STLC3055N STMicroelectronics, STLC3055N Datasheet - Page 11

• Manufacturer Part Number: STLC3055N
• Manufacturer: STMicroelectronics

Specifications of STLC3055N

• Number Of Channels: 1
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: No
• Longitudinal Balanced: 58
• Operating Supply Voltage (typ): 9V
• Operating Temp Range: -40C to 85C
• Package Type: TQFP
• Loop Current Limit: 40mA
• Operating Temperature Classification: Industrial
• Pin Count: 44
• Mounting: Surface Mount
• Operating Current: 55mA
• Operating Supply Voltage (max): 12V
• Operating Supply Voltage (min): 5.5V
• Lead Free Status / RoHS Status: Not Compliant

STLC3055N
The STLC3055N feeds the line with a constant current fixed by RLIM (20 mA to 40 mA
range). The on-hook voltage is typically 40 V allowing on-hook transmission; the self
generated Vbat is -50 V typ.
If the loop resistance is very high and the line current cannot reach the programmed
constant current feed value, the STLC3055N behaves like a 40 V voltage source with a
series impedance equal to the protection resistors 2xRp (typ. 2 x 50 Ω).
typical DC characteristic in Active mode.
Figure 4.
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 5 mA to 9 mA.
Independently on the programmed constant current value, the TIP and RING buffers have a
current source capability limited to 80 mA typ. 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 Gain. Setting properly
by the gain set control bit (see
Table 7.
●
●
●
Once in Active mode (D1=1) the SLIC can operate in different states setting properly D0 and
D2 control bits (see also
Gain set
Input impedance synthesis: can be real or complex and is set by a scaled (x 50 or
x 25) external ZAC impedance.
Transmit and receive: The AC signal present on the 2W port (TIP and RING pins) is
transferred to the TX output with a -6 dB or -12 dB gain and from the RX input to the
2W port with a 0 dB or +6 dB gain.
2 to 4 wire conversion: The balance impedance can be real or complex, the proper
cancellation is obtained by means of two external impedance ZA and ZB
0
1
DC characteristic in active mode
Gain set in active mode
4 to 2 wire gain
+6 dB
Table
0 dB
40mA)
Table
(20 to
8).
Ilim
IL
7).
2 to 4 wire gain
-12 dB
-6 dB
SENSE
10V
2Rp
resistor.
Vbat (-50V)
VL
Impedance synthesis scale factor
Functional description
Figure 4
x 50
x 25
shows the
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