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參數資料
| 型號： | AG2130 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LOW COST PSTN INTERFACE |
| 中文描述： | 低成本PSTN接口 |
| 文件頁數： | 6/11頁 |
| 文件大小： | 198K |
| 代理商： | AG2130 |
V1.4 September 2006
Data Sheet
Ag2130
LOW COST PSTN INTERFACE
Ag2130 can receive signals when on-hook, presenting
a high impedance to the line. I.e. whilst drawing a very
small current (5
μ
A approx) from the line.
3.5
Ringer Load Networks
The “dummy ringer” is usually a capacitive/resistive
load which is connected across TIP/RING. During a
call it is of sufficiently high impedance not to affect the
operation of the interface. The Ag2130 meets the
dummy ringer requirements for CTR21 (Europe), USA
and Asia.
4.0
Device Protection.
Like many of the performance requirements which the
Ag2130 must meet, protection for the interface is
dependent upon regulatory standards in the market in
which the equipment is deployed. Some examples are
given below, but these are not exhaustive.
For a more comprehensive overview of protection for
line interfaces, refer to our Over-voltage Protection
Applications Note. This is may be downloaded from the
Silver Telecom web-site (www.silvertel.com) or will be
provided by our local representative.
4.1
FCC Pt 68 Requirements.
To withstand the FCC Pt68 longitudinal voltage surge
of 1500V no protection is required, as the barrier will
withstand 1500V peak voltage to GND.
To withstand the FCC Pt68 metallic surges at 800V
requires a 130V AC varistor (which clamps at 300V
which is the maximum rating of the loop switch
transistor). A 14mm device should be used to
withstand the two 100A 10/560us surges.
Examples of suitable devices are:-
Joyin JVR-14N201K;
Walsin VZ14D201KBS
Note: If varistors to ground are used for added
protection (e.g. more than 1500V) customers should be
aware that the FCC test generator for longitudinal tests
is rated at up to 1000A. 10
,
2W wire wound surge
limiting resistors will also be needed.
4.2
EN/UL60950 Protection.
To meet the EN/UL60950 mains cross test 22
,
2W
wire wound surge resistors and 0.35A special fuses
(Bussman C515 or Littelfuse 220003) in a balanced
configuration are required. Alternatively a Teccor
F1250T fuse may be used without surge limiting
resistors.
It is also possible to use PTC thermistors to meet these
tests. The Raychem TR600-150 is designed for this
application. See Raychem Application Notes for further
details. A typical application is shown in figure 6a.
4.3
Other Standards.
The Ag2130 has provision for low cost mains cross
protection (CCITT K21): a 47
,
2W wire wound surge
resistor and a PTC thermistor are sufficient to meet
regulatory approvals. A suitable device is the Walsin
RS
LSC
LOUT
LIN
Interface
T E L E C O
T E L E C O M
C1
C2
Ag2130
AGPIO
DSP
R1 = 390k
Z
B1
= 100k
Z
T
= 300
Z
= 47K
C1, C2, C4 = 100nF
C5 = 10uF
Typical protection:
X1 = TVB200SA (Raychem)
REF
TR
V
IN
V
OUT
Z
B
DMa
DMb
TIP
RING
GND
R1
Processor
Protection Circuit
V
CC
Protection circuit depends
upon precise application
V
CC
Silver
Z
B1
C4
C5
X1
VoicePump
VP140
For 600R line and balance impedance:
, C6 = 100uF
PTC = TR600
-
150 (Raychem)
+
PTC
Z
C
Z
T
Z
T1
Z
T2
VoicePump DSP shown for illustration
purposes. Ag2130 can interface to any codec
V
TR
V
REF
GND
+
C6
Figure 4: Typical Application
Silver Telecom 2006
6
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