Ericsson PBL38650-2QNS, PBL38650-2QNT, PBL38650-2SHT, PBL38650-2SOS, PBL38650-2SOT Datasheet

Description

The PBL 386 50/2 Subscriber Line Interface Circuit (SLIC) is a 90 V bipolar integrated circuit for use in Central Office Metering applications and other telecommunications equipment. The PBL 386 50/2 has been optimized for low total line interface cost and a high degree of flexibility in different applications.

The PBL 386 50/2 emulates resistive loop feed, programmable between 2x50 Ω and 2x900 Ω, with short loop current limiting adjustable to max 45 mA. In the current limited region the loop feed is nearly constant current with a slight slope corresponding to 2x30kΩ.

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 50/2 is compatible with both loop and ground 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 50/2 package options are 24-pin SSOP, 24-pin SOIC or 28-pin PLCC.

Figure 1. Block diagram.

June 1999

PBL 386 50/2

Subscriber Line

Interface Circuit

Key Features

• 24-pin SSOP package

• Programmable two-wire signal headroom for 2.2 V

rms

metering

• High and low battery with automatic switching

• Only +5 V feed in addition to battery

• Selectable transmit gain (0.5x or 0.25x)

• 70 mW on-hook power dissipation in active state

• On-hook transmission

• Long loop battery feed tracks Vbat for maximum line voltage

• No power-up sequence

• 43V open loop voltage @

-48V battery feed

• Constant loop voltage for line leakage <5 mA (RLeak ~ >10 kΩ @ -48V)

• Full longitudinal current capability during on-hook state

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

• Line voltage measurement

• Polarity reversal

• Ground key detector

• Tip open state with ring ground detector

24-pin SOIC, 24-pin SSOP, 28-pin PLCC

1

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 50/2

PBL 386 50/2

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

-65 -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 D

VB

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 50/2

3

Figure 2. Overhead voltage, V

TRO

, two-

wire port

1 << R

L

, RL= 600 Ω

ωC R

T

= 60 kΩ, RRX = 60 kΩ

Electrical Characteristics

0 °C ≤ T

Amb

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

Bat

= -58V to -40V, V

Bat2

= -32V, RLC=32.4 kΩ, I

L

= 27 mA. RL = 600 Ω, RF1= RF2= RP1= RP2=0, R

Ref

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

11 kΩ unless otherwise specified. Current definition: current is positive if flowing into a pin.

Ref

Parameter fig Conditions Min Typ Max Unit

Two-wire port

Overhead voltage, V

TRO ,ILdc

> 18mA 2 Active state, ROV = ∞ 2.7 V

Peak

0.2 kHz < f < 3.4 kHz

On-Hook, I

Ldc

< 5mA 1% THD, Note 1 1.1 V

Peak

Over load level, metering f≤16kHz, Z

LAC

=200Ω, Adj. by R

OV

5.0 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 18 mA

rms

/wire

Longitudinal to metallic balance, B

LM

Normal polarity:

(IEEE standard 455-1985, Z

TRX

=736Ω) 0.2 kHz < f < 1.0 kHz 55 dB

Longitudinal to metallic balance, B

LME

3 1.0 kHz < f < 3.4 kHz 55 dB

Reverse polarity:

0.2 kHz < f < 3.4 kHz 55 dB

Longitudinal to four-wire balance, B

LFE

3 Normal polarity:

0.2 kHz < f < 1.0 kHz 61 75 dB

1.0 kHz < f < 3.4 kHz 61 70 dB Reverse polarity:

0.2 kHz < f < 3.4 kHz 61 68 dB

Metallic to longitudinal balance, B

MLE

4 0.2 kHz < f < 3.4 kHz 40 50 dB

VTR

B

MLE

= 20 · Log ; ERX = 0

V

Lo

Figure 3. Longitudinal to metallic (B

LME

)

and Longitudinal to four-wire (B

LFE

)

balance

1 << 150 Ω, R

LR =RLT

=RL /2=300Ω

ωC RT = 60 kΩ, RRX = 60 kΩ

B

LFE

= 20 · Log

E

Lo

V

TR

B

LME

= 20 · Log

E

Lo

V

TX

PBL 386 50/2

TIPX

RINGX

RSN

VTX

R

T

R

RX

E

RX

R

L

V

TRO

I

LDC

C

PBL 386 50/2

TIPX

RINGX RSN

VTX

R

T

R

RX

V

TX

R

LT

C

V

TR

R

LR

E

Lo

PBL 386 50/2

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 27 35 dB

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

TIPX idle voltage, V

Ti

active, IL <5 mA - 1.3 V

RINGX idle voltage, V

Ri

active, IL <5 mA V

Bat

+3.0 V

tip open, I

L

<5 mA V

Bat

+3.0 V

V

TR

active, IL<5 mA V

Bat

+4.3 V

Four-wire transmit port (VTX) Overhead voltage, V

TXO

, IL > 18mA 5 Load impedance > 20 kΩ, 1.35 V

Peak

1% THD, Note 4

On-hook, I

L

< 5mA 0.55 V

Peak

Output offset voltage, ∆V

TX

-100 0 100 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

= -155 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, 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

= 60 kΩ, RRX = 60 kΩ

Figure 5. Overhead voltage, V

TXO

, four-

wire transmit port

1 << R

L

, RL = 600 Ω

ωC R

T

= 60 kΩ, RRX = 60 kΩ

Ref

PBL 386 50/2

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

LT

C

V

TR

R

LR

V

Lo

PBL 386 50/2

TIPX

RINGX RSN

VTX

R

T

R

RX

R

L

I

LDC

C

E

L

V

TXO

PBL 386 50/2

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 -6.22 -6.02 -5.82 dB

V

TR

PTG = AGND -12.24 -12.04 -11.84 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 +3 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, 1.0 kHz,

-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, 2 wire 12 dBrnC (TIPX-RINGX) or four-wire (VTX) output Psophometrical weighting, 2 wire -78 dBmp

C-message weighting, 4 wire 6 dBrnC Psophometrical weighting, 4 wire -84 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

Loop current, I

L

, in the current 13 18mA ≤ IL ≤ 45 mA 0.92 ILI

L

1.08 ILmA

limited region, reference A, B & C Tip open state TIPX current, I

Leak

7 S = closed; R = 7 kΩ, Note 10 -150 µA

Tip open state RINGX current, I

LRTo

R

LRTo

= 0Ω, V

Bat

= -48V I

L

mA

R

LRTo

= 2.5 kΩ, V

Bat

= -48V 17 mA

Tip open state RINGX voltage, V

RTo

I

LRTo

< 23 mA V

Bat

+6 V

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

= 60 kΩ, RRX = 60 kΩ

PBL 386 50/2

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

L

V

TR

I

LDC

C

E

L

V

TX