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Ericsson

PBL38772-1 Datasheet Preview

PBL38772-1 Datasheet

Subscriber Line Interface Circuit

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Advance Information
PBL 387 72/1
Key Features
• On-chip high voltage ring generation
- Balanced, up to 80 VPeak
- Any ring waveform
- 5 REN ringing load
- Short circuit safe
- Automatic gain control of ringing signal
• Low on-hook power consumption in Active State
(65mW @ VBat=-80V)
• Automatic switching between ringing battery (VBat) and
talk battery (VTBat)
• Only +5V and Battery supplies needed
• Pulse metering and on-hook transmission
• UL-1950 and MTU compliant on-hook line voltage
• Programmable ring trip threshold
• 3.3V compatible logic interface
• Silent or fast polarity reversal
• 28-pin SOIC package
Applications
• Cable modems
• Voice over DSL (VoDSL)
• Terminal adapters
• ISDN Terminal adapters (NT1+)
• Voice over IP (VoIP)
• Routers
• Integrated Access Devices (IAD)
• Other short loop applications
Description
The PBL 387 72/1 Subscriber Line Interface Circuit
(SLIC) is a 90 V bipolar integrated circuit with on-chip
high voltage ring generation for use in short loop
applications. The PBL 387 72/1 SLIC has been
optimized for low power consumption, low total line
interface cost and for a high degree of flexibility meeting
worldwide requirements.
The PBL 387 72/1 SLIC supplies a balanced ringing
signal of any waveform (e.g. sinewave, trapezoidal, etc.)
VT BA T
VBAT
BGND
TIPX
HP
RINGX
VTB
Subscriber Line
Interface Circuit
Tw o -w ire
In terfa ce
Ring T rip
Detector
Li ne Feed
Co n trol ler
and
Longi tu d inal
S ignal
S uppr es sion
O ff-h o o k
Detector
V F S ignal
T rans m ission
R ingi ng
C ont rol
Input
Decoder and
C o n tro l
VCC
AGND
PRT
C1
C2
C3
DE T
PL C
LP
REF
SPR
PL D
VT X
RS N
CRING
VR
Figure 1. Block diagram
up to 80 VPeak (85 V dc supply) to the subscriber line across a
load of up to 5REN
The PBL 387 72/1 supplies programmable constant current
to the subscriber loop, sourced from the talk battery. The on-
hook line voltage of 43 V to 56 V is derived from the ring
battery. All battery switching is internal to the device and is
automatic.
To further reduce power consumption the automatic gain
control for the ring signal (AGCR) keeps the level always
adjusted to the maximum, that can be sourced from the
available dc ringing battery.
The SLIC incorporates loop current, ground key and ring trip
detection functions. The PBL 387 72/1 is compatible with loop
start signaling.
Two- to four-wire and four- to two-wire voice frequency (vf)
signal conversion is accomplished by the SLIC in conjunction
with any standard codec.
The line terminating impedance and balance impedance is
programmable (via hardware or software) and may be
complex or real for worldwide compliance.
Tip and ring voltages are UL-1950 compliant, i.e. no two-
wire line voltage exceeds 56 V.
The PBL 387 72/1 SLIC is available in a surface mount 28
SOIC package.
DataSheet4 U .com
PBL 387 72/1 shortform Rev. P5 Feb. 14, 2001
1 of 14
http://www.Datasheet4U.com/




Ericsson

PBL38772-1 Datasheet Preview

PBL38772-1 Datasheet

Subscriber Line Interface Circuit

No Preview Available !

www.DataSheet4U.com
Maximum Ratings
Parameter
Temperature, Humidity
Storage temperature range
Operating temperature range
Operating junction temperature range, Note 1
Power supply, -40°C TAmb +85°C
VCC with respect to AGND
Advance Information
Symbol
TStg
TAmb
TJ
VCC
Min
-55
-40
-40
-0.4
VTBat with respect to A/BGND
VBat with respect to BGND, continuous
Power dissipation
Continuous power dissipation at TAmb +85 °C
Ground
Voltage between AGND and BGND
Digital inputs, outputs (C1, C2, C3, DET)
Input voltage
Output voltage (DET not active)
Output current (DET)
TIPX and RINGX terminals, -40°C < TAmb < +85°C, VBat = -80 V
TIPX or RINGX current
TIPX or RINGX voltage, continuous (referenced to AGND)
TIPX or RINGX, pulse < 10 ms, tRep > 10 s, Note 2
TIPX or RINGX, pulse < 1 µs, tRep > 10 s, Note 2
TIP or RING, pulse < 250 ns, tRep > 10 s, Note 2
VTBat
V
Bat
PD
VBat
-85
VG -5
VID -0.4
VOD -0.4
IOD
ITIPX, IRINGX
VTA, VRA
VTA, VRA
VTA, VRA
VTA, VRA
-100
VBat
VBat -5
VBat -25
VBat -35
Max
+150
+110
+140
6.5
0.4
0.4
TBD
VCC
VCC
VCC
30
+100
2
5
10
15
Unit
°C
°C
°C
V
V
V
W
V
V
V
mA
mA
V
V
V
V
Recommended Operating Condition
Parameter
Ambient temperature
VCC with respect to AGND
V with respect to BGND
TBat
V with respect to BGND
Bat
Symbol
TAmb
VCC
V
TBat
VBat
Min
-40
4.75
VBat
-80
Max
+85
5.25
-10
-10
Unit
°C
V
V
V
Notes, Maximum Ratings
1. The circuit includes thermal protection. Operation above maximum junction temperature may degrade device
reliability.
2. With the diodes DB and D TB included, see figure 8.
DataSheet4 U .com
PBL 387 72/1 shortform Rev. P5 Feb. 14, 2001
2 of 14
http://www.Datasheet4U.com/


Part Number PBL38772-1
Description Subscriber Line Interface Circuit
Maker Ericsson
Total Page 14 Pages
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