stlc3075 STMicroelectronics, stlc3075 Datasheet - Page 10

• Manufacturer Part Number: stlc3075
• Description: Integrated Pots Interface For Home Access Gateway And Wll
• Manufacturer: STMicroelectronics

Functional description
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AC characteristics
The SLIC provides the standard SLIC transmission functions.
Once in active mode the SLIC can operate with two different Tx, Rx gains set by the gain set
control bit (See
Table 3.
●
●
●
Once in active mode (D1=1) the SLIC can operate in different states setting properly D0 and
D2 control bits (see also
Table 4.
Polarity reversal
The D2 bit controls the line polarity, the transition between the two polarities is performed in
a ’soft’ way. This means that the TIP and RING wires exchange their polarities following a
ramp transition (see
CREV. This capacitor also sets the shape of the ringing trapezoidal waveform. When the
control pins set the battery reversal, the line polarity is reversed with a proper transition time
set via an external capacitor (CREV).
Figure 5.
D0
0
0
1
1
Gain set
Input impedance synthesis: can be real or complex and is set by a scaled (x50 or
x25) external ZAC impedance
Transmit and receive: The AC signal present on the 2W port (TIP/RING) is transferred
to the Tx output with a -6dB or -12dB gain and from the Rx input to the 2W port with a
0dB or +6dB gain
2 to 4 wires conversion: The balance impedance can be real or complex, the proper
cancellation is obtained by means of two external impedances ZA and ZB
0
1
D1
Gain set in active mode
SLIC states in active mode
TIP/RING typical transition from direct to reverse polarity
1
1
1
1
Table 3
4 to 2 wires gain
Figure 5
D2
0
1
0
1
below).
+6dB
0dB
Table 4
GND
TIP
RING
Active normal polarity
Active reverse polarity
Active TTX injection (N.P.)
Active TTX injection (R.P.)
). The transition time is controlled by an external capacitor
).
dV/dT set
by CREV
4V typ.
2 to 4 wires gain
-12dB
-6dB
Operating mode
40V typ
ON-HOOK
Impedance synthesis scale factor
x 50
x 25
STLC3075