PBL 386 15/1
Pin Description
Refer to figure 7.
SSOP
Symbol
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
RRLY
TS
HP
RINGX
BGND
TIPX
VBAT
VBAT2
NC
PSG
LP
DT
DR
NC
NC
VEE
REF
SPR
PLC
PLD
VCC
C3
C2
C1
DET
Ring Relay
driver output.
Tip Sense
should be connected to TIPX.
High Pass
connection for ac/dc separation capacitor C
HP
. Other end of C
HP
connects to RINGX (pin 26).
The TIPX and RINGX pins connect to the tip and ring leads of the two-wire interface via overvoltage
protection components and ring relay (and optional test relay).
Battery Ground,
should be tied together with AGND.
The TIPX and RINGX pins connect to the tip and ring leads of the two-wire interface via overvoltage
protection components and ring relay (and optional test relay).
On-hook
battery voltage. Negative with respect to BGND.
Off-hook
battery voltage, connected in series with a diode.
No Connect.
Must be left open.
Programmable Saturation Guard.
Must be connected to VBAT2.
Low Pass
saturation guard filter capacitor connected here to filter out noise and improve PSRR. Other end of
C
LP
connects to VBAT2.
Input to the ring trip comparator. With DR more positive than DT the detector output, DET, is at logic level
low, indicating off-hook condition. The ring trip network connects to this input.
Input to the ring trip comparator. With DR more positive than DT the detector output, DET, is at logic level
low, indicating off-hook condition. The ring trip network connects to this input.
No Connect.
Must be left open.
No Connect.
Must be left open.
-5V power supply, if not -5 V available connect to VB2 or VBAT (VB2 lower power dissipation than VBAT).
A 15kΩ resistor must be connected between this pin and AGND.
Silent Polarity Reversal.
The polarity reversal time can be adjusted with a capasitor connected to AGND.
Prog. Line Current,
the constant current part of the DC feed characteristic is programmed by a resistor
connected from this pin to AGND.
Programmable Loop Detector
threshold. The loop detection threshold is programmed by a resistor
connected from this pin to AGND.
+5 V power supply.
C1, C2 and C3 are digital inputs
Controlling
the SLIC operating states. Refer to section
Operating states for details.
Detector
output. Active low when indicating loop or ring trip detection, active high when indicating ground
key detection, active low when indicating temperature alarm.
Receive Summing Node.
400 times the current flowing into this pin equals the metallic (transversal) current
flowing from TIPX to RINGX. Programming networks for two-wire impedance and receive gain connect to the
receive summing node.
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 -0.5. The two-wire impedance
programming network connects between VTX and RSN.
}
RSN
27
28
AGND
VTX
8
ERICSSON [ ERICSSON ]
