PBL386402SHT datasheet(11/16 Pages) ERICSSON

Part #	PBL386402SHT

Description	Subscriber Line Interface Circuit

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Manufacturer	ERICSSON [Ericsson]

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PBL 386 40/2

11

Figure 10. Hybrid function.

When choosing R

TX, make sure the output

load of the VTX terminal is >20 k

Ω.

If calculation of the Z

B formula above

yields a balance network containing an

inductor, an alternate method is recom-

mended. Contact Ericsson Microelectron-

ics for assistance.

The PBL 386 40/2 SLIC may also be

used together with programmable

CODEC/filters. The programmable

CODEC/filter allows for system controller

adjustment of hybrid balance to accom-

modate different line impedances without

change of hardware. In addition, the

transmit and receive gain may be ad-

justed. Please, refer to the programm-

able CODEC/filter data sheets for design

information.

Longitudinal Impedance

A Feed back loop counteracts longitudi-

nal voltages at the two-wire port by

injecting longitudinal currents in opposing

phase.

Thus longitudinal disturbances will

appear as longitudinal currents and the

TIPX and RINGX terminals will experi-

ence very small longitudinal voltage

excursions, leaving metallic voltages well

within the SLIC common mode range.

The SLIC longitudinal impedance per

wire, Z

LoT and ZLoR, appears as typically

20

Ω to longitudinal disturbances. It

should be noted that longitudinal currents

may exceed the dc loop current without

disturbing the vf transmission.

Capacitors C

TC and CRC

The capacitors designated C

TC and CRC

in figure 12, connected between TIPX

and ground as well as between RINGX

and ground, can be used for RFI filter-

ing.. The recommended value for C

TC

and C

RC is 2200 pF. Higher capacitance

values may be used, but care must be

taken to prevent degradation of either

longitudinal balance or return loss. C

TC

and C

RC contribute to a metallic imped-

ance of 1/(

π·f·C

TC) = 1/(π·f·CRC), a TIPX to

ground impedance of 1/(2·

π·f·C

TC) and a

RINGX to ground impedance of 1/

(2·

π·f·C

RC).

AC - DC Separation Capacitor, C

HP

The high pass filter capacitor connected

between terminals HP and TIPX provides

the separation of the ac signal from the

dc part. C

HP positions the low end

VT

Combination

CODEC/Filter

RTX

RFB

ZB

ZRX

ZT

VTX

RSN

VRX

PBL

386 40/2

frequency response break point of the ac

loop in the SLIC. Refer to table 1 for

recommended values of C

HP.

Example: A C

HP value of 150 nF will

position the low end frequency response

3dB break point of the ac loop at 1.8 Hz

(f

3dB) according to f3dB = 1/(2·π·RHP·CHP)

where R

HP = 600 kΩ.

High-Pass Transmit Filter

The capacitor C

TX in figure 12 connected

between the VTX output and the

CODEC/filter forms, together with R

TX

and/or the input impedance of a pro-

grammable CODEC/filter, a high-pass

RC filter. It is recommended to position

the 3 dB break point of this filter between

30 and 80 Hz to get a faster response for

the dc steps that may occur at DTMF

signalling.

Capacitor C

LP

The capacitor C

LP, which connects between

the terminals CLP and VBAT, positions

together with the resistive loop feed resis-

tor R

SG (see section Battery Feed), the high

end frequency break point of the low pass

filter in the dc loop in the SLIC. C

LP together

with R

SG, CHP and ZT (see section Two-Wire

Impedance) forms the total two wire output

impedance of the SLIC. The choise of

these programmable components have an

influence on the power supply rejection

ratio (PSRR) from VBAT to the two wire

side at sub-audio frequencies. At these

frequencies capacitor C

LP also influences

the transversal to longitudinal balance in

the SLIC. Table 1 suggests suitable values

on C

LP for different Feeding characteristics.

Typical values of the transversal to longitu-

dinal balance (T-L bal.) at 200Hz is given in

table 1 for the chosen values on C

LP.

R

Feed

R

SG

C

LP

T-L bal. C

HP

@200Hz

[

Ω][kΩ]

[nF]

[dB]

[nF]

2

⋅50

0

150

-46

47

2

⋅200

60.4

100

-46

150

2

⋅400

147

47

-43

150

2

⋅800

301

22

-36

150

Table 1. R

SG , CLP and CHP values for

different Feeding characteristics.

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