參數(shù)資料
型號： THS6062D
廠商： Texas Instruments, Inc.
英文描述： LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER
中文描述： 低噪聲寬帶雙差分接收機(jī)
文件頁數(shù)： 23/31頁
文件大?。?/td> 540K
代理商： THS6062D
THS6062
LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER
SLOS228B – JANUARY 1999 – REVISED JUNE 1999
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
optimizing frequency response (continued)
The next thing that helps to maintain a smooth frequency response is to keep the feedback resistor (R
f
) and
the gain resistor (R
g
) values fairly low. These two resistors are effectively in parallel when looking at the ac
small-signal response. This is why in Figure 29, a feedback resistor of 3.9 k
with a gain resistor of 1 k
only
shows a small peaking in the frequency response. The parallel resistance is only 800
. This value, in
conjunction with a very small stray capacitance test PCB, forms a zero on the edge of the amplifier’s natural
frequency response. To eliminate this peaking, all that needs to be done is to reduce the feedback and gain
resistances. One other way to compensate for this stray capacitance is to add a small capacitor in parallel with
the feedback resistor. This helps to neutralize the effects of the stray capacitance. To keep this zero out of the
operating range, the stray capacitance and resistor value’s time constant must be kept low. But, as can be seen
in Figures 23 – 28, a value too low starts to reduce the bandwidth of the amplifier. Table 1 shows some
recommended feedback resistors to be used with the THS6062.
Table 1. Recommended Feedback Resistors
GAIN
Rf for VCC =
±
15 V,
±
5 V, 5 V
300
360
3.3 k
(low stray-c PCB only)
2
–1
5
driving a capacitive load
Driving capacitive loads with high performance amplifiers is not a problem as long as certain precautions are
taken. The first is to realize that the THS6062 has been internally compensated to maximize its bandwidth and
slew rate performance. When the amplifier is compensated in this manner, capacitive loading directly on the
output will decrease the device’s phase margin leading to high frequency ringing or oscillations. Therefore, for
capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with the output of
the amplifier, as shown in Figure 44. A minimum value of 20
should work well for most applications. For
example, in 75-
transmission systems, setting the series resistor value to 75
both isolates any capacitance
loading and provides the proper line impedance matching at the source end.
+
_
THS6062
CLOAD
360
Input
Output
360
20
Figure 44. Driving a Capacitive Load
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS6062DGN 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER
THS6062EVM 功能描述:其他開發(fā)工具 THS6062 Eval Mod RoHS:否 制造商:Parallax 產(chǎn)品:ELEV-8 Hex Upgrade Kits 類型:Robotics 工具用于評估:ELEV-8 Quadcopter 工作電源電壓:
THS6062ID 功能描述:緩沖器和線路驅(qū)動器 High Speed 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
THS6062IDG4 功能描述:緩沖器和線路驅(qū)動器 High Speed 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
THS6062IDGN 功能描述:緩沖器和線路驅(qū)動器 High Speed 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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