
V1.4 September 2006
Data Sheet
Ag2130
LOW COST PSTN INTERFACE
1.0 Pin Description
1.1 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.
Anode.
For power cross protection connect to protection device
anode.
4
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.
DC Mask a.
A resistor is connected between this pin and DMb to
adjust the d.c. characteristics of the termination.
7
DMa
8
nc
No connect.
This pin is not used and can be left open circuit.
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.
Audio Out.
This is the analog output signal (from Tip and Ring) to the
Codec. Connected via a 100nF capacitor.
Loop switch control.
Applying a logic 1 closes the integral loop
switch.
10
V
OUT
11
LSC
12
GND
Analog ground.
Normally connected to system ground.
13
V
CC
Positive supply.
Must be connected to +5V or +3.3V.
14
nc
No connect.
This pin is not used and can be left open circuit.
15
Z
B
Balance network.
The network balance matching components are
connected between this pin, V
IN
and GND.
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 Z
B
.
2 Wire matching network 1.
The 2 wire impedance matching network
is connected between this pin and Z
T2
.
Ringing signal.
A logic 0 indicates the presence of ringing voltage on
the telephone line. Toggles at ringing frequency.
Reference voltage output.
Used with V
TR
to detect parallel phone.
V
REF
is approximately +V
CC
/2. Connect 100μF to GND from this pin.
Tip/Ring voltage.
Indicates the voltage between Tip/Ring. Divided by
220 and relative to Vref.
16
Z
T2
17
Z
T1
18
RS
19
V
REF
20
V
TR
Silver Telecom 2006
3