PBL386612 Ver la hoja de datos (PDF) - Ericsson

Número de pieza

componentes Descripción

fabricante

PBL386612

Subscriber Line Interface Circuit

Ericsson  

PBL 386 61/2

A

Preliminary

DC characteristics

B

C

B

C

D

D

VTR [V]

A:

IL (@ VTR = 0) = ILConst

ILConst (typ) = ILProg =

500

R (14)

LC

B, C: IL = ILConst VTR = VBatVirt - RFeed • (ILProg - 5•10-3)

D:

RFeed =

RSG

400

+ 40

E: IL ≈ 5 mA

F:

Apparent battery VApp (@IL = 0) = VBatVirt + 5•10-3 • RFeed

G: RFeedG = 2 • 25 Ω

H:

VTRMax = |VBat| - VBOH

J:

Virtual battery VBatVirt (@ IL = 5 mA) = |VBat| - 6.8(17)

Figure 13. Battery feed characteristics (without the protection resistors on the line).

E

J

G

F

HF

Power-up Sequence

No special power-up sequence is neces-

sary except that ground has to be present

before all other power supply voltages.

The digital inputs C1 and C2 are internal

pull-up terminals.

Printed Circuit Board Layout

Care in Printed Circuit Board (PCB) layout

is essential for proper function;

The components connecting to the RSN

input should be placed in close proximity to

that pin, such that no interference is inject-

ed into the RSN pin. Ground plane sur-

rounding the RSN pin is advisable.

Analog ground (AGND) should be con-

nected to battery ground (BGND) on the

PCB in one point.

RLC and RREF should be connected to

AGND with short leads. Pin LP, pin PSG

and pin AOV are sensitive to leakage cur-

rents. Pin AOV should be surrounded by a

guardring connected to AGND.

RSG and CLP connections to VBAT should

be short and very close to each other.

CB and CB2 must be connected with short

wide leads.

16

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