描述 Description

Fabricated using the BiCom-II process, the THS4281 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.

特性 Features

? Very Low Quiescent Current: 750 μA (at 5 V)
? Rail-to-Rail Input and Output:
? Common-Mode Input Voltage Extends 400 mV Beyond the Rails
? Output Swings Within 150 mV From the Rails

? Wide –3-dB Bandwidth at 5 V:
? 90 MHz at Gain = +1, 40 MHz at Gain = +2

? High Slew Rate: 35 V/μs
? Fast Settling Time (2-V Step):
? 78 ns to 0.1%
? 150 ns to 0.01%

? Low Distortion at Gain = +2, VO = 2-VPP, 5 V:
? –91 dBc at 100 kHz, –67 dBc at 1 MHz

? Input Offset Voltage: 2.5 mV (Max at +25°C)
? Output Current > 30 mA (10-Ω Load, 5 V)
? Low Voltage Noise of 12.5 nV/√Hz
? Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V
? Packages: SOT23, MSOP, and SOIC
? APPLICATIONS
? Portable/Battery-Powered Applications
? High Channel Count Systems
? ADC Buffer
? Active Filters
? Current Sensing

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