PBL38640-2 Ericsson, PBL38640-2 Datasheet - Page 9

• Manufacturer Part Number: PBL38640-2
• Description: Subscriber Line Interface Circuit
• Manufacturer: Ericsson

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SLIC Operating States
State
0
1
2
3
4
5
6
7
Table 1. SLIC operating states.
C3
0
0
0
0
1
1
1
1
C3
C2
C1
DET
NC
VCC
PLD
POV
PLC
REF
NC
RSN
AGND
VTX
}
C2
0
0
1
1
0
0
1
1
ground key detection.
connected from this pin to AGND.
off-hook and min 1.1 V in On-hook. If a resistor is connected between this pin and AGND: the overhead
voltage can be set to higher values.
from this pin to AGND.
AC-current flowing from RINGX to TIPX. Programming networks for two-wire impedance and receive
gain connect to the receive summing node. A resistor should be connected from this pin to AGND.
C1, C2 and C3 are digital inputs (internal pull-up) controlling the SLIC operating states.
Refer to section "Operating states" for details.
Detector output. Active low when indicating loop detection and ring trip, active high when indicating
No internal Connection
+5 V power supply.
Programmable Loop Detector threshold. The loop detection threshold is programmed by a resistor
Programmable Overhead Voltage. If pin is left open: The overhead voltage is internally set to min 2.7 V in
Prog. Line Current, the current limit, reference C in figure 13, is programmed by a resistor connected
A Reference, 49.9 k , resistor should be connected from this pin to AGND.
No internal Connection
Receive Summing Node. 200 times the AC-current flowing into this pin equals the metallic (transversal)
Analog Ground, should be tied together with BGND.
Transmit vf output. The AC voltage difference between TIPX and RINGX, the AC metallic voltage, is
reproduced as an unbalanced GND referenced signal at VTX with a gain of one (or one half, see pin
PTG). The two-wire impedance programming network connects between VTX and RSN.
C1
0
1
0
1
0
1
0
1
SLIC operating state
Open circuit
Ringing state
Active state
Active state
Tip open state
Active state
Active reverse
Active reverse
Active detector
-
Ring trip detector (active low)
Loop detector (active low)
Line voltage measurement (note 9)
Loop detector (active low)
Ground key detector (active high)
Loop detector (active low)
Ground key detector (active high)
PBL 386 40/2
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