DLP11SA900HL2
Noise
Suppression
Example
Skew Improve Effect of Common Mode Choke Coil
Example of Skew Improvement by Common Mode Choke Coil
(Test using pulse generator waveform)
Waveform is equivalent to 1000Mbps signal
Waveform with intentionally made skew (skew: 100ps) Skew is improved by common mode choke coil
Mechanism of Skew Improvement
Waveform rises (or falls)
Current change generates
magnetic flux on a ferrite core
Electromotive force is
generated on another line
This electromotive force works to
decrease the delay of waveform
Noise Suppression of Common Mode Choke Coil in HDMI Line
Device under test / Transmitter : game machine Receiver : projector
Cable / HDMI categoly2 3m cable
Test resolution / 1080p Deep color 12bit (Data 1.11GHz) DVD play mode
Without filter Without filter
Test Example of HDMI1.3
Waveform Transmission
~Using ESD protection device 0.05pF~
Signal frequency : 1.11GHz (Deep color 12bit)
CLOCK
DATA
Transition Time
Rise time: 83.4ps
Fall time: 77.4ps
Rise time: 90.4ps
Fall time: 85.5ps
Rise time: 100ps
Fall time: 97.4ps
Video signal generator
common mode choke coil ESD protection device 0.05pF
ESD protection device only
with film type DLP11SN900HL2
(Cut-off frequency is most low in the table below)
Cut-off Frequency
Judge
Wound Type
DLW21SN900HQ2
Film Type
DLP11SA900HL2
Film Type Array
DLP2ADN900HL4
Over 10GHz
Around 6GHz
Around 4GHz
Specification satisfied Specification satisfied Specification satisfied
Specification
satisfied
Each of common mode choke coil can keep waveform, satisfy the specification.
Noise Level (dBµV/m) Noise Level (dBµV/m)
DLP/DLW Series