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參數資料
| 型號： | THS4275MDREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, SOP-8 |
| 文件頁數： | 16/39頁 |
| 文件大小： | 915K |
| 代理商： | THS4275MDREP |
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THS4271EP
THS4275EP
SGLS270B DECEMBER 2004 REVISED JULY 2008
www.ti.com
23
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 82. 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
33 pF
VO
249
61.9
VI
Figure 83. 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 84. 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 84. 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
instrumentation amplifier, as shown in Figure 85.
_
+
100
VO
VI+
_
+
Rg1
Rf1
100
VI
_
+
Rf2
49.9
Rf1
Rg2
Rf2
49.9
THS4271
Figure 85. 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 high
frequency or power levels, the 2nd harmonic dominates the
total harmonic distortion with a negligible 3rd harmonic
component. Focusing then on the 2nd
harmonic,
increasing the load impedance improves distortion
(1)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS4281 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VERY LOW-POWER, HIGH-SPEED, RAIL-TO-RAIL INPUT AND OUTPUT VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER |
| THS4281D | 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4281DBVR | 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4281DBVRG4 | 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4281DBVT | 功能描述:高速運算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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