APPENDIX A—DAA OPERATION Introduction " />
參數(shù)資料
型號(hào)： SI2400URT-EVB
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 76/94頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR SI2400 ISOMODEM
標(biāo)準(zhǔn)包裝： 1
系列： ISOmodem®
主要目的： 電信，調(diào)制解調(diào)器
嵌入式： 否
已用 IC / 零件： SI2400
主要屬性： 雙路 RJ-11 連接至電話線路，音頻連接器
次要屬性： RS-232，TTL 串行和 USB 接口
已供物品： 板，調(diào)制解調(diào)器，電源
相關(guān)產(chǎn)品： SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC
336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
其它名稱： 336-1166
Si2400
78
Rev. 1.3
APPENDIX A—DAA OPERATION
Introduction
This section describes the detailed functionality of the
integrated DAA included in the Si2400 chipset. This
specific functionality is generally transparent to the user
when using the on-chip controller in the Si2400 modem.
When bypassing the on-chip controller, the low-level
DAA functions of the Si3015 described in this section
can be controlled through S registers.
DAA Isolation Barrier
The Si2400 chipset consists of the Si3015 line-side
device and the Si2400 modem device. The Si2400
achieves an isolation barrier through a low-cost, high-
voltage
capacitor
in
conjunction
with
Silicon
Laboratories’ proprietary signal processing techniques.
These techniques eliminate any signal degradation due
to capacitor mismatches, common mode interference,
or noise coupling. As shown in Figure 3 on page 10, the
C1, C4, C24, and C25 capacitors isolate the Si2400
(DSP-side) from the Si3015 (line-side). All transmit,
receive, and control data are communicated through
this barrier.
Emissions/Immunity
The Si2400 chipset and recommended DAA schematic
is fully compliant with and passes all international
electromagnetic emissions and conducted immunity
tests (includes FCC part 15,68; EN50082-1). Careful
attention to the Si2400 bill of materials (page 11),
schematic (Figure 3 on page 10), and layout guidelines
(included in the Si2400URT-EVB data sheet) will ensure
compliance with these international standards. In
designs with difficult layout constraints, the addition of
the C22 and C30 capacitors to the C24 and C25
recommended
capacitors
may
improve
modem
performance on emissions and conducted immunity.
Also, under some layout conditions, C22 and C30 may
improve the immunity to telephone line transients. This
is most important for applications that use the voice
codec feature of the Si2400. Because line transients are
infrequent and high voltage in nature, they tend to be
more problematic in voice applications than in data
applications. An occasional pop in a voice application is
quite noticeable, whereas occasional bit errors are
easily corrected in a modem connection with an error-
correction protocol.
EN55022 and CISPR-22 Compliance
Compliance to the EN55022:1998 standard will be
necessary to conform to the European Union's EMC
Directive. Adherence to this standard will be necessary
to display the CE mark on designs intended for sale in
the EU. The deadline for EN55022 and CISPR-22
compliance is August 1, 2003. However, some non-
European countries currently require compliance to the
CISPR-22
specification.
The
typical
schematic
(Figure 3) and global bill of materials (BOM) (page 11)
contained in this data sheet is designed to be compliant
to the above mentioned standards. It should be noted
that L1, L2, R31, R32, C38, and C39 are only necessary
for those products which are intended for sale in the
European Union or require CISPR-22 compliance. If this
is not the target market then L1 and L2 can be replaced
with 0
Ω resistors and R31, R32, C38, and C39 need
not be populated.
While this population option achieves EN55022 and
CISPR-22
compliance,
there
are
several
system
dependent
and
country
dependent
issues
worth
considering. The first relates to the direct current
resistance (DCR) of the inductors. If the selected
inductors have a DCR of less than 3
Ω each, then
countries which require 300
Ω or less of dc resistance at
TIP and RING with 20 mA of loop current can be
satisfied with the Japan dc termination mode (SF5[3:2]
[DCT] = 01b). If the selected inductors have a DCR of
greater than 3
Ω but less than 8 Ω each, then low
voltage dc termination mode (DCT = 00) must be used
to satisfy the above requirement. In either case, Silicon
Laboratories
strongly
recommends
users
of
the
ISOmodem adhere to the section “DC Termination
Considerations” for dc termination requirements.
The second consideration relates to the power supply of
the target system. The recommended values for L1, L2,
R31, R32, C38, and C39 assume that the target system
provides a direct current connection between the target
system's reference ground (Si2400 GND) and an
external ground (often the third prong of a power plug).
If there is no direct connection between the reference
ground and external ground, then smaller inductor
values are possible. It should be understood that this
consideration is system dependent, and the impedance
between the system ground and the external ground in
the range of 500 kHz and 10 MHz should be well
known. Please contact a Silicon Laboratories technical
representative for further assistance in analyzing or
testing systems for this consideration.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI2401 制造商:SILABS 制造商全稱:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA
SI2401-C-FS 制造商:Silicon Laboratories Inc 功能描述:
SI2401DC-EVB 功能描述:子卡和OEM板 SI2401 Daughter Card RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
SI2401-FS 功能描述:電信線路管理 IC 2400b/s System Side 3rd Gen DAA Tech RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
Si2401FS08-EVB 功能描述:網(wǎng)絡(luò)開(kāi)發(fā)工具 Si2401+Si3008 ISO modem Eval Board RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評(píng)估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V
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