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CM1412 Datasheet, PDF (1/6 Pages) California Micro Devices Corp – 2 Channel Headset Microphone EMI Filter with ESD Protection | |||
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CM1412
2 Channel Headset Microphone EMI Filter with ESD Protection
Features
⢠Functionally and pin compatible with CMDâs
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 signalsâideal 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
Applications
⢠EMI filtering and ESD protection for headset
microphone ports
⢠Wireless Handsets
⢠Handheld PCs / PDAs
⢠MP3 Players
⢠Digital Camcorders
⢠Notebooks
⢠Desktop PCs
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 OptiGuardâ¢
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.
Electrical Schematic
MIC_IN1 A1
MIC_IN2 A3
B2
GND
68Ω
47pF
47pF
68Ω
47pF
47pF
C1
MIC_OUT1
C3
MIC_OUT2
© 2005 California Micro Devices Corp. All rights reserved.
11/03/05 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 â Tel: 408.263.3214 â Fax: 408.263.7846 â www.calmicro.com 1
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