e-stlc3095 STMicroelectronics, e-stlc3095 Datasheet - Page 13

• Manufacturer Part Number: e-stlc3095
• Description: Integrated Pots Interface For Home Gateway And Wll
• Manufacturer: STMicroelectronics

STLC3095
3.2.3
Table 7.
Gain set
0
1
Active
DC characteristics & supervision
When this mode is selected the STLC3095 provides both DC feeding and AC transmission.
The STLC3095 feeds the line with a constant current fixed by RLIM (20mA to 25mA range).
The on-hook voltage is typically 38V allowing on-hook transmission; the self generated Vbat
is -46V typ.
If the loop resistance is very high and the line current cannot reach the programmed
constant current feed value, the STLC3095 behaves like a 38V voltage source with a series
impedance equal to the protection resistors 2xRp (typ. 2x50Ω).
DC characteristic in ACTIVE mode.
The line status (on/off hook) is monitored by the SLIC’S supervision circuit. The off-hook
threshold can be programmed via the external resistor RTH in the range from 5mA to 9mA.
Independently on the programmed constant current value, the TIP and RING buffers have a
current source capability limited to 65mA typ.
Figure 4.
Moreover the power available at Vbat is controlled by the DC/DC converter that limits the
peak current drawn from the Vpos supply. The maximum allowed current peak is set by
R
AC characteristics
The SLIC provides the standard SLIC transmission functions:
Once in active mode the SLIC can operate with two different Tx, Rx gains respectively set by
the gain set control bit (see
Gain set in active mode
SENSE
resistor.
4 to 2 wire gain
DC characteristic in ACTIVE mode
+6dB
0dB
Table 7
25mA)
(20 to
Ilim
IL
2 to 4 wire gain
).
-12dB
-6dB
10V
2Rp
Impedance synthesis scale factor
Vbat (-46V)
VL
Figure 4
Functional description
x 50
x 25
shows the typical
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