CH1840D ET Cermetek Microelectronics, CH1840D ET Datasheet - Page 7

• Manufacturer Part Number: CH1840D ET
• Manufacturer: Cermetek Microelectronics

Specifications of CH1840D ET

• Operating Temperature Classification: Industrial
• Pin Count: 12
• Lead Free Status / RoHS Status: Supplier Unconfirmed

Cermetek Microelectronics, Inc.
Figure 4
1. RJ-11 Jacks must be provided by one of the
2. Current Line Device: F1 and F2 – 1.25amp.
3. Over Voltage and Lightning Protection.
©2009 Cermetek Microelectronics, Inc.
vendors on the list.
#130, Summary of Recommended Suppliers.
A. UL 1459 must use a current limit device. A
B. Resistors (10ohm carbon film or SMD 1/8W
A. DOC (Canada) may require external current
Poly Fuse is recommended as this device
resets automatically after each power surge.
minimum)
applications.
limiting devices. Use 1ohm resistors (carbon
film or SMD parts 1/8W minimum) in each lead
(TIP and RING). You may substitute fuses or
the Poly Fuse described in Section 2.
Telephone Line Interface.
may
Refer to Application Note
be
used
for
non
UL
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4. EMI/RFI Suppression.
B. For lightning prone areas where there are
The capacitor/ inductor network should be located
as close to the RJ-11 Jack as possible with an
excellent ground path to the chassis. Capacitors
C1 and C2 should not exceed 0.005µF.
must have a rating of 1.5KV and typically have a
value of 0.001µF ± 20%. Inductors L1 and L2 are
ferrite cylinders and provide attenuation to high
frequencies
external to the CH1840. The required values must
be empirically determined for each product design
more than 2 storms per year, provide an earth
ground connection and use a three terminal
sidactor or similar device that provides metallic
and longitudinal protection.
include the current protection in Section 2.
CH1840 Family of Low Profile DAA Modules
from
Document No. 607-0011 Revision C (09/09)
system
level
This must also
components
They