Ericsson PBL38614-1SHT Datasheet

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.

Figure 1. Block diagram.

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

Package: 28-pin SSOP

1

Preliminary Information

VF Signal

Transmission

Off-hook Detector

Line Feed Controller

and

Longitudinal

Signal

Suppression

Ring Trip

Two-wire Interface

Input

Decoder and

Control

C1

C2

DET

REF

LP

VTX

RSN

DT

DR

TIPX

HP

RINGX

VCC

VBAT2

VBAT

AGND

C3

BGND

Comparator

Ground Key

Detector

Ring Relay

Driver

RRLY

PLD

PLC

PSGTS

VEE (optional)

PBL 386 14/1

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 AGND V

CC

-0.4 6.5 V

V

EE

with respect to AGND V

EE

V

Bat

0.4 V

V

Bat2

with respect to A/BGND V

Bat2

V

Bat

0.4 V

V

Bat

with respect to BGND, continuous V

Bat

-75 0.4 V

V

Bat2

with respect to BGND, 10 ms V

Bat2

-80 0.4 V

Power dissipation

Continuous power dissipation at T

Amb

≤ +70°CP

D

0.8 W

Ground

Voltage between AGND and BGND V

G

-5 VCC V

Relay Driver

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

Ring trip comparator

Input voltage V

DT

, V

DR

V

Bat

V

CC

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 (DET not active) V

OD

-0.4 V

CC

V

Output current (DET) I

OD

30 mA

TIPX and RINGX terminals, 0°C < T

Amb

< +70°C, V

Bat

= -50 V

TIPX or RINGX current I

TIPX

, I

RINGX

-110 +110 mA

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

TA

, V

RA

V

Bat

2V

TIPX or RINGX, pulse < 10 ms, t

Rep

> 10 s, Note 2 VTA, V

RA

V

Bat

- 20 5 V

TIPX or RINGX, pulse < 1 µs, t

Rep

> 10 s, Note 2 VTA, V

RA

V

Bat

- 40 10 V

TIP or RING, pulse < 250 ns, t

Rep

> 10 s, Note 3 VTA, V

RA

V

Bat

- 70 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

EE

with respect to AGND V

EE

V

Bat

-4.75 V

V

Bat

with respect to BGND V

Bat

-58 -10 V

V

Bat2

with respect to BGND V

Bat2

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

F1

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

PBL 386 14/1

3

Electrical Characteristics

0 °C ≤ T

Amb

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

Bat

= -58V to -40V, V

Bat2

= -22V, RLC=18.7kΩ (IL = 27 mA),

R

L

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

Ref

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

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

Bat

= On-hook battery, V

Bat2

= Off-hook battery.

Ref

Parameter fig Conditions Min Typ Max Unit

Two-wire port

Overload level, V

TRO

2 Active state

Off-Hook, I

LDC

≥ 10 mA 1% THD, Note 1 1.0 V

Peak

On-Hook, I

LDC

≤ 5 mA 1.0 V

Peak

Metering I

LDC

≥ 10 mA Z

LTTX

= 200 Ω, f = 16 kHz 0.7 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 12 mA

rms

/wire

Longitudinal to metallic balance, B

LM

IEEE standard 455-1985, ZTRX = 736 Ω

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

LME

3 active state

E

Lo

B

LME

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

V

TR

1.0 kHz < f < 3.4 kHz 53 70 dB

Longitudinal to four-wire balance, B

LFE

3 active state

E

Lo

B

LFE

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

V

TX

1.0 kHz < f < 3.4 kHz 59 70 dB

Metallic to longitudinal balance, B

MLE

4 active state

VTR

B

MLE

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

V

Lo

Figure 2. Overload level, V

TRO

, two-wire

port

1 << R

L

, RL= 600 Ω

wC

R

T

= 120 kΩ, RRX = 120 kΩ

Figure 3. Longitudinal to metallic (B

LME

)

and Longitudinal to four-wire (B

LFE

)

balance

1 << 150 Ω, R

LR

= RLT = RL /2= 300Ω

wC

RT = 120 kΩ, RRX = 120 kΩ

PBL 386 14/1

TIPX

RINGX

RSN

VTX

R

T

R

RX

E

RX

R

L

V

TRO

I

LDC

C

PBL 386 14/1

TIPX

RINGX RSN

VTX

R

T

R

RX

V

TX

R

LT

C

V

TR

R

LR

E

Lo

PBL 386 14/1

4

Parameter fig Conditions Min Typ Max Unit

Four-wire to longitudinal balance, B

FLE

4 active state

E

RX

B

FLE

= 20 • Log

V

Lo

0.2 kHz < f < 3.4 kHz 40 58 dB

Two-wire return loss, r |Z

TR

+ ZL|

r = 20 • Log

|Z

TR

- ZL|

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

Ti

active normal, IL = 0 - 1.3 V

RINGX idle voltage, V

Ri

active normal, IL = 0 V

Bat

+3.1 V

|V

TR

| active, IL = 0 |V

Bat

+5.5| |V

Bat

+ 4.5| V

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

TXO

5

Off-hook, I

L

≥ 10mA Load impedance > 20 kΩ, 0.5 V

Peak

On-hook, IL ≤ 5mA 1% THD, Note 4 0.5 V

Peak

Output offset voltage, ∆V

TX

-60 60 mV

Output impedance, z

TX

0.2 kHz < f < 3.4 kHz 5 20 Ω

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

RSN

= 0 mA GND +25 mV 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

RSN

) to metallic loop current (IL) 400 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 -0.15 0.15 dB f = 8.0 kHz, 12 kHz, 16 kHz -0.5 0 0.1 dB

Figure 4. Metallic to longitudinal and four-wire to longitudinal balance

1 << 150 Ω, R

LT

= RLR = RL /2 =300Ω

ωC RT = 120 kΩ, RRX = 120 kΩ

Figure 5. Overload level, V

TXO

, four-wire

transmit port

1 << R

L

, RL = 600 Ω

ωC R

T

= 120 kΩ, RRX = 120 kΩ

Ref

PBL 386 14/1

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

LT

C

V

TR

R

LR

V

Lo

PBL 386 14/1

TIPX

RINGX RSN

VTX

R

T

R

RX

R

L

I

LDC

C

E

L

V

TXO

PBL 386 14/1

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 -0.15 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

2-4

6 0 dBm, 1.0 kHz, Note 5

V

TX

G

2-4

= 20 • Log ,ERX = 0

V

TR

-6.22 -6.02 -5.82 dB

Four-wire to two-wire, G

4-2

6 0 dBm, 1.0 kHz, Notes 5, 6

V

TR

G

4-2

= 20 • Log ,EG = 0

E

RX

-0.2 0.2 dB

Gain tracking

Two-wire to four-wire R

LDC

≤ 2kΩ 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 R

LDC

≤ 2kΩ 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

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

=

500

R

LC

18 < I

LProg

< 30 mA 0.95 I

LProg

I

LProg

1.05 I

LProg

mA

Ref

Parameter fig Conditions Min Typ Max Unit

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

1 << R

L

, RL = 600 Ω

ωC RT = 120 kΩ, RRX = 120 kΩ

PBL 386 14/1

TIPX

RINGX RSN

VTX

R

T

R

RX

E

RX

R

L

V

TR

I

LDC

C

E

L

V

TX

PBL 386 14/1

6

Loop current detector

Programmable threshold, I

DET

I

LTh

=

500 0.9•I

LThILTh

1.1•I

LTh

mA

I

LTh

> 10 mA R

LD

Ground key detector

Ground key detector threshold I

LTIPX

and I

LRINGX

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

Ring trip comparator

Offset voltage, ∆V

DTDR

Source resistance, RS = 0 Ω -20 0 20 mV

Input bias current, I

B

IB = (IDT + IDR)/2 -50 -20 nA

Input common mode range, V

DT

, V

DR

V

Bat

+1 -1 V

Ring relay driver

Saturation voltage, V

OL

IOL = 50 mA 0.2 0.5 V

Off state leakage current, I

Lk

V

OH

= 12 V 100 µA

Digital inputs (C1, C2, C3) Input low voltage, V

IL

0 0.5 V

Input high voltage, V

IH

2.5 V

CC

V

Input low current, |I

IL

|V

IL

= 0.5 200 µA

Input high current, I

IH

VIH = 2.5 V 200 µA

Detector output (DET) Output low voltage, V

OL

IOL = 1 mA 0.1 0.6 V

Internal pull-up resistor to V

CC

10 kΩ

Power dissipation (V

Bat

= -48V, V

Bat2

= -22V, note 9)

P

1

Open circuit state 15 18 mW

P

2

@ VEE=-5V Active State I

Lo

= 0 mA, IL = 0 mA 37 44 mW

P

3

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

P

4

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

P

5

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

Power supply currents (V

Bat

= -48V)

V

CC

current, I

CC

Open circuit state 1.3 mA

V

EE

current, I

EE

Open circuit state -0.2 -0.1 mA

V

Bat

current, I

Bat

Open circuit state -0.2 -0.1 mA

V

CC

current, I

CC

Active State ILo= 0 mA, IL = 0 mA 2.1 3.5 mA

V

EE

current, I

EE

Active State ILo= 0 mA, IL = 0 mA 0.1 0.3 mA

V

Bat

current, I

Bat

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

Power supply rejection ratios

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

EE

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

V

Bat

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

V

Bat2

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

Temperature guard

Junction threshold temperature, T

JG

140 °C

Thermal resistance 28-pin SSOP, θ

JP28SSOP

55 °C/W

Parameter fig Conditions Min Typ Max Unit

Ref