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)： 22/31頁(yè)
文件大?。?/td> 496K
代理商： THS6032DWP
THS6032
LOW-POWER ADSL CENTRAL-OFFICE LINE DRIVER
SLOS233C – APRIL1999 – REVISED MARCH 2000
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown function (continued)
The second design consideration is due to transistors Q
5
and Q
6
. These transistors ensure the +IN to –IN
voltage separation is less than a V
BE
drop (about 0.7 V). This protects the other transistors, Q
1
to Q
4
, from
saturating during fast transients. Transistors Q
5
and Q
6
also enhance the slew rate capabilities of the THS6032.
When a fast transient is applied to the input, these transistors will quickly apply the currents to the active load
stages. A design issue with this setup is that while in shutdown mode, a large enough signal being applied to
the input pins may turn on these transistors. Once the input voltage differential between the +IN and –IN pins
reaches
±
0.7-V, transistors Q
5
and Q
6
turn on applying the difference signal to the rest of the amplifier circuitry.
Because these two transistors are designed for much higher performance levels than the shutdown circuitry
transistors (Q
S3
and Q
S4
), they will become dominant and the difference input signal will be utilized instead of
the DGND signal. Because the external negative feedback resistor path is still connected around the amplifier,
this difference input signal will be amplified just like a normal amplifier is designed to do (see Figure 46). As long
as the +IN and –IN input signals are kept below
±
0.7 V, the isolation from input-to-output is very high as shown
in the Shutdown Isolation vs Frequency graphs (see Figures 30 and 31).
To ensure proper shutdown functionality of the THS6032, it is important to keep the DGND voltage noise-free.
Additionally, the +IN and –IN signals should be limited to less than
±
0.7 V during shutdown mode. This will
ensure proper line termination functionality while conserving power.
Figure 46
0
1
2
3
4
5
6
7
0
2
4
6
8
10
SHUTDOWN FEEDTHROUGH
VIN – Input Voltage – V
VCC(H)=
±
15 V
VCC(L)=
±
5 V
RL = 25
VSD = 5 V
O
V
G = 5
G = 2
G = +1;
G = –1
slew rate
The slew rate performance of a current feedback amplifier, like the THS6032, is affected by many different
factors. Some of these factors are external to the device, such as amplifier configuration and PCB parasitics,
and others are internal to the device, such as available currents and node capacitance. Understanding some
of these factors should help the PCB designer arrive at a more optimum circuit with fewer problems.
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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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