- 您现在的位置：买卖IC网 > PDF目录10910 > 73M2901CE-IM/F (Maxim Integrated Products)IC MODEM 3.3V V.22BIS 32-QFN PDF资料下载
参数资料
| 型号： | 73M2901CE-IM/F |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/27页 |
| 文件大小： | 0K |
| 描述： | IC MODEM 3.3V V.22BIS 32-QFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 490 |
| 数据格式： | V.21，V.22，V.23，Bell 103，Bell 212A |
| 波特率： | 300 ~ 9.6k |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
DS_2901CE_031
73M2901CE Data Sheet
Rev. 3.4
17
These commands are broken out as follows:
F
Set to factor defaults
S99=1
Set to U.S configuration (default)
Y0
Used clear channel mode (no speed buffering)
Y6
Use DTE/DCE speed buffering
K3
Use RTS/CTS flow control
C1
Use qualified carrier detection
C2
Use raw carrier detection
R2
Disconnect on
DTR toggle
S30=n
Set S30 to a modulation mode
Bn
Set to modulation mode
O2
Respond to retrain requests
S26+4
Enable auto retrain requests
S70=12
Lower retrain request threshold to 12
@L1
Leased line mode
Once the initialization string is given, the modems are started by sending ATD to one modem and ATA to
the other. The modems will then begin sending carriers and look for carrier from the other modem. When
the modems disconnect using R2 and
DTR, an “OK” result code is sent on RXD. The modem will stop
sending carrier at the end of the OK message, the delay time determined by the DTE speed and the time
it takes to output the message.
It is important to note the auto retrain feature (O2) should be enabled when using V.22bis. V.22bis
requires training when it connects and auto retrain is off by default. Make sure “S26+4” is also sent so it
can also initiate a retrain as well.
6.4.3
73M2901CE Energy Ring Detection
The 73M2901CE has a feature that was added with the intention of lowering the total modem cost by
eliminating some of the more expensive external components. The threshold for the ring detector
depends on the setting of the S123 register and the components in the Caller ID path, especially the
transformer. The number that S123 is set to represents the amplitude threshold of the ring signal (see
Table 2). In a conventional ring detect circuit the threshold is set by the hardware, usually the values of
the Zener diodes used in the ring detect circuit.
Table 3: Approximate Thresholds for Energy Ring Detection
Typical US Wet Transformer
S123 Register Setting with Frequency Checking
20
15
10
5
3
Vrms min off to on
45
34
24
12
7
Vrms min on to off
42
32
22
10
5
Typical ETSI TS 203 Dry Transformer Design
S123 Register Setting with Frequency Checking
20
15
10
5
3
Vrms min off to on
5
Vrms min on to off
5
Having the ability to set the threshold over a wide range through the S123 register eliminates the need to
change components to adjust the ring detection sensitivity. Energy ring detection uses the Caller ID path
and coupling transformer to path to pass the incoming ring signal to the modem so it can detect the ring
signal using the internal DSP. In an average design this can save at least $0.35 in the total parts cost or
even more in lower volume products. The 73M2901CE is still compatible with the earlier 2901 products
and still supports the opto-coupled ring detection method, although not on our current demo boards. Wet
transformers generally have poorer frequency response in the ring frequency range than dry
transformers. This means that the threshold must be sent to a lower number for wet transformers than
with some V.90-rated dry transformers. This also means that lower frequency ring signal detection will
also require a lower setting. The range of values for S123 can be from 1 to 127 when checking frequency
相关PDF资料 |
PDF描述 |
|---|---|
| MT5656RJ-L-34.R2 | MODEM RJ-11 V.34 SRL DATA 3.3V |
| MT5656RJ-L-34.R3 | MODEM RJ-11 V.34 SRL DATA 3.3V |
| VE-2NH-IX-F4 | CONVERTER MOD DC/DC 52V 75W |
| VE-2NH-IX-F3 | CONVERTER MOD DC/DC 52V 75W |
| MT5656RJ-L-32.R3 | MODEM RJ-11 V.32BIS DATA 3.3V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 73M2901CE-IMR/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem 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 |
| 73M2901CE-IMR/F1 | 功能描述:电信线路管理 IC 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 |
| 73M2901CL | 制造商:TDK 制造商全称:TDK Electronics 功能描述:V.22 BIS SINGLE CHIP MODEM |
| 73M2901CLIGT | 制造商:TDK 制造商全称:TDK Electronics 功能描述:V.22 BIS SINGLE CHIP MODEM |
| 73M2901CL-IGT/F | 功能描述:电信线路管理 IC V.22bis Single-Chip Modem w/Cid Ppu Liu 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 |
发布紧急采购，3分钟左右您将得到回复。