PRELIMINARY
CM1418
Praetorian™
L-C EMI Filter with ESD Protection
for Headset Speaker Applications
Features
•
•
•
•
•
•
•
•
2 channels of EMI filtering
±
30kV ESD protection
(IEC 61000-4-2, contact discharge)
±
30kV ESD protection (HBM)
OptiGuard
™
Coating for improved reliability at
assembly
Greater than 35dB of attenuation at 1GHz
6-bump, 1.720mm x 1.220mm footprint Chip Scale
Package (CSP)
Lead-free version available
Product Description
California Micro Devices’ CM1418 is an L-C EMI filter
array with ESD protection, which integrates two Pi-
filters (C-L-C) for the headset speaker. The CM1418
has component values of 117pF-3.0nH-117pF. The
parts include ESD protection diodes on all input/output
pins, which provide a very high level of protection for
sensitive electronic components that may be subjected
to electrostatic discharge (ESD). The ESD diodes
connected to the filter ports safely dissipate ESD
strikes of
±
30kV, beyond the maximum requirement of
the IEC61000-4-2 international standard. Using the
MIL-STD-883 (Method 3015) specification for Human
Body Model (HBM) ESD, the pins are protected for
contact discharges at greater than
±
30kV.
This device is particularly well suited for portable
electronics (e.g. mobile handsets, PDAs, notebook
computers) because of its small package format and
easy-to-use pin assignments.
In particular, the
CM1418 is ideal for EMI filtering and protecting
speaker output lines from ESD for the headset speaker
in mobile handsets. Most speakers have impedance of
8
Ω
and in order to maximize the power output, the
resistance of an EMI filter needs to be as low as
possible and the CM1418 addresses this by having a
C-L-C based EMI filter where the inductor has less
than 0.35
Ω
of resistance.
The CM1418 is available either uncoated or with
Opti-
Guard
™
coating resulting in improved reliability at
assembly. The CM1418 is also available in a space
saving, low profile Chip Scale Package with optional
lead-free finishing.
Applications
•
•
•
Headset Speaker port in mobile handsets
I/O port protection for mobile handsets, notebook
computers, PDAs etc.
EMI filtering for data ports in cell phones, PDAs or
notebook computers.
Electrical Schematic
FILTER #1
A1
3nH
A3
117pF
FILTER #1
117pF
GND
FILTER #2
A2
B1
3nH
B3
117pF
FILTER #2
117pF
GND
B2
© 2005 California Micro Devices Corp. All rights reserved.
12/13/05
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
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Fax: 408.263.7846
●
www.cmd.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
