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CX28331 Datasheet(PDF) 58 Page - Synaptics Incorporated.

Part # CX28331
Description  Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
PDF  68 Pages
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Manufacturer  CONEXANT [Synaptics Incorporated.]
Direct Link  https://www.synaptics.com/
Logo CONEXANT - Synaptics Incorporated.

CX28331 Datasheet(HTML) 58 Page - Synaptics Incorporated.

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3.0 Applications
CX28331/CX28332/CX28333
3.1 PCB Design Considerations for CX2833i
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit
3-2
Conexant
100985A
3.1.2 Impedance Matching
It is critical that traces around the transformers and matching resistors be kept to a
minimum length and, in the following cases, the trace impedance be matched to
75
Ω with a
±10% tolerance:
•
The impedance from the BNC connector to the transformer
•
The impedance from the transformer to the matching resistors
3.1.3 Other Passive Parts
The reference design uses the Pulse T3001 extended temperature range 1:1
transformer for the coupling of the BNC connector to the device.
The ferrite beads used to decouple the receive- and transmit-VDD pins on all
analog input VDD pins are type 2508056017Y0 from Fair-Rite Products
Corporation. The bulk capacitor used for where the power enters the board
should be a tantulum–type capacitor, the recommended value and type is a 220 µf
tantulum capacitor.
3.1.4 IBIS Models
IBIS (Input/Output Buffer Interface Specification) models for the
CX28331/CX28332/CX28333-1x and -3x are available from Conexant’s web site
(www.conexant.com).
3.1.5 Recommended Vendors
Product: Transformers
Product: Ferrite Beads
America
Address:
Telo:
Fax:
Pulse
Corporate Office
12220 World Trade Drive
San Diego, CA 92128
858-674-8100
858-674-8262
Telo:
Web site:
Fair-Rite Products Corp.
P.O. Box J
One Commercial Row
Wallkill, NY 12589
914-895-2055
www.Fair-Rite.com
Northern Asia
Telo:
Pulse
3F-4, No. 81, Sec. 1
Hsin Tai Wu Road
Hsi-Chih
Tapei Hsien, Taiwan
R.O.C.
886-2-26980228
886-2-26980948
Product: Crystals
Northern Europe
Telo:
Fax:
Pulse
1S2 Huxley Road
The Surrey Research Park
Guildford, Surrey GU2 5RE
United Kingdom
44-1483-401700
44-1483-401701
Telo:
Fax:
E-mail:
Web site:
Crystek Corp.
12730 Commonwealth Drive
Fort Myers, FL 33913
800-237-3061
941-561-1025
sales@crystek.com
www.crystek.com



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