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(yè)數(shù)： 20/31頁(yè)
文件大?。?/td> 496K
代理商： THS6032DWP
THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown control
There are two shutdown pins which control the shutdown for each amplifier of the THS6032. When the shutdown
pin signals are low, the THS6032 is active. But, when a shutdown pin is high (
≥
2 V), the corresponding amplifier
is turned off. The shutdown logic is not latched and should always have a signal applied to it. To help ensure
a fixed logic state, an internal 50 k
resistor to DGND is utilized. An external resistor, such as a 3.3 k
, to DGND
may be added to help improve noise immunity within harsh environments. If no external resistor is utilized and
SHDN
X
pins are left unconnected, the THS6032 will default to a power-on state. A simplified circuit can be seen
in Figure 43.
+VCC(H)
To Internal
Bias Circuitry
Control
–VCC(H)
DGND
DGND
50 k
SHDNX
Figure 43. Simplified THS6032 Shutdown Control Circuit
shutdown function
The THS6032 incorporates a shutdown circuit to conserve power. Traditionally when an amplifier is placed into
shutdown mode, the input and output circuitry are turned off. This conserves a large amount of power, but the
output impedance will be a very high, typically greater than several k
. This situation does not allow for proper
line termination resulting in a severe reduction of the receive signal coming through the transmission line (see
Figure 36).
The THS6032 eliminates this problem. When the SHDN
X
pin voltage is greater than 2 V, the THS6032 enters
shutdown mode to conserve power. Unlike the traditional amplifier, the THS6032’s output impedance is typically
0.5
at 1 MHz (see Figure 28). The shutdown mode function results in the proper termination of the line without
degradation in performance of the receive signal coming through the transmission line.
There are a few design considerations in order to fully achieve this type of functionality. To better understand
these design considerations, it is helpful to examine what is happening inside the THS6032. Figure 44 shows
the simplified shutdown components. Notice that there are two similar input stages; the normal input stage
consisting of transistors Q
1
through Q
4
and the shutdown input stage consisting of transistors Q
S1
through Q
S4
.
When in shutdown mode, the I
(BIAS–1)
and I
(BIAS–2)
current sources are turned off. This turns off the normal
input stage of the amplifier. The I
(BIAS–S1)
and I
(BIAS–S2)
current sources are then turned on. The shutdown
input stage signals are then fed through the same internal circuitry which the normal input stage drove. This
allows for sinking and sourcing large amounts of current at the output of the THS6032 during shutdown
operation. The Q
S1
through Q
S4
transistors are not designed for the performance like the Q
1
through Q
4
transistors because their only function is to amplify the DC ground reference, DGND. A 1-k
resistor connects
internally to the output node of the amplifier, which provides a feedback loop in shutdown mode. This forces the
output impedance to become very small, making for proper transmission line termination.
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參數(shù)描述
THS6032EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 THS6032 Hi-Spd Amp Eval Mods RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)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(chēng):Texas Instruments 功能描述:LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
THS6032GQEEVM 制造商:TI 制造商全稱(chēng):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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