CM1412
2 Channel Headset Microphone EMI Filter with ESD Protection
Features
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Functionally and pin compatible with CMD’s
CSPEMI202A
OptiGuard
™
coated for improved reliability at
assembly
Two channels of EMI filtering
Pi-style EMI filters in a capacitor-resistor-capacitor
(C-R-C) network
Greater than 40dB attenuation at 1GHz
+
8kV ESD protection on each channel
(IEC 61000-4-2 Level 4, contact discharge)
+
15kV ESD protection on each channel (HBM)
Supports AC signals—ideal for audio applications
Chip Scale Package features extremely low
lead inductance for optimum filter and ESD
performance
5-bump, 0.930mm X 1.410mm footprint
Chip Scale Package (CSP)
Lead-free version available
Product Description
The CM1412 is a dual low-pass filter array integrating
two pi-style filters (C-R-C) that reduce EMI/RFI emis-
sions while at the same time providing ESD protection.
This part is custom-designed to interface with a micro-
phone port on a cellular telephone or similar device.
Each high quality filter provides more than 35dB atten-
uation in the 800-2700 MHz range. These pi-style fil-
ters support bidirectional filtering, controlling EMI both
to and from a microphone element. They also support
AC signals, enabling audio signals to pass through
without distortion.
In addition, the CM1412 provides a very high level of
protection for sensitive electronic components that may
be subjected to electrostatic discharge (ESD). The
input pins safely dissipate ESD strikes of
+
8kV, the
maximum requirement of the IEC 61000-4-2 interna-
tional standard. Using the MIL-STD-883 (Method 3015)
specification for Human Body Model (HBM) ESD, the
device provides protection for contact discharges to
greater than
+
15kV.
The CM1412 is particularly well suited for portable
electronics (e.g., cellular telephones, PDAs, notebook
computers) because of its small package format and
low weight. The CM1412 incorporates
OptiGuard
™
coating which results in improved reliability at assem-
bly and is available in a space-saving, low-profile Chip
Scale Package with optional lead-free finishing.
Applications
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EMI filtering and ESD protection for headset
microphone ports
Wireless Handsets
Handheld PCs / PDAs
MP3 Players
Digital Camcorders
Notebooks
Desktop PCs
Electrical Schematic
MIC_IN1
A1
47pF
68Ω
C1
47pF
MIC_OUT1
MIC_IN2
A3
47pF
68Ω
C3
47pF
MIC_OUT2
GND
B2
©
2005 California Micro Devices Corp. All rights reserved.
11/03/05
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
