參數(shù)資料
型號(hào)： THS4271DRB
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： VIDEO AMPLIFIER, PDSO8
封裝： EXPOSED PAD, LEADLESS, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 15/35頁(yè)
文件大?。?/td> 422K
代理商： THS4271DRB
THS4271
THS4275
SLOS397C – JULY 2002 – REVISED JANUARY 2003
www.ti.com
22
249
_
+
49.9
100
100
14-Bit,
400 MSps
DAC5675
3.3 V
CF
1 nF
249
49.9
1 nF
CF
249
249
_
+
THS4271
RF(out)
IF+
IF–
100
1 nF
Figure 81. Differential Mixer Drive Circuit Using
the DAC5675 and the THS4271
Active Filtering With the THS4271
High-frequency active filtering with the THS4271 is
achievable due to the amplifier’s high slew-rate, wide
bandwidth, and voltage feedback architecture. Several
options are available for high-pass, low-pass, bandpass,
and bandstop filters of varying orders. A simple two-pole
low pass filter is presented here as an example, with two
poles at 100 MHz.
_
+
THS4271
49.9
50
Source
249
6.8
pF
5 V
–5 V
33 pF
VO
249
61.9
VI
Figure 82. A Two-Pole Active Filter With Two
Poles Between 90 MHz and 100 MHz
A Low-Noise Receiver With the THS4271
A combination of two THS4271 amplifiers can create a
high-speed, low-distortion, low-noise differential receiver
circuit as depicted in Figure 83. With both amplifiers
operating in the noninverting mode of operation, the circuit
presents a high load impedance to the source.
The
designer has the option of controlling the impedance
through termination resistors if a matched termination
impedance is desired.
_
+
49.9
100
VO+
VI+
_
+
49.9
100
VO–
499
249
249
100
VI–
Figure 83. A High Input Impedance, Low
Noise, Differential Receiver
A modification on this circuit to include a difference
amplifier turns this circuit into a high-speed instrumenta-
tion amplifier, as shown in Figure 84.
_
+
100
VO
VI+
_
+
Rg1
Rf1
100
VI–
_
+
Rf2
49.9
Rf1
Rg2
Rf2
49.9
THS4271
Figure 84. A High-Speed Instrumentation
Amplifier
V
O +
1
2
1
)
2R
f1
R
g1
V
i
)–Vi–
R
f2
R
g2
THEORY AND GUIDELINES
Distortion Performance
The THS4271 provides excellent distortion performance
into a 150-
load. Relative to alternative solutions, it
provides exceptional performance into lighter loads, as
well as exceptional performance on a single 5-V supply.
Generally, until the fundamental signal reaches very high
frequency or power levels, the 2nd harmonic will dominate
the total harmonic distortion with a negligible 3rd harmonic
component. Focusing then on the 2nd
harmonic,
increasing the load impedance improves distortion
(1)
相關(guān)PDF資料
PDF描述
THS4275DRB VIDEO AMPLIFIER, PDSO8
THS4271MDEP 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4271MDGNTEP 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4271MDREP 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS4275MDEP 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4271DRBR 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-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
THS4271DRBRG4 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-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
THS4271DRBT 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-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
THS4271DRBTG4 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-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
THS4271DRG4 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-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
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