2-Channel Headset/Microphone EMI Filter - ON Semiconductor
Description
CM1412
2-Channel Headset / Microphone EMI Filter Array with ESD Protection
Product Description
The CM1412 is a dual, low−pass filter array integrating two pi−style filters (C−R−C) that reduce EMI/RFI emissions while providing ESD protection.
This part is custom−designed to interface with a microphone port on a cellular telephone or similar device.
Each high quality filter provides more than 35 dB attenuation in the 800 to 2700 MHz range.
These pi−style filters support bidirectional filtering that control 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 ±8 kV, the maximum requirement of the IEC 61000−4−2 international 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 ±15 kV.
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 OptiGuardt coating which results in improved reliability at assembly and is available in a space−saving, low−profile Chip Scale Package with lead−free finishing.
http://onsemi.
com
WLCSP5 CP SUFFIX CASE 567AZ
BLOCK DIAGRAM
A1 MIC_IN1
A3 MIC_IN2
GND B2
68 W R
47 pF 47 pF
C
C
68 W R
47 pF 47 pF
C
C
C1 MIC_OUT1
C3 MIC_OUT2
Features
• Functionally and Pin Compatible with ON Semiconductor’s
CSPEMI202A
• OptiGuardt 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 40 dB Attenuation at 1 GHz • ±8 kV ESD Protection on Each Channel
(IEC 61000−4−2 Level 4, Contact Discharge)
• ±15 kV ESD Protection ...
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