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CM1440 View Datasheet(PDF) - Allegro MicroSystems

Part Name
Description
Manufacturer
CM1440 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
CM1440
6 Channel EMI Filter Array with ESD Protection
Features
• Six channels of EMI filtering for data ports
• Pi-style EMI filters in a capacitor-resistor-capacitor
(C-R-C) network
±30kV ESD protection on each channel
(IEC 61000-4-2 Level 4, contact discharge)
±30kV ESD protection on each channel (HBM)
• Greater than 35dB attenuation (typical) at 1 GHz
• 15-bump, 0.4mm pitch, 2.360mm x 1.053mm foot-
print Chip Scale Package (CSP)
• Chip Scale Package features extremely low
lead inductance for optimum filter and ESD
performance
OptiGuardcoated for improved reliability at
assembly
• Lead-free version available
Applications
• LCD and Camera data lines 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.
• Wireless handsets
• Handheld PCs/PDAs
• LCD and camera modules
Product Description
The CM1440 is a six channel low-pass EMI filter array
with ESD protection that reduces EMI/RFI emissions
while providing robust protection from ESD strikes.
Each EMI filter channel integrates a high quality pi-
style filter (30pF-100Ω-30pF) which provides greater
than 30dB of attenuation in the 800MHz to 2.7GHz fre-
quency range. The parts include avalanche-type ESD
diodes on every pin, which provide a very high level of
protection for sensitive electronic components that may
be subjected to electrostatic discharge (ESD). The
ESD protection diodes connected to the filter ports
safely dissipate ESD strikes of ±30kV, beyond the
maximum requirement of the IEC61000-4-2 interna-
tional 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 elec-
tronics (e.g. wireless handsets, PDAs, notebook com-
puters) because of its small package and easy-to-use
pin assignments. In particular, the CM1440 is ideal for
EMI filtering and protecting data and control lines for
the I/O data ports, LCD display and camera interface in
mobile handsets.
The CM1440 incorporates OptiGuardwhich results
in improved reliability at assembly. The CM1440 is
available in a space saving, low profile Chip Scale
Package with optional lead-free finishing. It is manu-
factured with a 0.40mm pitch and 0.25mm CSP solder
ball to provide up to 28% board space savings versus
competing CSP devices with 0.50mm pitch and
0.30mm CSP solder ball.
Electrical Schematic
FILTERn*
(Pins A1-A6)
100Ω
30pF
30pF
FILTERn*
(Pins C1-C6)
GND
(Pins B1-B3)
1 of 6 EMI/RFI + ESD Channels
* See Package/Pinout Diagram
for expanded pin information.
© 2005 California Micro Devices Corp. All rights reserved.
11/08/05
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 Tel: 408.263.3214 Fax: 408.263.7846 www.cmd.com
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