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ECMFTM series portfolio overview
Common-mode filters embedding ESD protection
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Overview
Basic
In depth
2
Purpose of common-mode filtering
• When subjected to common-mode noise, high-speed differential lines generate
unwanted radiated noise.
• Common-mode filters prevent differential lines from radiating and interfering
with other RF signals nearby.
Differential transmission
Radiated
noise is generated !
NO radiated noise
CMF
Emitter
X
Receiver
D+
D-
D1+
D1+
D1-
D1-
CMF symbol
Conduction noise
Ex : internal clock, …
Coupled noise
Ex : RF spike
Common mode sources
Noise + Skew
Ex : +100 ps on D-
3
Troubleshooting antenna desense
• The sensitivity of reception antennas is degraded by radiated noise from high-speed data
lines when there is:
• Proximity between the 2 elements
• Radiated common-mode noise at the antennas reception frequency spectrum
• By eliminating radiated common-mode noise, ECMF™ preserves the antenna sensitivity.
Example with Wi-Fi antenna / USB 3.0 port:
Without ECMF
Antenna wifi
With ECMF
Antenna wifi
D+
D+
D-
D-
X
CMF
High speed differential line
E.g. : USB3.0
Degraded sensitivity
Loss of connection
High speed differential line
E.g. : USB3.0
Sensitivity preserved
4
Think CMF…
When you have to implement high-speed lines
in your RF system, you need to think CMF
High-speed lines
Antenna
CMF
D-
•
•
•
•
•
•
MIPI
SATA
HDMI
DisplayPort
USB 2.0
USB 3.1
X
D+
Avoid desense
•
•
•
•
•
•
•
Wi-Fi
Bluetooth
GPS
WCDMA
LTE
Sub-GHz
ZigBee
5
… With integrated ESD protection
ESD protection
CMF
(Common-mode filter)
Low dispersion semiconductor
process
Advanced technology for
optimized performances
Very small size
High and deep rejection
Low clamping voltage
ECMFTM
6
Selection guide – ECMF™
DIFFERENTIAL BANDWIDTH
Peak rejection
frequency (> -20 dB)
(GHz)
Number
of lanes
complies with the following
standards
Part number
Speed Class 1
•
•
•
•
•
MIPI D-PHY (DSI & CSI)
USB 2.0, MHL 2.0
HDMI 1.4
DisplayPort™
SATA
1
2
3
0.70.9
ECMF02-3F3


ECMF02-2BF3


ECMF02-4CMX8

ECMF02-2HSMX6
1.5
1.82.4
ZCC21
@ 100 MHz
(Ω)
5
Speed
class
I
Package
type
Package size
XY
(mm)
II
24

Flip-Chip
0.83 x 1.33

14

Flip-Chip
0.83 x 1.23


16

µQFN-8L
1.20 x 2.50



µQFN-6L
1.50 x 1.70
ECMF02-2AMX6



µQFN-6L
1.50 x 1.70
ECMF02-3HSM6


30
 (*)
µQFN-6L
1.35 x 1.60

30
 (*) µQFN-10L
1.35 x 2.60
Speed Class 2
•
•
•
•
•
Speed Class 1
interfaces
MIPI M-PHY (DSI & CSI)
USB 3.0
USB 3.1
HDMI 2.0
ECMF04-4HSM10

ECMF04-4HSWM10

ECMF04-4AMX12



ECMF06-6HSM16


ECMF06-6AM16




16



50


30
16

30


15

µQFN-10L
1.35 x 2.60
µQFN-12L
1.50 x 3.30
 (*) µQFN-16L
1.35 x 4.10
µQFN-16L
1.35 x 3.30
7
Let’s go further
Basic presentation
Intermediate product presentation soon available:
‘Understanding ST’s ECMF™ series specification’
Application Notes:
In-depth information



Common-mode filters (AN4511)
Antenna desense on handheld equipment (AN4356)
MHL filtering and protection (AN4540)
Models - S parameters
Selection
 Selection guide [pdf]
 www.st.com/ecmf-ipad
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9
Thank you