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CM1421

4-Channel LCD EMI Filter Array plus 4-Channel ESD Protection Array

California Micro Devices Corp 

CM1421

4-Channel LCD EMI Filter Array plus

4-Channel ESD Protection Array

Features

• Functionally and pin compatible with CMD’s

CSPEMI607

• Four channels of combined EMI/RFI filtering plus

ESD protection

• Four additional channels of ESD-only protection

• Better than 30dB attenuation (typical) at 1 GHz

• ±15kV ESD protection on all channels

(IEC 61000-4-2 Level 4, contact discharge)

• ±30kV ESD protection on all channels (HBM)

• Chip Scale Package features extremely low

lead inductance for optimum filter and ESD

performance

• 15-bump, 2.960mm X 1.330mm footprint

Chip Scale Package (CSP)

• Optiguard™ coated for improved reliability

• Lead-free version available

Applications

• LCD data lines in mobile handsets

• EMI filtering and ESD protection for both data and

I/O ports

• Mobile Handsets

• Handheld PCs / PDAs

• Notebook Computers

Product Description

The CM1421 is a multichannel array consisting of four

low-pass filters with integrated ESD protection and four

ESD-only protection channels designed to reduce EMI/

RFI emissions on LCD data lines in mobile handsets.

The CM1421 has component values of 15pF-100Ω-

15pF. These devices include ESD protection diodes on

every pin, which provide a very high level of protection

for sensitive electronic components that may be sub-

jected to electrostatic discharge (ESD). The ESD

diodes connected to the filter ports are designed and

characterized to safely dissipate ESD strikes of ±15kV,

beyond 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 pins are protected for contact dis-

charges 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 format and easy-

to-use pin assignments. In particular, the CM1421 is

ideal for EMI filtering and protecting data lines from

ESD for the LCD display in clamshell handsets.

The CM1421 incorporates Optiguard™ coating which

results in improved reliability. The CM1421 is available

in space-saving, low-profile chip-scale packages with

optional lead-free finishing.

Electrical Schematic

FILTER+ESDn*

100Ω

15pF

15pF

FILTER+ESDn*

ESDn*

15pF

GND

(Pins B1-B3)

1 of 4 EMI/RFI + ESD Channels.

1 of 4 ESD-only Channels

* See Package/Pinout Diagram for expanded pin information

© 2004 California Micro Devices Corp. All rights reserved.

04/27/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com

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