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參數(shù)資料
| 型號： | THS3092DR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS |
| 中文描述： | 高壓，低失真，電流反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 18/34頁 |
| 文件大小： | 1605K |
| 代理商： | THS3092DR |
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www.ti.com
+
THS3092
20 V
+
1:1
THS3092
330 pF
330 pF
22 pF
22 pF
10 V
10 V
0
200
100
14.5 dBm
200
604
4.99 k
4.99 k
0.01 F
191
604
1.21 k
0
24.9
6.8 F
0.01 F
24.9
*Hybrid Connection Not
Shown For Simplicity
DAC
V
IN+
DAC
V
IN
1.21 k
Video Distribution
+
THS3092
26 V
+
1:1
THS3092
To RX
Hybrid
330 pF
330 pF
22 pF
13 V
13 V
0.01 F
6.8 F
4.99 k
200
DAC
V
IN+
22 pF
133
604
604
0.015 F
200
4.99 k
49.9
49.9
0
0
14.5 dBm
100
DAC
V
IN
THS3092
THS3096
SLOS428A–DECEMBER 2003–REVISED FEBRUARY 2004
Figure 55 shows a traditional hybrid connection
approach for achieving the 14.5-dBm line power
utilizing a 1:1 transformer. Looking at the input to the
amplifiers shows a low-pass filter consisting of two
separate capacitors to ground. There is an argument
that since the signal coming out of the DAC is
fully-differential then a single capacitor (10 pF in this
case) is perfectly acceptable. The problem with this
idea is that many DACs have common-mode energy
due to images around the sampling frequency which
must be filtered before reaching the amplifier. An
amplifier simply amplifies its input–including the
DAC’s images at high frequencies–and pass it
through to the transformer and ultimately to the line,
possibly causing the system to fail EMC compliance.
A single capacitor does
not
remove these com-
mon-mode images, it only removes the differential
signal images. However, two separate filter capaci-
tors filter both the common-mode signals and the
differential-mode signals. Be sure to place the ground
connection point of the capacitors next to each other,
and then tie a single ground point at the middle of this
trace.
One of the concerns about any DSL line driver is the
power dissipation. One of the most common ways to
reduce power is by using active termination, aka
synthesized impedance. Refer to TI Application Note
SLOA100 for more information on active termination.
The drawback to active termination is the received
signal is reduced by the same synthesis factor
utilized in the system. Due to the very high attenu-
ation of the line at up to 12 MHz, the receive signal
can be severely diminished. Thus, the use of active
termination should be kept to modest levels at best.
Figure 56 shows an example of utilizing a simple
active termination scheme with a synthesis factor of 2
to achieve the same line power, but with a reduced
power supply voltage that ultimately saves power in
the system.
Figure 56.
The wide bandwidth, high slew rate, and high output
drive current of the THS3092/6 matches the demands
for video distribution for delivering video signals down
multiple cables. To ensure high signal quality with
minimal degradation of performance, a 0.1-dB gain
flatness should be at least 7x the passband fre-
quency to minimize group delay variations from the
amplifier. A high slew rate minimizes distortion of the
video signal, and supports component video and
RGB video signals that require fast transition times
and fast settling times for high signal quality.
Figure 55.
Additionally, level shifting must be done to center the
common-mode voltage appearing at the amplifier’s
noninverting input to optimally the midpoint of the
power
supply.
As
a
ac-coupling/level shifter, a simple high pass filter is
formed. This is generally a good idea for VDSL
systems where the transmit band is typically above 1
MHz, but can be as low as 25 kHz.
side
benefit
of
the
18
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS3096PWPR | HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS |
| THS4001D | 270-MHz HIGH-SPEED AMPLIFIER |
| THS4001EVM | 270-MHz HIGH-SPEED AMPLIFIER |
| THS4051D | 70-MHz HIGH-SPEED AMPLIFIERS |
| THS4051JG | 70-MHz HIGH-SPEED AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS3092DRG4 | 功能描述:高速運(yùn)算放大器 Dual Hig-Vltg Low Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS3092EVM | 功能描述:放大器 IC 開發(fā)工具 THS3092 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS3095 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS |
| THS3095D | 功能描述:高速運(yùn)算放大器 Single Lo-Distort Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS3095DDA | 功能描述:高速運(yùn)算放大器 Single Lo-Distort Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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