CM1412
2 Channel Headset Microphone EMI Filter with ESD Protection
Features
Product Description
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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
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.
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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.
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5-bump, 0.930mm X 1.410mm footprint
Chip Scale Package (CSP)
Lead-free version available
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
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.
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Electrical Schematic
68
Ω
Ω
C1
A1
MIC_IN1
MIC_OUT1
47pF
47pF
47pF
68
C3
A3
MIC_IN2
MIC_OUT2
47pF
B2
GND
© 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
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