參數(shù)資料
型號： SI3050-E1-GT
廠商： Silicon Laboratories Inc
文件頁數(shù)： 55/128頁
文件大?。?/td> 0K
描述： IC VOICE DAA SYSTEM SIDE 24QFN
標準包裝： 74
系列： *
Si3050 + Si3011/18/19
32
Rev. 1.5
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 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 F
1100
900
+ 1 F
1101
900
+ 2.16 F
1110
600
+ 1 F
1111
Global complex impedance
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