INNOVATIVE INDUCTOR-BASED
Praetorian III
®
EMI FILTERS WITH ENHANCED
ESD PROTECTION
Lower total line capacitance low pass filters for standard parallel interfaces permit
excellent EMI suppression at lower operating voltages
• Low line capacitance, supporting low
voltage and drive level interfaces
• Attenuation from 700 MHz to 6 GHz
enveloping all active handset
frequencies
Because the CM1693 is an inductor-
based, low-pass filter, rise and fall times
are significantly faster than traditional
RC-based filters. This has proven to be
an important consideration for digital
The CM1693 represents the first in a family
of general and special purpose low-pass
filter products featuring
Praetorian III
signal integrity. Additionally, because the
CM1693 is an inductor-based solution, the
attenuation mask has very little sensitivity
to DC bias.
By meeting or surpassing the system
attenuation requirements of current and
antcipated future CMDA and E-GSM
protocols, and supporting the faster clock
speed and higher frequency cutoff needs
of high resolution cameras, high-density
removable storage, and high resolution
displays, the CM1693 is primed to become
the EMI filter of choice for handset
The CM1693 is the first product on the
market to use a coupled or (stacked)
inductor to create low-pass filters. The
CM1693 attenuates signals starting in the
700 MHz band, an important consideration
for designers of CDMA, E-GSM, and
eventually LTE. The CM1693 also provides
the following key performance features:
• Frequency rolloff starting at 300 MHz,
supporting clocks up to 96 MHz
• Rise/fall times as fast as 4 nSec
• Integrated +/- 18kV contact ESD
protection
The CM1693 is designed to meet the needs
of today’s data-rich multimedia ecosystem
for wireless handsets.
Handset Feature
Camera
Display
Removable Memory
Supports
> 3.2M
> QVGA
> 4GB
...........
...........
...........
...........
...........
...........
...........
CM1693 VALUE PROPOSITION
Uses
new
Praetorian
space,
III
architecture
and
cost
with a 4-pole configuration integrating
performance,
optimization.
• Rolloff frequencies: up to 300 MHz
supporting clock frequencies up to
96 MHz
• Sharp rise times through the filter
• Broadband attenuation in the carrier
bands (from about 700 MHz up to
6 GHz)
• Lowest total line capacitance
• Less susceptibility to mask-shifting DC
bias
• Integrated, silicon-based ESD
protection, which does not degrade
over time
• Deep levels of attenuation and high
signal-to-nose ratios
PERFORMANCE WITHOUT
COMPROMISE
The CM1693 family’s advanced C-L-L-C
architecture (12pF-26nH-10F per channel)
provides 4, 6, and 8 channel configurations
to enable maximum layout and placement
flexibility (see Table 1). The CM1693
achieves fast rise times, deep attenuation
in the wireless handset frequencies and
provides robust ESD protection.
▲
WIRELESS
CM1693
technology for the emerging high speed
interface requirements of wireless handset
applications.
Praetorian III
pass filters with high cutoff
is a patent-
and rolloff
pending architecture for creating low-
frequencies, close-in stop bands, low total
line capacitance, and very steep attenuation
curves (-18dB/octave).
DC bias.
Praetorian III
devices also maintain the stopband over
designers.
INNOVATIVE INDUCTOR-BASED
Praetorian III
®
EMI FILTERS WITH ENHANCED ESD PROTECTION
Product
CM1693-04DE
CM1693-06DE
CM1693-08DE
Number of
Channels
4
6
8
Package Dimension ( L X W X H )
uDFN, 1.70mm (L) x 1.35mm (l) x 0.50mm (H),
0.40mm pitch
uDFN, 2.50mm (L) x 1.35mm (l) x 0.50mm (H),
0.40mm pitch
uDFN, 3.30mm (L) x 1.35mm (l) x 0.50mm (H),
0.40mm pitch
bandwidth data interfaces not served by
lower performance resistor-capacitor (RC)
based filters.
Praetorian III
is the third generation of
innovation in low-pass filters with integrated,
silicon-based ESD protection.
Praetorian
III
uses a coupled-inductor approach
to create low pass filters.
Praetorian III
devices (like the CM1693) offer lower total
line capacitance than previous
Praetorian
products and up to one-third the total line
capacitance over comparable RC-based
products.
Table 1. CM1693 Product Family Summary
Figure
1
shows
High
typical
rolloff
(measured)
frequencies
INSERTION LOSS
RF Performance
0 dB
performance of the CM1693 in application
environments.
-10 dB
are demonstrated (>300MHz at -6dB),
with a steep rolloff slope (-18dB/octave)
and deep broadband attenuation (below
-40dB at 900 MHz). This results in excellent
signal integrity in the time domain and
helps preserve sharp rise with minimal
propagation delay through the filter. These
performance characteristics help make the
CM1693 the best option over competing
solutions such as discrete, ceramic L-C
filters. Because the CM1693 is a silicon-
based solution, there is very little filter
performance variation from channel-to-
channel. In addition to high-performance
filtering, each channel provides robust ESD
protection up to ±18kV contact discharge
per IEC61000-4-2 Level 2 specification.
-20 dB
-30 dB
1.5V Bias
0V Bias
-40 dB
APPLICATIONS
The filter characteristics of the CM1693
3
10
100
FREQUENCY (MHz)
1000
2000
6000
-50 dB
product family represent a perfect fit to
protecting interfaces providing high data
rates that are connected to modules
requiring very low input rise times, very
low line capacitance, and very fast clocks.
Applications such as removable memory,
camera interfaces, and display interfaces
can confidently adopt the CM1693 to
address their EMI and ESD issues.
CONCLUSION
California Micro Devices’ CM1693 family
continues the commitment to providing
high
performance
EMI
suppression,
superior signal integrity, and robust ESD
protection at a cost-effective price.
Figure. 1 Typical (Measured) CM1693
Performance in Real Applicaiton
Environment
Praetorian
EVOLUTION
Praetorian I
technology, which was released
in 2006, provided the first LC filter designed
for handset applications.
Praetorian I
delivered superior performing EMI filters
using copper and aluminum coils implanted
into the silicon.
Praetorian II
used a single layer aluminum
to create a value-added product at a cost
lower than the ground breaking
Praetorian
I
filters.
Praetorian II
also allowed mobile
handset designers to address many higher
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Tel +813 5322 2910
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Contact: Mr. Hiroki Teraoka
Email: hirokit@cmd.com
(Distributor Stamp)
© 2009 California Micro Devices Corporation All rights reserved. The CMD logo,
Praetorian®, Praetorian II®
and
Praetorian III®
are registered trademarks of
California Micro Devices Corporation. Other company, product and service names may be trademarks or registered trademarks of others.
Specifications subject to change without notice. (Order Code: camdtda0040 / 02.09)
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