SI3019-F-FM View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3019-F-FM

PROGRAMMABLE VOICE DAA SOLUTIONS

Silicon Laboratories 

Si3050 + Si3011/18/19

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

The Si3019 provides sixteen ac 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

register options to satisfy various global PTT

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

Register 30 is the ANSI/EIA/TIA 464 compromise

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 18. AC Termination Settings for the

Si3019 Line-Side Device

ACIM[3:0]

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

AC Termination

600 

900 

270  + (750  || 150 nF) and

275  + (780  || 150 nF)

220  + (820  || 120 nF) and 220 

+ (820  || 115 nF)

370  + (620  || 310 nF)

320  + (1050  || 230 nF)

370  + (820  || 110 nF)

275  + (780  || 115 nF)

120  + (820  || 110 nF)

350  + (1000  || 210 nF)

200  + (680  || 100 nF)

600  + 2.16 µF

900  + 1 µF

900  + 2.16 µF

600  + 1 µF

Global complex impedance

32

Rev. 1.5

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