Ericsson PBL38620-2QNS, PBL38620-2QNT, PBL38620-2SHT, PBL38620-2SOS, PBL38620-2SOT Datasheet

Description

The PBL 386 20/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in PBX,Terminal adapters and other telecommunications equipment.
The PBL 386 20/2 has been optimized for low total line interface cost and a high
degree of flexibility in different applications.

The PBL 386 20/2 has constant current feed, programmable to max. 30 mA.

A second lower battery voltage may be connected to the device to reduce short
loop power dissipation. The SLIC automatically switches between the two battery
supply voltages without need for external components or external control.

The SLIC incorporates loop current, ground key and ring trip detection functions.
The PBL 386 20/2 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 either a conventional CODEC/filter or
with a programmable CODEC/filter, e.g. SLAC, SiCoFi, Combo II. The programmable
two-wire impedance, complex or real, is set by a simple external network.

Longitudinal voltages are suppressed by a feedback loop in the SLIC and the
longitudinal balance specifications meet Bellcore TR909 requirements.

The PBL 386 20/2 package options are 24-pin SSOP, 24-pin SOIC and 28 pin PLCC.

Figure 1. Block diagram.

June 1999

PBL 386 20/2

Subscriber Line

Interface Circuit

Key Features

• 24-pin SSOP package

• High and low battery with automatic
switching

• 60 mW on-hook power dissipation in
active state

• On-hook transmission

• Long loop battery feed tracks Vbat for
maximum line voltage

• Only +5 V feed in addition to battery

• Selectable transmit gain (1x or 0.5x)

• No power-up sequence

• 44V open loop voltage @ -48V battery
feed

• Full longitudinal current capability
during on-hook state

• Analog over temperature protection
permits transmission while the
protection circuit is active

• Integrated Ring Relay driver

• Ground key detector

• Programmable signal headroom

24-pinSOIC, 24-pin SSOP, 28-pin PLCC

RRLY

C1

C2

C3

DET

PSG

REF

LP

PLD

PLC

VTX

RSN

PTG

BGND

AGND

VBAT

VBAT2

VCC

HP

RINGX

TIPX

DR

DT

Ring Relay

Driver

Input

Decoder

and

Control

Ring Trip

Comparator

Ground Key

Detector

Line Feed
Controller

and

Longitudinal

Signal

Suppression

Off-hook
Detector

VF Signal

Transmission

Two-wire
Interface

POV

PBL

386 20/2

PBL 386 20/2

1

PBL 386 20/2

PBL 386 20/2

2

Maximum Ratings

Parameter Symbol Min Max Unit

Temperature, Humidity

Storage temperature range T

Stg

-55 +150 °C

Operating temperature range T

Amb

-40 +110 °C

Operating junction temperature range, Note 1 T

J

-40 +140 °C

Power supply, 0°C ≤ T

Amb

≤ +70°C

V

CC

with respect to A/BGND V

CC

-0.4 6.5 V

V

Bat2

with respect to A/BGND V

Bat2

V

Bat

0.4 V

V

Bat

with respect to A/BGND, continuous V

Bat

-75 0.4 V

V

Bat

with respect to A/BGND, 10 ms V

Bat

-80 0.4 V

Power dissipation

Continuous power dissipation at T

Amb

≤ +70 °CP

D

1.5 W

Ground

Voltage between AGND and BGND V

G

-0.3 0.3 V

Relay Driver

Ring relay supply voltage BGND+14 V

Ring trip comparator

Input voltage V

DT

, V

DR

V

Bat

AGND V

Input current I

DT

, I

DR

-5 5 mA

Digital inputs, outputs (C1, C2, C3, DET)
Input voltage V

ID

-0.4 V

CC

V

Output voltage V

OD

-0.4 V

CC

V

TIPX and RINGX terminals, 0°C < T

Amb

< 70°C, V

Bat

= -50V

Maximum supplied TIPX or RINGX current I

TIPX

, I

RINGX

-100 +100 mA

TIPX or RINGX voltage, continuous (referenced to AGND), Note 2 VTA, V

RA

-80 2 V

TIPX or RINGX, pulse < 10 ms, t

Rep

> 10 s, Note 2 VTA, V

RA

V

Bat

-10 5 V

TIPX or RINGX, pulse < 1 µs, t

Rep

> 10 s, Note 2 VTA, V

RA

V

Bat

-25 10 V

TIPX or RINGX, pulse < 250 ns, t

Rep

> 10 s, Notes 2 & 3 VTA, V

RA

V

Bat

-35 15 V

Recommended Operating Condition

Parameter Symbol Min Max Unit

Ambient temperature T

Amb

0 +70 °C

V

CC

with respect to AGND V

CC

4.75 5.25 V

V

Bat

with respect to AGND V

Bat

-58 -8 V

AGND with respect to BGND V

G

-100 100 mV

Notes

1. The circuit includes thermal protection. Operation at or above 140°C junction temperature may degrade device reliability.

2. With the diodes DVB and D

VB2

included, see figure 12.

3. R

F1

and RF2 ≥ 20 Ω is also required. Pulse is applied to TIP and RING outside RF1 and RF2.

PBL 386 20/2

3

Figure 2. Overload level, V

TRO

, two-wire

port

1
<< R

L

, RL= 600 Ω

ωC
R

T

= 120 kΩ, RRX = 60 kΩ

Electrical Characteristics

0 °C ≤ T

Amb

≤ +70 °C, PTG = open (see pin description), VCC = +5V ±5 %, V

Bat

= -58V to -40V, V

BAT2

= -17V, RLC=38.3 kΩ, IL = 22 mA.

R

L

= 600 Ω, RF1= RF2=RP1= R

P2

=0 Ω, R

Ref

= 49.9 kΩ, CHP = 47 nF, CLP=0.15 µF, RT = 120 kΩ, RSG = 0 kΩ, RRX = 60 kΩ, RR = 52.3 kΩ,

R

OV

=∞ unless otherwise specified. Current definition: current is positive if flowing into a pin.

Ref

Parameter fig Conditions Min Typ Max Unit

Two-wire port

Overload level, V

TRO

2 Active state

1% THD, R

OV

= ∞ 1.0 V

Peak

On-Hook, I

Ldc

< 5mA Note 1 1.0 V

Peak

Input impedance, Z

TR

Note 2 ZT/200

Longitudinal impedance, Z

LOT

, Z

LOR

0 < f < 100 Hz 20 35 Ω/wire

Longitudinal current limit, I

LOT

, I

LOR

active state 10 mA

rms

/wire

Longitudinal to metallic balance, B

LM

IEEE standard 455-1984

0.2 kHz < f < 1.0 kHz 53 dB

1.0 kHz < f < 3.4 kHz 53 dB

Longitudinal to metallic balance, B

LME

3

0.2 kHz < f < 1.0 kHz 53 75 dB

B

LME

= 20 · Log

E

Lo

1.0 kHz < f < 3.4 kHz 53 70 dB

V

TR

Longitudinal to four-wire balance, B

LFE

3

0.2 kHz < f < 1.0 kHz 53 75 dB

B

LFE

= 20 · Log

E

Lo

1.0 kHz < f < 3.4 kHz 53 70 dB

V

TX

Metallic to longitudinal balance, B

MLE

4 0.2 kHz < f < 3.4 kHz 40 50 dB

VTR

B

MLE

= 20 · Log ; ERX = 0

VLo

PBL 386 20/2

TIPX

RINGX

RSN

VTX

R

T

R

RX

E

RX

R

L

V

TRO

I

LDC

C

PBL 386 20/2

TIPX

RINGX RSN

VTX

R

T

R

RX

V

TX

R

LT

C

V

TR

R

LR

E

Lo

Figure 3. Longitudinal to metallic (B

LME

)

and Longitudinal to four-wire (B

LFE

) bal-

ance

1
<< 150 Ω, R

LR =RLT

=RL /2=300Ω

ωC
R

T

= 120 kΩ, RRX = 60 kΩ

PBL 386 20/2

4

Parameter fig Conditions Min Typ Max Unit

Four-wire to longitudinal balance, B

FLE

4 0.2 kHz < f < 3.4 kHz 40 50 dB

E

RX

B

FLE

= 20 · Log

V

Lo

Two-wire return loss, r |ZTR + ZL|

r = 20 · Log

|Z

TR

- ZL|

0.2 kHz < f < 1.0 kHz 30 35 dB

1.0 kHz < f < 3.4 kHz, Note 3 20 22 dB

TIPX idle voltage, V

Ti

active, IL =0 mA - 1.1 V

RINGX idle voltage, V

Ri

active, IL =0 mA V

Bat

+2.5 V

V

TR

active, IL =0 mA V

Bat

+3.6 V

Four-wire transmit port (VTX)
Overload level, V

TXO

5 Load impedance > 20 kΩ, 1.0 V

Peak

1% THD, Note 4

On-hook, I

L

< 5mA 1.0 V

Peak

Output offset voltage, ∆V

TX

-100 100 mV

Output impedance, z

TX

0.2 kHz < f < 3.4 kHz 15 50 Ω

Four-wire receive port (RSN)
Receive summing node (RSN) DC voltage I

RSN

= -55 µA 1.15 1.25 1.35 V
Receive summing node (RSN) impedance 0.2 kHz < f < 3.4 kHz 8 20 Ω
Receive summing node (RSN) 0.3 kHz < f < 3.4 kHz
current (I

RSN

) to metallic loop current (IL) 200 ratio

gain,α

RSN

Frequency response

Two-wire to four-wire, g

2-4

6 relative to 0 dBm V

rms

, 1.0 kHz. ERX = 0 V

0.3 kHz < f < 3.4 kHz -0.20 0.10 dB
f = 8.0 kHz, 12 kHz, 16 kHz -1.0 0.1 dB

Figure 4. Metallic to longitudinal and four­wire to longitudinal balance

1
<< 150 Ω, R

LT

= RLR = RL /2 =300Ω

ωC
R

T

= 120 kΩ, RRX = 60 kΩ

Figure 5. Overload level, V

TXO

, four-wire

transmit port

1
<< R

L

, RL = 600 Ω

ωC
R

T

= 120 kΩ, RRX = 60 kΩ

Ref

PBL 386 20/2

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

LT

C

V

TR

R

LR

V

Lo

PBL 386 20/2

TIPX

RINGX RSN

VTX

R

T

R

RX

R

L

I

LDC

C

E

L

V

TXO

PBL 386 20/2

5

Four-wire to two-wire, g

4-2

6 relative to 0 dBm, 1.0 kHz. EL=0 V

0.3 kHz < f < 3.4 kHz -0.2 0.1 dB
f = 8 kHz, 12 kHz, -1.0 0 dB
16 kHz -2.0 0 dB

Four-wire to four-wire, g

4-4

6 relative to 0 dBm.1.0 kHz, EL=0 V

0.3 kHz < f < 3.4 kHz -0.2 0.1 dB

Insertion loss

Two-wire to four-wire, G

2-4

6 0 dBm, 1.0 kHz, Note 5
V

TX

G

2-4

= 20 · Log ; ERX = 0 -0.2 0.2 dB

V

TR

PTG = AGND -6.22 -6.02 -5.82 dB

Four-wire to two-wire, G

4-2

6 0 dBm, 1.0 kHz, Note 6
V

TR

G

4-2

= 20 · Log ; EL = 0 -0.2 0.2 dB

E

RX

Gain tracking

Two-wire to four-wire 6 Ref. -10 dBm, 1.0 kHz, Note 7

-40 dBm to + 0 dBm -0.1 0.1 dB

-55 dBm to -40 dBm -0.2 0.2 dB

Four-wire to two-wire 6 Ref. -10 dBm

-40 dBm to + 0 dBm -0.1 0.1 dB

-55 dBm to -40 dBm -0.2 0.2 dB

Noise

Idle channel noise at two-wire C-message weighting 12 dBrnC
(TIPX-RINGX) or four-wire (VTX) output Psophometrical weighting -78 dBmp

Note 8

Harmonic distortion

Two-wire to four-wire 6 0 dBm -67 -50 dB
Four-wire to two-wire 0.3 kHz < f < 3.4 kHz -67 -50 dB

Battery feed characteristics

Constant loop current, I

LProg

12 I

LProg

=

1 000

- 4.0 (mA) 0.92 I

LProgILProg

1.08 I

LProg

mA

R

LC

I

LProg

@ 30 mA 12 I

LProg

=

1 000

- 4.2 (mA) 0.95 I

LProgILProg

1.05 I

LProg

mA

R

LC

I

LProg

@ 18 mA 12 I

LProg

=

1 000

- 3.9 (mA) 0.94 I

LProgILProg

1.06 I

LProg

mA

R

LC

RLC in kΩ

Open circuit state loop current, I

LOC

RL = 0Ω -100 0 100 µA

Ref

Parameter fig Conditions Min Typ Max Unit

Figure 6.
Frequency response, insertion loss,
gain tracking.

1
<< R

L

, RL = 600 Ω

ωC
R

T

= 120 kΩ, RRX = 60 kΩ

PBL 386 20/2

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

L

V

TR

I

LDC

C

E

L

V

TX