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AG2120 Fiches technique(PDF) 4 Page - List of Unclassifed Manufacturers

No de pièce AG2120
Description  FULLY FEATURED PSTN INTERFACE
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V2.0 October 2002
Advance Data Sheet
© Silver Telecom 2002
Page 4
Ag2120
F U L L Y F E ATUR E D P S TN I N TE RF ACE
1.2 SIL Pin-Out
Pin #
Name
Description
1
RING (B)
Ring. Connects to the subscriber line Ring.
2
TIP (A)
Tip. Connects to the subscriber line Tip.
3
CATHODE
Cathode. For power cross protection connect to protection device
cathode.
4
ANODE
Anode. For power cross protection connect to protection device anode.
5
GATE
Gate. For power cross protection connect to protection device gate.
6
DMb
DC Mask b. A resistor is connected between this pin and DMa to adjust
the d.c. characteristics of the termination.
7
DMa
DC Mask a. A resistor is connected between this pin and DMb to adjust
the d.c. characteristics of the termination.
8
LC
Loop current. A logic 1 Indicates that loop current is flowing.
9
V
IN
Audio In. This is the analog input signal from the Codec (which is output
on Tip and Ring). Connected via a 100nF capacitor.
10
V
OUT
Audio Out. This is the analog output signal (from Tip and Ring) to the
Codec. Connected via a 100nF capacitor.
11
LSC
Loop switch control. Applying a logic 1 closes the integral loop switch.
12
GND
Analog ground. Normally connected to system ground.
13
V
CC
Positive supply. Must be connected to +5V or +3.3V.
14
F/R
Forward/reverse. A logic 1 indicates that the Tip and Ring polarities
are reversed. i.e. Tip is negative with respect to Ring.
15
Z
b
Balance network. The network balance matching components are
connected between this pin, V
IN and GND.
16
Z
T2
2 Wire matching network 2. The 2 wire impedance matching network
is connected between this pin and Z
T1. The compensation impedance Zc
is connected between this pin and Zb.
17
Z
T1
2 Wire matching network 1. The 2 wire impedance matching network
is connected between this pin and Z
T2.
18
RS
Ringing signal. A logic 0 indicates the presence of ringing voltage on
the telephone line. Toggles at ringing frequency.
19
V
REF
Reference voltage. Used with V
TR to detect off-hook parallel phone.
Normally left open circuit. Approx. +1.9V
20
V
TR
Tip/Ring voltage. Indicates the voltage at Tip/Ring. Divided by 50 and
relative to Vref.


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