ERICSSON PBL 386 14-1 User Manual

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Preliminary Information

Description

The PBL 386 14/1 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated
circuit for use in ISDN Network Terminal Adapters and other short loop
telecommunication equipment which often are remote powered, and by that, the
available power is limited. The PBL 386 14/1 has been optimized for low total line
interface cost, low power and requires a minimum of external components.
The PBL 386 14/1 has constant current feed, programmable to max 30mA. The SLIC
uses a first battery voltage for On-hook . A second battery voltage is used for
Off-hook and must be connected, 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 loop current controls the switching
between On-hook and Off-hook battery.
The SLIC incorporates loop current, ground key and ring trip detection functions.
The PBL 386 14/1 is compatible with loop start signalling. 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 line terminating
impedance could be complex or real to fit every market. Longitudinal voltages are
suppressed by a feedback loop in the SLIC and the longitudinal balance specifica­tions meet Bellcore TR909 requirements.
The PBL 386 14/1 package is a very PCB space efficient 28-pin SSOP.

DT

DR

TIPX

RINGX

HP

Two-wire
Interface

Ring Trip

Comparator

Ground Key

Detector

Line Feed
Controller

and

Longitudinal

Signal

Suppression

Ring Relay

Driver

Input

Decoder and

Control

RRLY

C1

C2

C3
VCC

DET

PSGTS
LP

REF

PLC

February 2000

PBL 386 14/1

Subscriber Line

Interface Circuit

Applications

• ISDN Network terminals

• Shortloop applications

Key Features

• Small footprint with SSOP package

• On-hook and Off-hook battery with
automatic switching, controlled by
loop current

• On-hook battery current is limited
to 6 mA

• 37 mW on-hook power dissipation in
active state

• Metering 0.5 Vrms (0.7 Vpeak)

• Adaptive Overhead Voltage
The overhead voltage follows
1Vpeak<signals<2.5Vpeak

• Battery supply as low as -10V

• Only +5V in addition to GND
and battery (VEE optional)

• Open loop voltage tracks On-hook
battery

• Full longitudinal current capability
during On-hook

• 43.5V open loop voltage @ -48V
battery feed

• Automatic compensation for
line leakage up to 5 mA

• On-hook transmission

• Programmable loop & ring-trip
detector threshold

• Ground key detector

• Analog temperature guard with status
exclusively viewed at detector output

• Integrated Ring Relay Driver

• Linevoltage measurement

VBAT2

VBAT

BGND

Figure 1. Block diagram.

Off-hook
Detector

VF Signal

Transmission

PLD
AGND

VTX

RSN

VEE
(optional)

PBL 386 14/1

Package: 28-pin SSOP

1

PBL 386 14/1

Maximum Ratings

Parameter Symbol Min Max Unit

Temperature, Humidity

Storage temperature range T
Operating temperature range T
Operating junction temperature range, Note 1 T

Power supply, 0°C ≤ T
V

with respect to AGND V

CC

V

with respect to AGND V

EE

V

with respect to A/BGND V

Bat2

V

with respect to BGND, continuous V

Bat

V

with respect to BGND, 10 ms V

Bat2

≤ +70°C

Amb

Stg

Amb

J

CC

EE

Bat2

Bat

Bat2

Power dissipation

Continuous power dissipation at T

≤ +70°CP

Amb

D

Ground

Voltage between AGND and BGND V

G

Relay Driver

Ring relay supply voltage BGND +13 V
Ring relay current 75 mA

-55 +150 °C

-40 +110 °C

-40 +140 °C

-0.4 6.5 V
V

Bat

V

Bat

0.4 V

0.4 V

-75 0.4 V

-80 0.4 V

0.8 W

-5 VCC V

Ring trip comparator

Input voltage V
Input current I

, V

DT

, I

DT

DR

V

DR

Bat

V

-5 5 mA

CC

V

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

Output voltage (DET not active) V
Output current (DET) I

TIPX and RINGX terminals, 0°C < T

< +70°C, V

Amb

= -50 V

Bat

TIPX or RINGX current I
TIPX or RINGX voltage, continuous (referenced to AGND), Note 2 V
TIPX or RINGX, pulse < 10 ms, t
TIPX or RINGX, pulse < 1 µs, t
TIP or RING, pulse < 250 ns, t

> 10 s, Note 2 VTA, V

Rep

> 10 s, Note 2 VTA, V

Rep

> 10 s, Note 3 VTA, V

Rep

ID

OD

OD

TIPX

TA

, I

, V

-0.4 V

-0.4 V

-110 +110 mA

RINGX

V

RA

RA

RA

RA

Bat

V

- 20 5 V

Bat

V

- 40 10 V

Bat

V

- 70 15 V

Bat

2V

CC

CC

V
V

30 mA

Recommended Operating Condition

Parameter Symbol Min Max Unit

Ambient temperature T
V

with respect to AGND V

CC

V

with respect to AGND V

EE

V

with respect to BGND V

Bat

V

with respect to BGND V

Bat2

Amb

CC

EE

Bat

Bat2

0 +70 °C

4.75 5.25 V
V

Bat

-4.75 V

-58 -10 V
V

Bat

-10 V

Notes

1. The circuit includes thermal protection. Operation above max. junction temperature may degrade device reliability.

2. A diode in series with the VBat input increases the permitted continuous voltage and pulse < 10 ms to -85 V.

A pulse ≤1µs is increased to the greater of |-70V| and |VBat -40V|.

3. R

2

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

F1

Electrical Characteristics

0 °C ≤ T
R

= 600 Ω, RLD = 50 kΩ, RF1, RF2 = 0 Ω, R

L

current is positive if flowing into a pin. Active state includes active normal unless otherwise specified.
Battery definition: V

≤ +70 °C, VCC = +5V ±5 %, VEE = -5V ± 5%, V

Amb

= On-hook battery, V

Bat

= 15kΩ, CHP = 68nF, CLP=0.47 µF, RT = 120 kΩ, RRX = 120 kΩ, Current definition:

Ref

= Off-hook battery.

Bat2

= -58V to -40V, V

Bat

= -22V, RLC=18.7kΩ (IL = 27 mA),

Bat2

PBL 386 14/1

Parameter fig Conditions Min Typ Max Unit

Ref

Two-wire port

Overload level, V
Off-Hook, I
On-Hook, I
Metering I
Input impedance, Z
Longitudinal impedance, Z
Longitudinal current limit, I

TRO

≥ 10 mA 1% THD, Note 1 1.0 V

LDC

≤ 5 mA 1.0 V

LDC

≥ 10 mA Z

LDC

TR

LoT

LoT

, Z
, I

LoR

LoR

Longitudinal to metallic balance, B

LM

2 Active state

= 200 Ω, f = 16 kHz 0.7 V

LTTX

Note 2 ZT/200
0 < f < 100 Hz 20 35 Ω/wire
active state 12 mA
IEEE standard 455-1985, ZTRX = 736 Ω

rms

Peak

Peak

Peak

/wire

0.2 kHz < f < 1.0 kHz 53 70 dB

1.0 kHz < f < 3.4 kHz 53 70 dB

Longitudinal to metallic balance, B
E

B

= 20 • Log 0.2 kHz ≤ f ≤ 1.0 kHz 53 70 dB

LME

V

Lo

TR

Longitudinal to four-wire balance, B
E

B

= 20 • Log 0.2 kHz ≤ f ≤ 1.0 kHz 59 70 dB

LFE

V

Lo

TX

Metallic to longitudinal balance, B

VTR

B

= 20 • Log ;ERX = 0 0.2 kHz < f < 3.4 kHz 40 58 dB

MLE

V

Lo

LME

LFE

MLE

3 active state

1.0 kHz < f < 3.4 kHz 53 70 dB

3 active state

1.0 kHz < f < 3.4 kHz 59 70 dB

4 active state

Figure 2. Overload level, V

, two-wire

TRO

port

1
<< R
wC

R

T

, RL= 600 Ω

L

= 120 kΩ, RRX = 120 kΩ

Figure 3. Longitudinal to metallic (B
and Longitudinal to four-wire (B

LFE

balance

1
<< 150 Ω, R
wC

= RLT = RL /2= 300Ω

LR

RT = 120 kΩ, RRX = 120 kΩ

C

R

)

LME

)

E

Lo

V

L

TRO

C

I

LDC

R

LT

R

LR

V

TR

TIPX

VTX

PBL 386 14/1

RINGX

TIPX

RSN

VTX

PBL 386 14/1

RINGX RSN

R

T

R

RX

R

T

R

RX

E

RX

V

TX

3

PBL 386 14/1

Parameter fig Conditions Min Typ Max Unit

Four-wire to longitudinal balance, B

FLE

Ref

4 active state

B

= 20 • Log

FLE

E

RX

V

Lo

0.2 kHz < f < 3.4 kHz 40 58 dB

Two-wire return loss, r |Z

r = 20 • Log

+ ZL|

TR

- ZL|

|Z

TR

0.2 kHz < f < 0.5 kHz 25 dB

0.5 kHz < f < 1.0 kHz 27 dB

1.0 kHz < f < 3.4 kHz, Note 3 23 dB
TIPX idle voltage, V
RINGX idle voltage, V
|V

| active, IL = 0 |V

TR

Ti

Ri

active normal, IL = 0 - 1.3 V
active normal, IL = 0 V

+5.5| |V

Bat

+3.1 V

Bat

+ 4.5| V

Bat

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

TXO

≥ 10mA Load impedance > 20 kΩ, 0.5 V

L

On-hook, IL ≤ 5mA 1% THD, Note 4 0.5 V
Output offset voltage, ∆V
Output impedance, z

TX

TX

5

Peak
Peak

-60 60 mV

0.2 kHz < f < 3.4 kHz 5 20 Ω
Four-wire receive port (RSN)

Receive summing node (RSN) dc voltage I

= 0 mA GND +25 mV

RSN

Receive summing node (RSN) impedance 0.2 kHz < f < 3.4 kHz 10 50 Ω
Receive summing node (RSN) 0.3 kHz < f < 3.4 kHz
current (I
gain,α

) to metallic loop current (IL) 400 ratio

RSN

RSN

Frequency response

Two-wire to four-wire, g

2-4

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

0.3 kHz < f < 3.4 kHz -0.15 0.15 dB

f = 8.0 kHz, 12 kHz, 16 kHz -0.5 0 0.1 dB

Figure 4. Metallic to longitudinal and

TIPX

R

C

V

Lo

LT

V

TR

PBL 386 14/1

R

LR

RINGX RSN

C

R

L

I

LDC

E

L

VTX

TIPX

VTX

PBL 386 14/1

RINGX RSN

R

T

R

RX

E

RX

R

T

R

RX

V

TXO

four-wire to longitudinal balance

1
<< 150 Ω, R
ωC

= RLR = RL /2 =300Ω

LT

RT = 120 kΩ, RRX = 120 kΩ

Figure 5. Overload level, V
transmit port

1
<< R
ωC

= 120 kΩ, RRX = 120 kΩ

R

T

, RL = 600 Ω

L

, four-wire

TXO

4

PBL 386 14/1

Parameter fig Conditions Min Typ Max Unit

Four-wire to two-wire, g

4-2

Ref

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

0.3 kHz < f < 3.4 kHz -0.15 0.15 dB

f = 8 kHz, 12 kHz, -1.0 -0.2 0 dB
16 kHz -1.0 -0.3 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 -0.15 0.15 dB

Insertion loss

Two-wire to four-wire, G

Four-wire to two-wire, G

2-4

4-2

6 0 dBm, 1.0 kHz, Note 5

V

G

= 20 • Log ,ERX = 0

2-4

TX

V

TR

6 0 dBm, 1.0 kHz, Notes 5, 6

V

G

= 20 • Log ,EG = 0

4-2

TR

E

RX

-6.22 -6.02 -5.82 dB

-0.2 0.2 dB

Gain tracking

Two-wire to four-wire R

≤ 2kΩ 6 Ref. -10 dBm, 1.0 kHz, Note 7

LDC

-40 dBm to +3 dBm -0.1 0.1 dB

-55 dBm to -40 dBm -0.2 0.2 dB
Four-wire to two-wire R

≤ 2kΩ 6 Ref. -10 dBm, 1.0 kHz, Note 7

LDC

-40 dBm to +3 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 7 12 dBrnC
(TIPX-RINGX) Psophometrical weighting -83 -78 dBmp

Note 8

Harmonic distortion

Two-wire to four-wire 6 0 dBm, 1.0 kHz test signal -50 dB
Four-wire to two-wire 0.3 kHz < f < 3.4 kHz -50 dB

Battery feed characteristics

Constant loop current, I

LConst

13 I

=

LProg

18 < I

500

R

LC

< 30 mA 0.95 I

LProg

LProg

I

LProg

1.05 I

LProg

mA

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

1
<< R
ωC

, RL = 600 Ω

L

RT = 120 kΩ, RRX = 120 kΩ

R

L

E

L

C

V

TR

I

LDC

TIPX

VTX

PBL 386 14/1

RINGX RSN

R

T

R

RX

E

RX

V

TX

5

PBL 386 14/1

Parameter fig Conditions Min Typ Max Unit

Ref

Loop current detector

Programmable threshold, I
I

> 10 mA R

LTh

DET

500 0.9•I

I

=

LTh

LD

LThILTh

1.1•I

LTh

mA

Ground key detector

Ground key detector threshold
I

LTIPX

and I

current difference to trigger ground key det. 11 15 19 mA

LRINGX

Ring trip comparator

Offset voltage, ∆V
Input bias current, I

DTDR

B

Input common mode range, V

, V

DT

DR

Source resistance, RS = 0 Ω -20 0 20 mV
IB = (IDT + IDR)/2 -50 -20 nA

V

+1 -1 V

Bat

Ring relay driver

Saturation voltage, V

OL

Off state leakage current, I

Lk

IOL = 50 mA 0.2 0.5 V
V

= 12 V 100 µA

OH

Digital inputs (C1, C2, C3)
Input low voltage, V
Input high voltage, V
Input low current, |I
Input high current, I

IL

IH

|V

IL

IH

= 0.5 200 µA

IL

VIH = 2.5 V 200 µA

0 0.5 V

2.5 V

CC

V

Detector output (DET)
Output low voltage, V

Internal pull-up resistor to V
Power dissipation (V

P

1

@ VEE=-5V Active State I

P

2

P

@ VEE=VB2 Active State ILo = 0 mA, IL = 0 mA 40 47 mW

3

P

@ VEE = -5V Active RL = 300Ω (off-hook) 415 mW

4

P

@ VEE = -5V Active RL = 600Ω (off-hook) 200 mW

5

Power supply currents (V
V

current, I

CC

V

current, I

EE

V

current, I

Bat

V

current, I

CC

V

current, I

EE

V

current, I

Bat

CC
EE
Bat
CC
EE
Bat

OL

CC

= -48V, V

Bat

Bat

= -48V)

= -22V, note 9)

Bat2

, On-hook Active State ILo= 0 mA, IL = 0 mA -0.8 -0.5 mA

IOL = 1 mA 0.1 0.6 V

10 kΩ

Open circuit state 15 18 mW

= 0 mA, IL = 0 mA 37 44 mW

Lo

Open circuit state 1.3 mA
Open circuit state -0.2 -0.1 mA
Open circuit state -0.2 -0.1 mA
Active State ILo= 0 mA, IL = 0 mA 2.1 3.5 mA
Active State ILo= 0 mA, IL = 0 mA 0.1 0.3 mA

Power supply rejection ratios

VCC to 2- or 4-wire port Active State, f = 1 kHz, Vn = 100mV 30 45 dB
V

to 2- or 4-wire port Active State, f = 1 kHz, Vn = 100mV 28.5 55 dB

EE

V

to 2- or 4-wire port Active State, f = 1 kHz, Vn = 100mV 45 60 dB

Bat

V

to 2- or 4-wire port Active State, f = 1 kHz, Vn = 100mV 28.5 60 dB

Bat2

Temperature guard

Junction threshold temperature, T

JG

140 °C

Thermal resistance
28-pin SSOP, θ

JP28SSOP

55 °C/W

6