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.
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