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PDF PBL3766 Data sheet ( Hoja de datos )
| Número de pieza | PBL3766 | |
| Descripción | Subscriber Line Interface Circuit | |
| Fabricantes | Ericsson Components | |
| Logotipo |  |
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September 1997
PBL 3766, PBL 3766/6
Subscriber Line
Interface Circuit
Description
The PBL 3766 Subscriber Line Interface Circuit (SLIC) is a monolithic integrated
circuit, manufactured in 75 V bipolar technology. The PBL 3766 SLIC facilitates the
design of cost effective, high performance on-premises (ONS) analog line interface
cards for PABX systems and terminal adapters. Small package size and few
required external components result in a miniaturized design.
The PBL 3766 programmable, constant current loop feed system can operate with
battery supply voltages between -24 V and -58 V.
The SLIC incorporates loop current and ring trip detection functions as well as a
ring relay driver.
The two- to four-wire and four- to two-wire voice frequency (vf) signal conversion,
i.e. the hybrid function, is provided by the SLIC in conjunction with either a conven-
tional or a programmable CODEC/filter.
The PBL 3766 package is a 22 pin, plastic dual-in-line (batwing) or a 28-pin, plastic
j-leaded chip carrier (PLCC).
The differences between PBL 3766 and PBL 3766/6 are the specifications for
balance, output offset voltage, and insertion loss.
w DT 23/20
wwTIPX 27/21
HPT 20/15
.DHPR 21/16
aRINGX 28/22
taVCC 4/2
SVEE 18/13
Two-wire
Interface
hVBAT
eet4GND
3, 6, 10, 17, 24/
5, 6, 17, 18
2/1
Ring Trip
Detector
Line Feed
Controller
and
Longitudinal
Signal
Suppression
Loop Current
Detector
VF Signal
Transmission
Ring Relay
Driver
Input/Output
Decoder and
Control
U.comFigure 1. Block diagram. Pin numbers PLCC/DIP.
5/3 RINGRLY
13/10 C1
12/9 C2
9/7 E0
11/8 DET
14/11 RDC
7/4 RSG
22/19 RD
19/14 VTX
16/12 RSN
Key Features
• Low cost
• Few external components
• Programmable, constant current loop
feed
• Line feed characteristics independent
of battery supply variations
• -24 V to -58 V battery supply voltage
range
• Detectors
– programmable loop current detector
– ring trip detector
• Ring relay driver
• Hybrid function with conventional or
programmable CODEC/filters
• Line terminating impedance, complex
or real, set by a simple external
network or controlled by a
programmable CODEC/filter
• Idle noise typ. -83 dBmp, typ. 7 dBrnC
• Low on-hook power dissipation:
20 mW @ -28 V, 35 mW @ -48 V
• Tip-ring open circuit state for
subscriber loop power denial
• On-hook transmission
4-1
1 page  
PBL 3766
Parameter
Gain tracking
Two-wire to four-wire
Four-wire to two-wire
Noise
Idle channel noise at two-wire
(TIPX-RINGX) or four-wire (VTX) port
Ref
Fig. Conditions
6 Ref. -10 dBm, 1.0 kHz, Note 7
-40 dBm to +7 dBm
-55 dBm to -40 dBm
6 Ref. -10 dBm, 1.0 kHz, Note 8
-40 dBm to +7 dBm
-55 dBm to -40 dBm
Note 9
Psophometrical weighting
C-message weighting
Min
Typ
Max
Unit
-0.15
-0.15
±0.03
±0.03
±0.03
±0.03
+0.15
+0.15
dB
dB
dB
dB
-83 -78 dBmp
7 12 dBrnC
Harmonic distortion
Two-wire to four-wire
Four-wire to two-wire
Battery feed characteristics
Loop current in constant current region, IL
Stand-by state loop current, IL,
tolerance range
Loop current detector
On-hook to off-hook threshold, ILThOff
Off-hook to on-hook threshold, ILThOn
Detector threshold hysteresis, ∂ILTh
Loop current detector conversion factor
on-hook to off-hook, K
LThOff
Loop current detector conversion factor
off-hook to on-hook, KLThOn
Ring trip detector
Offset voltage, ∆VDTR
Input bias current, IDT
Input common mode range, V
DT
Ring relay driver
On-state voltage, VRRly
Off state leakage current, IRRly
Figure 6. Frequency response, insertion
loss, gain tracking.
1
ωC << RL, RL = 600 ohms,
RT = 600 kohms, RRX = 300 kohms
0.3 kHz ≤ f ≤ 3.4 kHz
0 dBm, 1.0 kHz test signal
-65
Active state, C2, C1 = 1, 0
2500
IL = RDC + 41700
RDC in ohms
Stand-by state, C2, C1 = 1, 1
V -3
IL = R
Bat
+ 1800
L
VBat tol. ±5%, TAmb = 25 °C
0.85 · IL IL
0.75·IL IL
RD = ∞, Note 10
RD = ∞, Note 10
1 1
ILThOff = KLThOff· RD + 62500
Note 11
ILThOn = KLThOn·
1
RD +
1
62500
Note 11
8.0
7.3
0.7
375 500
455
Source resistance, RS = 0
VBat < VDT < 0 V
-25
-300
V +1
Bat
-100
IRRly = 25 mA
VBat < VRRly < 0
C
RL
V TR
EL
I Ldc
-0.5
TIPX
27/21
VTX
19/14
PBL 3766
RINGX
28/22
RSN
16/12
-0.2
RT
RRX
-54 dB
1.15 · IL A
1.25·IL A
mA
mA
mA
660 V
V
25 mV
nA
-2 V
V
10 µA
E RX
V TX
4-5
5 Page 
PBL 3766
+
ZL
TIP
VTR
ZTR
+
EL
--
RING
TIPX 27/21
RF
HPT
RHP
2
20/15
CHP
21/16
HPR
RF
RHP
2
RINGX 28/22
+
1
-
+
1
-
IL
19/14 VTX
IL
ZT
+
VTX
-
Figure 8. Simplified ac transmission circuit.
PBL 3766
16/12 RSN
I L /1000
ZRX
+
VRX
-
VTX
19/14
RTX
PBL
3766
16/12
RSN
ZT
Z RX
ZB
RFB
-
+ VT
Combination
CODEC/Filter
VRX
Figure 9. Hybrid function.
TIPX 27/21
VLo I Lo
1
VLo I Lo
RINGX 28/22
1
I Lo
R VLo + VBat /2
+ RLo = 20 kohms
R
1
-
VLo
ILo /1000
VBat /2
I Lo
PBL 3766
Figure 10. Longitudinal feedback loop.
4-11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet PBL3766.PDF ] | |
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