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參數(shù)資料
| 型號： | THS4304DGKR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Wideband Operational Amplifier |
| 中文描述： | 寬帶運算放大器 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 869K |
| 代理商： | THS4304DGKR |
www.ti.com
APPLICATION INFORMATION
For many years, high-performance analog design has required the generation of split power supply voltages, like
±
15 V,
±
8 V, and more recently
±
5 V, in order to realize the full performance of the amplifiers available. Modern
trends in high-performance analog are moving towards single-supply operation at 5 V, 3 V, and lower. This
reduces power supply cost due to less voltages being generated and conserves energy in low power
applications. It can also take a toll on available dynamic range, a valuable commodity in analog design, if the
available voltage swing of the signal must also be reduced.
SNR
Signal
Noise
SFDR
Signal
Spur
GENERAL APPLICATION
The THS4304 is a traditional voltage-feedback topology with wideband performance up to 3 GHz at unity gain.
Care must be taken to ensure that parasitic elements do not erode the phase margin.
HARMONIC DISTORTION
For best second harmonic (HD2), it is important to use a single-point ground between the power supply bypass
capacitors when using a split supply. It is also recommended to use a single ground or reference point for input
termination and gain-setting resistors (R8 and R11 in the non-inverting circuit). It is recommended to follow the
EVM layout closely in your application.
THS4304
SLOS436A–MARCH 2004–REVISED JULY 2004
Two key figures of merit for dynamic range are signal-to-noise ratio (SNR) and spurious free dynamic range
(SFDR).
SNR is simply the signal level divided by the noise:
and SFDR is the signal level divided by the highest spur:
In an operational amplifier, reduced supply voltage typically results in reduced signal levels due to lower voltage
available to operate the transistors within the amplifier. When noise and distortion remain constant, the result is a
commensurate reduction in SNR and SFDR. To regain dynamic range, the process and the architecture used to
make the operational amplifier must have superior noise and distortion performance with lower power supply
overhead required for proper transistor operation.
The THS4304 BiCom3 operational amplifier is just such a device. It is able to provide 2-Vpp signal swing at its
output on a single 5-V supply with noise and distortion performance similar to the best 10-V operational
amplifiers on the market today
Capacitance at the output and inverting input, and resistance and inductance in the feedback path, can cause
problems.
To reduce parasitic capacitance, the ground plane should be removed from under the part.
To reduce inductance in the feedback, the circuit traces should be kept as short and direct as possible. For best
performance in non-inverting unity gain (G=+1V/V), it is recommended to use a wide trace directly between the
output and inverting input.
For a gain of +2V/V, it is recommended to use a 249-
feedback resistor. With good layout, this should keep the
frequency response peaking to around 2 dB. This resistance is high enough to not load the output excessively,
and the part is capable of driving 100-
load with good performance. Higher-value resistors can be used, with
more peaking. For example, 499
gives about 5 dB of peaking, and gives slightly better distortion performance
with 100-
load. Lower value feedback resistors can also be used to reduce peaking, but degrades the distortion
performance with heavy loads.
Power supply bypass capacitors are required for proper operation. The most critical are 0.1-μF ceramic
capacitors; these should be placed as close to the part as possible. Larger bulk capacitors can be shared with
other components in the same area as the operational amplifier.
15
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS4304DGKRG4 | 功能描述:高速運算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| THS4304DR | 功能描述:高速運算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| THS4304DRG4 | 功能描述:高速運算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| THS4304-SP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:RAD-TOLERANT CLASS V, WIDEBAND OPERATIONAL AMPLIFIER |
| THS4422IPW | 制造商:Texas Instruments 功能描述:DUAL FULLY DIFF RAIL-RAIL IN/OUTPUT AMP - Rail/Tube |
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