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PBL3766 Schematic ( PDF Datasheet ) - Ericsson Components

Teilenummer PBL3766
Beschreibung Subscriber Line Interface Circuit
Hersteller Ericsson Components
Logo Ericsson Components Logo 




Gesamt 18 Seiten
PBL3766 Datasheet, Funktion
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






PBL3766 Datasheet, Funktion
PBL 3766
Parameter
Digital inputs (C1, C2, E0)
Input low voltage, VIL
Input high voltage, VIH
Input low current, IIL
C1, C2
E0
Input high current, IIH
Digital output (DET)
Output low voltage, VOL
Output high voltage, VOH
Internal pull-up resistor
DET
short
circuit
current,
I
ODs
Power supply rejection ratio, PSRR
To two-wire or four-wire port, from
VCC, PSRRCC
V , PSRR
EE EE
VBat, PSRRBat
Ref.
Fig. Conditions
VIL = 0.4 V
VIH = 2.4 V
IOL = 2 mA, E0 = 0
IOH = -100 µA, E0 = 0
E0 = 1, DET shorted to ground
Note 12
50 Hz f 4 kHz
4 kHz f 50 kHz
50 Hz f 4 kHz
4 kHz f 50 kHz
50 Hz f 4 kHz
4 kHz f 50 kHz
Min
0
2.0
-200
-100
2.7
10
30
30
30
12
40
30
Power supply currents (relay driver off)
VCC current, ICC
V current, I
EE EE
V current, I
Bat Bat
VCC current, ICC
VEE current, IEE
VBat current, IBat
VCC current, ICC
VEE current, IEE
V current, I
Bat Bat
Power dissipation
Open circuit state total dissipation, POp
Stand-by state total dissipation, POnSb
Active state total dissipation, P
OnAct
Active state total dissipation,
POffAct200
POffAct600
Temperature guard
Junction temperature at threshold, T
JG
Temperature guard hysteresis, TJG
Thermal resistance
28-pin PLCC, θJP28plcc
22-pin plastic DIP, θJP22dip
Open circuit state
C2, C1 = 0, 0
On-hook
Stand-by state
C2, C1 = 1, 1
On-hook
Active state
C2, C1 = 1, 0
On-hook
C2, C1 = 0, 0
On-hook (RL = ) or off-hook (RL = 0)
C2, C1 = 1, 1
On-hook (RL = )
C2, C1 = 1, 0
On-hook (RL = )
C2, C1 = 1, 0, Note 13
Off-hook, RL = 200 ohm
Off-hook, RL = 600 ohm
145
Junction to terminals 3, 6, 10, 17, 24
connected together, Note 14
Junction to terminals 5, 6, 17, 18
connected together, Note 14
Typ
0.4
15
-330
35
35
35
18
50
35
1
1
0.5
2
1
0.5
4
2
3
25
35
160
1.35
1.05
160
20
10
10
Max
0.8
VCC
40
0.6
20
35
45
220
1.50
1.20
170
15
15
Unit
V
V
µA
µA
µA
V
V
kohm
µA
dB
dB
dB
dB
dB
dB
mA
mA
mA
mA
mA
mA
mA
mA
mA
mW
mW
mW
W
W
°C
°C
°C/W
°C/W
4-6

6 Page









PBL3766 pdf, datenblatt
PBL 3766
RFB
RRT
Tip
Ring
R1 CRT
-5V
RD
R2
RF -48V U3
K1 K1
AG
K2 K2
RF Note 6
VBAT
CTISP
CTC
CRC
CHP
HPT 20/15
RD 22/19
DT 23/20
TIPX 27/21
RINGX 28/22
GND 2/1
+5VVCC 4/2
U1
21/16 HPR
19/14 VTX
18/13 VEE
16/12 RSN
14/11 RDC
13/10 C1
12/9 C2
RTX
RT RB
RDC
RRX
+
CDC
U1
U2
-
+
CODEC/Filter
SLIC (Subscriber Line Interface
Circuit). PBL 3766
KR
To other line
interfaces
D2
Note 1
D1 PTC
Note 5
Ringing
RBat CBat
-48V
(-48V +90VRMS)
D3
-5V RSG
RINGRLY 5/3
VBAT Notes 2 & 3
RSG
7/4
11/8 DET
9/7 E0
N/C
Note 4
Digital
Interface
U2
U3
KR
D1, D2
D3
RF
Combination CODEC/filter, e.g.
TP3054 (or programmable
CODEC/filter, e.g. SLAC)
Secordary protection (e g Texas
Instruments TISP PBL1)
Ring relay, 2C contacts. Note 1
Diode, e.g. 1N4454
Diode, e.g. 1N4004
Line resistor, 40
1% match, e.g. Ericsson
Notes
Components
PBR 51XX
1. The relay coil may be connected to a negative voltage, down to the VBat limit. For VBat = -48 V
relay coils with voltage ratings from 5 V to 48 V may be used.
R1
R
2
Resistor, 150 k, 5%, 1/4 W
Resistor, 2 M, 5%, 1/4 W
2. The plastic leaded chip carrier terminals 3, 6, 10, 17 and 24 shall all be connected to the VBat
supply trace to provide heat sinking.
R
B
Resistor, 17.8 k, %, 1/4 W
R
Bat
Resistor, 5.1 , 5%, 1/4 W
RD Optional. Refer to paragraph
3.
The dual-in line package terminals 5, 6, 17 and 18 shall all be connected to the VBat supply trace
to provide heat sinking.
RDC
“Loop Current Detector”.
Resistor, 41.2 k, 5%, 1/4 W
4. The plastic leaded chip carrier terminals 8, 15 and 25 are not internally connected to the chip.
These terminals may be connected to ground to provide shielding.
5. It may be desirable to include a PTC or other type of short circuit protection for the ringing
generator.
RFB
RRX
RRT
RSG
RT
Resistor, 24.3 k, 1%, 1/4 W
Resistor, 261 k, 1%, 1/4 W
Resistor, 150 , 5%, 2 W
Resistor, 0 (for VBat = -48V)
Resistor, 523 k, 1%, 1/4 W
6. The ground terminals of the secondary protection should be connected to the ground terminal of RTX Resistor, 20.0 k, 1%, 1/4 W
the SLIC, and to the common ground on the Printed Board Assembly with a track as short and CBat Capacitor, 0.47 µF, 20%, 100 V
wide as possible, preferable a groundplane.
CDC Capacitor, 1.5 µF, 20%, 10 V
CHP Capacitor, 0.033 µF, 20%, 100V
CRT Capacitor, 0.39 µF, 20%, 100 V
CTC, CRC Capacitor, 2200 pF, 20%, 100 V
CTISP Capacitor, 220 nF, 20%, 100 V
Figure 11. Single channel subscriber line interface with PBL 3766 and a combination CODEC/filter.
Capacitors C and C
TC RC
The capacitors designated CTC and CRC in
figure 11, connected between TIPX and
ground as well as between RINGX and
ground, are recommended as an addition
to the overvoltage protection network.
Very fast transients, appearing on tip and
ring, may pass by the diode and SCR
clamps in the overvoltage protection
network, before these devices have had
time to activate and could damage the
SLIC.
CTC
and
C
RC
short
such
very
fast
transients to ground. The recommended
value for CTC and CRC is 2200 pF. Higher
capacitance values may be used, but
care must be taken to prevent
degradation of either longitudinal balance
or return loss. C and C contribute a
TC RC
metallic impedance of 1/(π·f·CTC)
1/(π·f·CRC), a TIPX to ground impedance
of 1/(2·π·f·CTC) and a RINGX to ground
impedance of 1/(2·π·f·CRC).
Ac - Dc Separation Capacitor, CHP
The high pass filter capacitor connected
between terminals HPT and HPR pro-
vides the separation between circuits
sensing tip-ring dc conditions and circuits
processing ac signals. A CHP value of
33 nF will position the low end frequency
response 3dB break point at 12 Hz (f3dB)
according
to
f
3dB
=
1/(2π·RHP·CHP)
where
RHP 400 k.
Battery Feed
Overview
The PBL 3766 SLIC synthesizes a cons-
tant current feed system. The block dia-
gram in figure 12 shows the PBL 3766
active state battery feed system. The
magnitude of the constant current is set
by a programming resistor, RDC.
To permit the line drive amplifiers to
operate without vf signal distortion even
on high resistance or open circuit loops,
a saturation guard circuit limits the loop
voltage, when the tip to ring dc voltage
approaches the available battery supply
voltage. The saturation guard function
allows the PBL 3766 to transmit and
receive vf signals with the telephone on-
hook.
Figure 13 shows an example of
PBL 3766 active state battery feed.
With the SLIC set to the stand-by state,
most of the circuit is disabled, including
the line drive amplifiers, to conserve power.
4-12

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