The CYG2911 is a Data Access Arrangement (DAA) mod-
ule providing a complete telephone line interface circuit in
a small 1.07" x 1.07" x 0.4" plastic package. This module
incorporates a circuit which signals HIGH when another
phone in parallel has been taken off-hook when the
CYG2911 is off-hook. This feature is important for cable
TV set-top boxes and direct broadcast satellite units
which must hang-up (go on-hook) when a consumer
needs the phone line to place a 911 or emergency call.
The module is designed to meet FCC Part 68 require-
ments thus providing a low-risk design solution.
Applications
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Home medical devices
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Plant monitoring equipment
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Security/alarm systems
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Utility meters
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Network routers
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PBX systems
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Telephony applications
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Set top boxes
Approvals
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UL 1950/UL1459
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Compatible with U.S. and Canadian phone lines
Ordering Information
Part #
CYG2911
Description
DAA Module
Block Diagram
CYG2911
LINE 1
LINE 2
1
2
GYRATOR/
CALLER ID
RING
R_LIM
18
17
470鈩?V
CC
V
CC
GND
HOOKSWITCH
14
13
911
CID1
CID2
911
OH
RING
7
8
9
200k
47k
R_LIM
V
CC
V
CC
RING
SURGE
DETEC- PROTEC-
TION
TION
11
10
TIP
RING
RING
Handling and Assembly Recommendations
The CYG2911 products are not hermetically sealed and should not be exposed to any liquid-based rinsing processes. Clare recommends two (2) approaches. The modem
should either use a no clean soldering flux that would mostly evaporate during the normal wave soldering processes, or be soldered in by hand after the rest of the card
1
2
3
4
