Si3050 datasheet(32/128 Pages) SILABS

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Si3050 + Si3011/18/19

Rev. 1.5

The

Si3019

provides

sixteen

termination

impedances when used with the Si3050. The ACIM[3:0]

bits in Register 30 are used to select the ac impedance

setting on the Si3019. The sixteen available settings for

the Si3019 are listed in Table 18.

The most widely used ac terminations are available as

requirements. The real 600  impedance satisfies the

requirements of FCC Part 68, JATE, and other country

requirements. The 270  + (750  || 150 nF) satisfies

the requirements of TBR21.

There are two selections useful for satisfying

non-standard ac termination requirements. The

350  + (1000  || 210 nF) impedance selection in

impedance network for trunks. The last ac termination

selection, ACIM[3:0] = 1111, is designed to satisfy

minimum return loss requirements for every country that

requires a complex termination. By selecting this

setting, the system is ensured to meet minimum PTT

requirements.

For each of the sixteen ac termination settings, the

programmable digital hybrid can be used to further

reduce near-end echo. See "5.28. Transhybrid Balance"

on page 38 for details.

Table 17. AC Termination Settings for the

Si3018 Line-Side Device

ACIM[3:0]

AC Termination

0000

600 

0011

220  + (820  || 120 nF) and 220  +

(820  || 115 nF)

0100

370  + (620  || 310 nF)

1111

Global complex impedance

Table 18. AC Termination Settings for the

Si3019 Line-Side Device

ACIM[3:0]

AC Termination

0000

600 

0001

900 

0010

270  + (750  || 150 nF) and

275  + (780  || 150 nF)

0011

220  + (820  || 120 nF) and 220 

+ (820  || 115 nF)

0100

370  + (620  || 310 nF)

0101

320  + (1050  || 230 nF)

0110

370  + (820  || 110 nF)

0111

275  + (780  || 115 nF)

1000

120  + (820  || 110 nF)

1001

350  + (1000  || 210 nF)

1010

200  + (680  || 100 nF)

1011

600  + 2.16 µF

1100

900  + 1 µF

1101

900  + 2.16 µF

1110

600  + 1 µF

1111

Global complex impedance

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