THS4281

极低功耗高速轨至轨输入/输出电压反馈运算放大器

Fabricated using the BiCom-II process, the is a low-power, rail-to-rail input and output, voltage-feedback operational amplifier designed to operate over a wide power-supply range of 2.7-V to 15-V single supply, and ±1.35-V to ±7.5-V dual supply. Consuming only 750 µA with a unity gain bandwidth of 90 MHz and a high 35-V/µs slew rate, the THS4281 allows portable or other power-sensitive applications to realize high performance with minimal power. To ensure long battery life in portable applications, the quiescent current is trimmed to be less than 900 µA at +25°C, and 1 mA from –40°C to +85°C.

The THS4281 is a true single-supply amplifier with a specified common-mode input range of 400 mV beyond the rails. This allows for high-side current sensing applications without phase reversal concerns. Its output swings to within 40 mV from the rails with 10-kΩ loads, and 150 mV from the rails with 1-kΩ loads.

The THS4281 has a good 0.1% settling time of 78 ns, and 0.01% settling time of 150 ns. The low THD of –87 dBc at 100 kHz, coupled with a maximum offset voltage of less than 2.5 mV, makes the THS4281 a good match for high-resolution ADCs sampling less than 2 MSPS.

The THS4281 is offered in a space-saving SOT23-5 package, a small MSOP-8 package, and the industry standard SOIC-8 package.

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Very Low Quiescent Current: 750 µA at 5 V

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Rail-to-Rail Input and Output:

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Common-Mode Input Voltage Extends

400 mV Beyond the Rails

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Output Swings Within 150 mV From the Rails

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Wide –3-dB Bandwidth at 5 V:

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90 MHz at Gain = +1, 40 MHz at Gain = +2

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High Slew Rate: 35 V/µs

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Fast Settling Time 2-V Step:

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78 ns to 0.1%

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150 ns to 0.01%

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Low Distortion at Gain = +2, VO = 2-VPP, 5 V:

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–91 dBc at 100 kHz, –67 dBc at 1 MHz

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Input Offset Voltage: 2.5 mV Max at +25°C

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Output Current > 30 mA 10-Ω Load, 5 V

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Low Voltage Noise of 12.5 nV/√Hz

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Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V

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Packages: SOT23, MSOP, and SOIC

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APPLICA ONS

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Portable/Battery-Powered Applications

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High Channel Count Systems

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ADC Buffer

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Active Filters

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Current Sensing

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