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| 型号： | SI2400-FS |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 80/94页 |
| 文件大小： | 0K |
| 描述： | IC ISOMODEM SYST-SIDE DAA 16SOIC |
| 标准包装： | 48 |
| 系列： | ISOmodem® |
| 数据格式： | V.21，V.22，V.23，Bell 103，Bell 212A |
| 波特率： | 2.4k |
| 电源电压： | 3 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 管件 |
| 配用： | 336-1166-ND - BOARD EVAL FOR SI2400 ISOMODEM |
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Si2400
Rev. 1.3
81
state. It will take approximately one second to return to
normal dc operating conditions. The BTD and ROV bits
are sticky, and they must be written to zero to be reset.
After the BTE, ROV, and BTD bits are all cleared, the
BTE bit can be set to reenable billing tone detection.
Certain line events, such as an off-hook event on a
parallel phone or a polarity reversal, may trigger the
ROV or the BTD bits, after which the billing tone detector
must be reset. The user should look for multiple events
before qualifying whether billing tones are actually
present.
Although the DAA will remain off-hook during a billing
tone event, the received data from the line will be
corrupted (or a modem disconnect or retrain may occur)
in the presence of large billing tones. If the user wishes
to receive data through a billing tone, an external LC
filter must be added. A modem manufacturer can
provide this filter to users in the form of a dongle that
connects on the phone line before the DAA. This keeps
the manufacturer from having to include a costly LC filter
internal to the modem when it may only be necessary to
support a few countries/customers.
Alternatively, when a billing tone is detected, the host
software may notify the user that a billing tone has
occurred. This notification can be used to prompt the
user to contact the telephone company and have the
billing tones disabled or to purchase an external LC filter.
Billing Tone Filter (Optional)
In order to operate without degradation during billing
tones in Germany, Switzerland, and South Africa, an
external LC notch filter is required. (The Si3015 can
remain off-hook during a billing tone event, but modem
data will be lost [or a modem disconnect or retrain may
occur] in the presence of large billing tone signals.) The
notch filter design requires two notches, one at 12 KHz
and one at 16 KHz. Because these components are
fairly expensive and few countries supply billing tone
support, this filter is typically placed in an external
dongle or added as a population option for these
countries. Figure 18 shows an example billing tone filter.
Figure 19 shows the billing tone filter and the ringer
impedance network for the Czech Republic. Both of
these circuits may be combined into a single external
dongle.
L3 must carry the entire loop current. The series
resistance of the inductors is important to achieve a
narrow and deep notch. This design has more than
25 dB of attenuation at both 12 KHz and 16 KHz.
Figure 18. Billing Tone Filter
‘
Figure 19. Dongle Applications Circuit
Table 29. Component Values—Optional Billing
Tone Filters
Symbol
Value
C1,C2
0.027
μF, 50 V, ±10%
C3
0.01
μF, 250 V, ±10%
L3
3.3 mH, >120 mA, <10
Ω, ±10%
L4
10 mH, >40 mA, <10
Ω, ±10%
L4
C3
RIN G
TIP
FR O M
LINE
To
DAA
C1
C2
L3
TIP
RING
L3
3.3 mH, 120 mA
C1
0.027
F, 50 V
C2
0.027
F, 50 V
From
Line
To
Si3015
Chipset
L4
3.3 mH, 40 mA
C3
0.01
F, 250 V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI2400-FSR | 制造商:Silicon Laboratories Inc 功能描述:Modem Chip Chipset 2.4Kbps 16-Pin SOIC T/R |
| SI2400-KS | 功能描述:电信线路管理 IC 2400b/s System Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| SI2400-KSR | 功能描述:电信线路管理 IC 2400b/s System Side RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
| SI2400URT-EVB | 功能描述:开发板和工具包 - 无线 SI2400 RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:AT32UC3L 核心:AVR32 频率: 接口类型:USB 工作电源电压:5 V |
| SI2401 | 制造商:SILABS 制造商全称:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA |
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