PBL38611-2 查看數據表（PDF） - Ericsson
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PBL38611-2 Datasheet PDF : 18 Pages
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PBL 386 11/2
Pin Description
Refer to figure 7.
PLCC Symbol
1 VBAT
2 VBAT2
3 AOV
4 PSG
5 LP
6 DT
7 DR
8 VEE
9 REF
10 SPR
11 PLC
12 PLD
13 VCC
} 14 C3
15 C2
16 C1
17 NC
18 DET
19 RSN
20 AGND
21 VTX
22 RRLY
23 TS
24 NC
25 HP
26 RINGX
27 BGND
28 TIPX
Description
Battery supply voltage. Negative with respect to BGND.
An optional second battery voltage, connected in series with a diode, or an external powerhandling resistor
connects to this pin.
Adaptive Overhead Voltage. If pin is left open then the overhead voltage is set internally to 2.5 VPeak in off-
hook and 1.4 VPeak in on-hook. The overhead voltage will adapt to signals > 2.5 VPeak. If pin is connected to
AGND then no internal overhead voltage is set. The overhead voltage adapts to 0.6 VPeak < signals < 5 VPeak.
Programmable Saturation Guard. The resistive part of the DC feed characteristic is programmed by a
resistor connected from this pin to VBAT.
Low Pass saturation guard filter capacitor connected here to filter out noise and improve PSRR. Other end of
CLP connects to VBAT.
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.
-5V to VBAT power supply.
A 15kΩ resistor should 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.
No Connect. Must be left open.
Detector output. Active low when indicating loop or ring trip detection, active high when indicating ground
key detection
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.
Ring Relay driver output.
Tip Sense should be connected to TIPX.
No Connect. Must be left open.
High Pass connection for ac/dc separation capacitor CHP. Other end of CHP 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).
8
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