PBL 387 73
18
19
20
21
22
23
24
25
26
27
PRT
PLD
VCC
C3
C2
C1
DET
VR
AGND
RSN
Detector
output. Active low when indicating loop or ring-trip detection, active high when indicating ground key detection.
Low
voltage ringsignal
input.
Analog Ground,
shall be tied together with BGND.
Receive Summing Node.
400 times the current flowing out of this pin equals the metallic (transversal) current
flowing from RINGX to TIPX. Programming networks for two-wire impedance and receive gain connect to the
receive summing node.
Transmit
vf output. The ac voltage difference between TIPX and RINGX, the ac metallic voltage, is reproduced at VTX with a
gain of 0.5. The two-wire impedance programming network connects between VTX and RSN.
Programmable Ring-trip
Resistor RRT connected between this pin and AGND. Sets the ring-trip threshold. The capacitor
C
RT
together with resistor R
RT
filters the ring-trip detector.
Programmable Loop Detector
threshold. The loop detection threshold is programmed by a resistor, R
LD
, connected
between this pin and AGND.
+5 V power supply.
C1, C2, C3 are digital inputs, which control the SLIC
operating states. Refer to table 1 for details.
28
VTX
Note:
A batwing is a package pin, which provides a low thermal resistance path to the silicon chip via the lead frame. By
soldering the batwing pins to PCB copper foil the device can be efficiently cooled. Note that batwing pins are at the same
voltage as the VBAT pin (substrate voltage).
SLIC Operating States
State
0
1
2
3
4
5
6
7
C3
0
0
0
0
1
1
1
1
C2
0
0
1
1
0
0
1
1
C1
0
1
0
1
0
1
0
1
SLIC Operating State
TIPX & RINGX open circuit
Ringing
Active
Active
Not applicable
Not applicable
Not applicable
Not applicable
Active detector (DET response)
No active detector (DET is set high)
Ring-trip detector (DET active low)
Loop current detector (DET active low)
Loop voltage measurement (DET pulse train)
–
–
–
–
Table 1. SLIC operating states.
EN/LZT 146 137 R1A © Ericsson Microelectronics, December 2001
9
ERICSSON [ ERICSSON ]
