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參數(shù)資料
| 型號： | THS6007CPWP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL DIFFERENTIAL LINE DRIVERS AND LOW-POWER RECEIVERS |
| 中文描述： | 雙差分線路驅(qū)動器和低功耗接收機 |
| 文件頁數(shù)： | 21/36頁 |
| 文件大小： | 679K |
| 代理商： | THS6007CPWP |
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THS6007
DUAL DIFFERENTIAL LINE DRIVERS AND LOW-POWER RECEIVERS
SLOS334– DECEMBER 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
ADSL (continued)
The ADSL transmit band consists of 255 separate carrier frequencies each with its own modulation and
amplitude level. With such an implementation, it is imperative that signals put onto the telephone line have as
low a distortion as possible. This is because any distortion either interferes directly with other ADSL carrier
frequencies or it creates intermodulation products that interfere with ADSL carrier frequencies.
The THS6007 has been specifically designed for ultralow distortion by careful circuit implementation and by
taking advantage of the superb characteristics of the complementary bipolar process. Driver single-ended
harmonic distortion measurements are shown in Figures 30 and 31. It is commonly known that in the differential
driver configuration, the second order harmonics tend to be reduced by 6 dB or more. Thus, the dominant total
harmonic distortion (THD) will be primarily due to the third order harmonics. For this test, the load was 25
and
the output signal produced a 2 V
O(PP)
signal. Thus, the test was run at full signal and full load conditions.
Another significant point is the fact that distortion decreases as the impedance load increases. This is because
the output resistance of the amplifier becomes less significant as compared to the output load resistance.
ADSL receive line noise
Per ANSI T1.413, the receive noise power spectral density for an ADSL line is –140 dBm/
√
Hz. This results in
a voltage noise requirement of less than 31.6 nV/
√
Hz for the receiver in an ADSL system with a 1:1 transformer
ratio.
Noise Power Spectral Density = –140 dBm/
√
Hz
Power = 1e–17
×
1 Hz = 0.01 fW
Assume: R
L
= 100
V
noise
=
√
(P
×
R) =
√
(0.01 fW
×
100
) = 31.6 nV/
√
Hz
For ADSL systems that use a 1:2 transformer ratio, such as central office line cards, the voltage noise
requirement for the receiver is lowered to 15.8 nV/
√
Hz.
TRANSFORMER
RATIO
Vnoise ON LINE
1:1
31.6 nV/
√
Hz
15.8 nV/
√
Hz
1:2
The THS6007 receiver was designed to operate with 10 nV/
√
Hz voltage noise, exceeding the noise
requirements for an ADSL system operating with 1:1 or 1:2 transformer ratios.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS6007IPWP | 功能描述:電信線路管理 IC Dual Diff Line Drvr & Lo-Pwr Receivers 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 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| THS6012 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL DIFFERENTIAL LINE DRIVERS AND RECEIVERS |
| THS60121 | 制造商:Texas Instruments 功能描述:THS60121 |
| THS6012CDWP | 功能描述:緩沖器和線路驅(qū)動器 500-mA Dual Diff Line Driver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| THS6012CDWP | 制造商:Texas Instruments 功能描述:DIFF LINE DRIVER SMD 6012 HSOP20 |
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