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參數資料
| 型號： | AG2120 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FULLY FEATURED PSTN INTERFACE |
| 中文描述： | 全功能PSTN接口 |
| 文件頁數： | 7/14頁 |
| 文件大?。?/td> | 256K |
| 代理商： | AG2120 |
V2.0 October 2002
Advance Data Sheet
Silver Telecom 2002
Page 7
Ag2120
FULLY FEATURED PSTN INTERFACE
Ag2120 can receive signals On-Hook, presenting a
high impedance to the line, i.e. while 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 Ag2120 meets the
dummy ringer requirements for CTR21 (Europe), USA
and Asia.
4.0
Device Protection.
As with many of the requirements which must be met
by the Ag2120 the device protection 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 refer
to the Silver Telecom protection applications note,
which is available directly form Silver Telecom, via our
web-site (www.silvertel.com), or through 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 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
UL1459 and UL1950 Protection.
To meet the UL1459 and UL1950 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 Ag2120 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
PTD3A350H26. (Metallic protection with a single
device is all that is required as the Ag2120 will
withstand longitudinal voltages up to 1000Vrms to
ground without additional protection).
As an option, for improved off-hook power cross
Figure 5: Typical Application
V
IN
V
OUT
RS
LC
LSC
F/R
Z
b
DMa
DMb
TIP
RING
GND
R1
LOUT
LIN
Processor
Interface
Protection Circuit
V
CC
0V
Protection circuit depends
upon precise application
V
CC
T E L E C O M
Silver
+
Z
b2
Z
b1
C3
C1
C2
C4
C5
PTC
X1
Ag2120
AGPIO
VoicePump
VP140 DSP
For 600R line and balance impedance:
R1 = 390k
Z
b1
= 100k
Z
b2
= 0R
Z
T
= 300
Z
C
= 47k
C1, C2, C4 = 100nF
C3 = NF
C5 = 10uF
Typical protection:
PTC = TR600-150 (Raychem)
X1 = TVB200SA (Raychem)
Z
C
Z
T
Z
T1
Z
T2
VoicePump DSP shown for illustration
purposes. Ag2120 can interface to any codec
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