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參數(shù)資料
| 型號(hào)： | THS6032DWP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| 中文描述： | 低功耗寬帶局端線路驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 496K |
| 代理商： | THS6032DWP |
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THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
13
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 THS6032 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
distortion measurements are shown in Figures 11 – 15. It is commonly known that in the differential driver
configuration, the second order harmonics tend to cancel out. Thus, the dominant total harmonic distortion
(THD) will be primarily due to the third order harmonics. Additionally, distortion should be reduced as the
feedback resistance drops. This is because the bandwidth of the amplifier increases, which allows the amplifier
to react faster to any nonlinearities in the closed-loop system.
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.
One problem that has been receiving a lot of attention in the ADSL area is power dissipation. One way to
substantially reduce power dissipation is to lower the power supply voltages. This is because the RMS voltage
of an ADSL central office signal is 1.65-V RMS at each driver’s output with a 1:2 transformer. But, to meet ADSL
requirements, the drivers must have a voltage peak-to-RMS crest factor of 5.6 in order to keep the bit-error
probability rate below 10
–7
. Hence, the power supply voltages must be high enough to accomplish the driver’s
peak output voltage of 1.65 V
×
5.6 = 9.25 V
(PEAK)
.
This high peak output voltage requirement, coupled with a low RMS voltage requirement, does not lend itself
to conventional high efficiency designs. One way to save power is to decrease the bias currents internal to the
amplifier. The drawback of doing this is an increase in distortion and a lower frequency response bandwidth.
This is where the THS6032 class-G architecture is useful. The class-G output stage utilizes both a high supply
voltage [V
CC(H)
typically
±
15 V] and a low supply voltage [(V
CC(L)
typically
±
6 V]. As long as the output voltage
is less than [V
CC(L)
–2.5 V], then part of the output current will be drawn from the V
CC(L)
supplies. If the output
signal goes above this cutoff point [for example, V
O
>
V
CC(L)
– 2.5 V], then all of the output current will be supplied
by V
CC(H)
.
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| THS6032IGQE | LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| THS6032EVM | LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| THS6032GQEEVM | LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| THS6032CGQE | LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS6032EVM | 功能描述:放大器 IC 開發(fā)工具 THS6032 Hi-Spd Amp Eval Mods RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| THS6032GQE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| THS6032GQEEVM | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER |
| THS6032IDWP | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Low-Pwr ADSL Cent-Office Line Drv 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| THS6032IDWPG4 | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Low-Pwr ADSL Cent-Office Line Drv 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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