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參數(shù)資料
型號： SI2400-FS
廠商： Silicon Laboratories Inc
文件頁數(shù)： 77/94頁
文件大小： 0K
描述： IC ISOMODEM SYST-SIDE DAA 16SOIC
標準包裝： 48
系列： ISOmodem®
數(shù)據(jù)格式： V.21，V.22，V.23，Bell 103，Bell 212A
波特率： 2.4k
電源電壓： 3 V ~ 5.25 V
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 16-SOIC N
包裝： 管件
配用： 336-1166-ND - BOARD EVAL FOR SI2400 ISOMODEM
Si2400
Rev. 1.3
79
DC Termination
The Si2400 has four programmable dc termination
modes which are selected with SF5[3:2] (DCT).
FCC mode (DCT = 10b), shown in Figure 14, is the
default dc termination mode and supports a transmit full
scale level of –1 dBm at TIP and RING. This mode
meets FCC requirements in addition to the requirements
of many other countries.
Figure 14. FCC Mode I/V Characteristics
CTR21 mode DCT = 11b, shown in Figure 15, provides
current limiting while maintaining a transmit full scale
level of –1 dBm at TIP and RING. In this mode, the dc
termination will current limit before reaching 60 mA.
Figure 15. CTR21 Mode I/V Characteristics
Japan mode DCT = 01b, shown in Figure 16, is a lower
voltage mode and supports a transmit full scale level of
–2.71 dBm. Higher transmit levels for DTMF dialing are
also supported. See "DTMF Dialing" on page 80. The
low voltage requirement is dictated by countries such as
Japan and Malaysia.
Figure 16. Japan Mode I/V Characteristics
Low Voltage mode (DCT = 00b), shown in Figure 17, is
the lowest line voltage mode supported on the Si2400,
with a transmit full scale level of –5 dBm. Higher
transmit levels for DTMF dialing are also supported.
See “DTMF Dialing”. This low voltage mode is offered
for situations that require very low line voltage
operation. It is important to note that this mode should
only be used when necessary, as the dynamic range will
be significantly reduced and thus the ISOmodem will
not be able to transmit or receive large signals without
clipping them.
Figure 17. Low Voltage Mode I/V
Characteristics
12
11
10
9
8
7
6
.01 .02 .03 .04 .05 .06 .07 .08 .09
.1
.1 1
Loop Current (A )
FCC DCT M ode
V
ol
tag
e
A
c
ro
s
D
A
(
V
)
45
40
35
30
25
20
15
10
5
.015 .02 .025 .03 .035 .04 .045 .05 .055 .06
Loop Current (A )
CTR21 DCT M ode
V
ol
tag
e
A
c
ro
s
D
A
(
V
)
10.5
10
9.5
9
8.5
8
7.5
7
6.5
6
5.5
.01 .02 .0 3 .04 .0 5 .06 .07 .08 .09
.1
.1 1
Loop Current (A )
Japan DCT M ode
Vo
lt
a
g
e
Acr
o
ss
D
A
(
V
)
10.5
10
9.5
9
8.5
8
7.5
7
6.5
6
5.5
.01 .02 .0 3 .04 .0 5 .06 .07 .08 .09
.1
.1 1
Loop Current (A )
Low V oltage M ode
Vo
lt
a
g
e
Acr
o
ss
D
A
(
V
)
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