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Ericsson
Ericsson

PBL3796 Datasheet Preview

PBL3796 Datasheet

Subscriber Line Interface Circuit

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PBL3796 pdf
April 1997
www.DataSheet4U.com
PBL 3796, PBL 3796/2
Subscriber Line
Interface Circuit
Description
Key Features
PBL 3796 is an analog Subscriber Line Interface Circuits (SLICs), which are fabrica-
ted in a 75 V bipolar, monolithic process.
The programmable battery feed is resistive with short-loop current limiting. A
switch-mode regulator reduces on-chip power dissipation in the active state. In the
standby state, power dissipation is further reduced, while still permitting supervisory
functions to be active.
Tip-ring polarity is reversible without altering SLIC supervisory and voice frequency
(vf) functions. Tip and ring outputs can be set to high impedance states. These and
other operating states are activated via a parallel, four bit control word.
An external resistor controls the off-hook detector threshold current. The ring trip
detector can operate with both balanced and unbalanced ringing systems. The two
detectors are read via a shared output.
Ring and test relay drivers with internal clamp diodes are provided.
The complex or real two-wire impedance is set by a scaled, lumped element
network.
Two- to four-wire and four- to two-wire signal conversion is provided by the SLIC in
conjunction with either a conventional or a programmable CODEC/filter.
Longitudinal line voltages are suppressed by a control loop within the SLIC.
Packages are 28-pin, dual-in-line; 32-pin or 44-pin j-leaded chip carrier.
The difference between PBL 3796 and PBL 3796/2 is mainly the longitudinal
balance spec.
4
RINGRLY
5
TESTRLY
26
DR
25
DT
27
TIPX
22
HPT
23
HPR
28
RINGX
2
VREG
L
VBAT
GND2
6
7
1
Ring Relay
Driver
Test Relay
Driver
Ring Trip
Comparator
Two-wire
Interface
Input
Decoder
and
Control
Loop
Detector
VF Signal
Transmission
Line Feed
Controller and
Longitudinal
Suppression
Switching
Regulator
9 8 10
CHS VQBAT CHCLK
3
VCC
20
VEE
16
C1
14
C2
15
C3
11
C4
12
E0
13
DET
24
RD
21
VTX
19
RSN
17
RDC
18
GND1
• On-chip switch mode regulator to
minimize power dissipation
• Programmable, resistive battery feed
with short-loop current limiting
• Line feed characteristics independent
of battery variations
• Tip-ring polarity reversal function
• Tip and ring open circuit state; tip open
with ring active state
• Detectors:
- programmable loop current detector
- ring trip detector
• Ring and test relay drivers
• Line terminating impedance, complex
or real, set by a simple external
network
• Hybrid function with conventional or
programmable CODEC/filters
• 70 dB longitudinal to metallic balance
• 79 mA peak longitudinal current
suppression
• Idle noise < 10 dBrnC, < -80 dBup
PBL 3796
379P6BL
Figure 1. Block diagram. Pin numbers refer to the dual-in-line package.
4-105



Ericsson
Ericsson

PBL3796 Datasheet Preview

PBL3796 Datasheet

Subscriber Line Interface Circuit

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PBL3796 pdf
PBL 3796
Absolute Maximum Ratings
www.DataSheet4U.com
Note: pin numbers refer to the 28-pin, dual-in-line package, unless otherwise indicated.
Parameter
Temperature and humidity
Storage temperature range
Operating ambient temperature range
Operating junction temperature range (Note 1)
Symbol
T
Stg
TAmb
Tj
Min
-55
-40
-40
Power supply
VCC with respect to ground
VEE with respect to ground
VBat with respect to ground
Power dissipation
Continuous
power
dissipation
at
T
Amb
=
70
°C
(Note
3)
28-pin, plastic dual-in-line (N)
44-pin j-leaded chip carrier (QN)
32-pin, j-leaded and leadless chip carrier (RN)
Ground
Voltage between GND1 and GND2 (Note 4)
Switch mode regulator
Peak current through regulator switch (pin L)
Regulator switch output (pin L) peak off-state voltage
Relay drivers
Test relay supply voltage
Ring relay supply voltage
Test relay current
Ring relay current
Ring trip comparator
Input voltage
Input current, t = 10 ms
p
Digital inputs, outputs C1 - C4, E0, DET, CHCLK
Input voltage
Output voltage (DET not active)
Output current
TIPX and RINGX terminals
TIPX or RINGX continuous voltage (Notes 5, 6)
TIPX or RINGX, pulsed voltage, tw < 10 ms and trep > 10 s (Notes 5, 6)
TIPX or RINGX, pulsed voltage, tw < 1 µs and trep > 10 s (Notes 5, 6)
TIPX or RINGX, pulsed voltage, tw < 250 ns and trep > 10 s (Notes 5, 6, 7)
TIPX or RINGX current
Recommended Operating Conditions
Parameter
Ambient temperature
Case temperature
VCC with respect to ground
VEE with respect to ground
VBat with respect to ground (Note 8, 9, 11)
GND2 with respect to GND1 (Note 10)
4-106
VCC -0.4
VEE -6.5
VBat -70
VG12
-0.1
I
lPk
VlPk
V
TRly
VRRly
ITRly
IRRly
V
Bat
VBat
VDT, VDR
I ,I
DT DR
VBat
-2
VID -0.4
V -0.3
OD
IOD
VT, VR
VT, VR
VT, VR
VT, VR
ILdc
-70
-70
-90
-120
-105
Symbol
T
Amb
TCase
VCC
VEE
VBat
VG12
Min
0
0
4.75
-5.25
-58.0
0
Max
+150
+85
135
+6.5
+0.4
+0.4
1.5
1.5
1.7
+0.1
150
+2
V
CC
VCC
80
80
0
+2
VCC
V
CC
3
1
5
10
15
105
Max
70
90
5.25
-4.75
-40.0
0
Unit
°C
°C
°C
V
V
V
W
W
W
V
mA
V
V
V
mA
mA
V
mA
V
V
mA
V
V
V
V
mA
Unit
°C
°C
V
V
V
V


Part Number PBL3796
Description Subscriber Line Interface Circuit
Maker Ericsson
Total Page 22 Pages
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