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參數(shù)資料
| 型號： | Z0220122VSCR4078 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 44/48頁 |
| 文件大?。?/td> | 1331K |
| 代理商： | Z0220122VSCR4078 |
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Z02201
V.22bis Data Pump with Integrated AFE
ZiLOG
44
Z02201
PS000902-0501
EXAMPLE DAA
Figure 13 indicates an example DAA configuration for
North America. Isolation transformer, T1, couples the
primary (line) and secondary (modem) sides, while
providing high voltage isolation. This
wet
transformer
(allowing DC current) simplifies the circuit, while reducing
the cost of the DAA.
On the Secondary side, the transmit (TxA+ and TxA–) and
receive (RxA+ and RxA–) are combined in the 4-wire to 2-
wire hybrid circuit. This hybrid can be either passive or
active. The more complex active hybrid allows operation
to lower signal levels. It cancels out most of the transmit
signal from the receive signal.
On the Primary side, the off-hook relay switches the phone
line between a local handset (PHONE) or the modem. The
ring detect circuit consists of DC blocking capacitor C4,
current limiting resistor R2, zener diodes CR3 and CR4,
optocoupler U3, and its reverse protection diode D3.
Protection elements RV1, F1, C1, and C2 (and transformer
T1’s isolation) will provide higher voltage capability for
approval in some foreign markets. C1 and C2, for example,
may must be replaced by Metal Oxide Varistors (MOV’s)
or Gas Discharge Tubes (GDTs). The shunt relay reduces
the DAA impedance during pulse dialing. This operation
is required for some country regulations.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Z02205 | 制造商:ZILOG 制造商全稱:ZILOG 功能描述:MODEM EVALUATION KIT |
| Z0220516PSC1961 | 功能描述:電信線路管理 IC OTP CONTROLLER 86E34 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 |
| Z0220516PSCR3641 | 功能描述:電信線路管理 IC OTP CONTROLLER 86E34 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 |
| Z0220516PSCR4259 | 制造商:ZILOG 制造商全稱:ZILOG 功能描述:MODEM CONTROLLER IDEAL FOR LOW POWER CONSUMPTION, SMALL SIZE REQUIREMENTS |
| Z0220516PSCR4292 | 制造商:ZILOG 制造商全稱:ZILOG 功能描述:MODEM CONTROLLER IDEAL FOR LOW POWER CONSUMPTION, SMALL SIZE REQUIREMENTS |
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