+

-

100

2.5

ADS8320

10 nF

500

V BAT

Load

+IN

-IN

V OUT = I RSENSE

0.2 W

I

RSENSE

THS4281

470 pF

470 pF

VBAT

VBAT

W

kW

W

2.5 kW

500 W

VBAT/2

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THS4281

SLOS432B – APRIL 2004 – REVISED OCTOBER 2015

THS4281 Very Low-Power, High-Speed, Rail-to-Rail Input and Output

Voltage-Feedback Operational Amplifier

1 Features

3 Description

Fabricated using the BiCom-II process, the THS4281

1

•

Very Low Quiescent Current: 750

μA (at 5 V)

is a low-power, rail-to-rail input and output, voltage-

•

Rail-to-Rail Input and Output:

feedback operational amplifier designed to operate

–

Common-Mode Input Voltage Extends

over a wide power-supply range of 2.7-V to 15-V

400 mV Beyond the Rails

single supply, and ±1.35-V to ±7.5-V dual supply.

Consuming only 750

μA with a unity gain bandwidth

–

Output Swings Within 150 mV From the Rails

of 90 MHz and a high 35-V/

μs slew rate, the

•

Wide –3-dB Bandwidth at 5 V:

THS4281 allows portable or other power-sensitive

–

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

applications to realize high performance with minimal

power. To ensure long battery life in portable

•

High Slew Rate: 35 V/

μs

applications, the quiescent current is trimmed to be

•

Fast Settling Time (2-V Step):

less than 900

μA at +25°C, and 1 mA from –40°C to

–

78 ns to 0.1%

+85°C.

–

150 ns to 0.01%

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

–

–91 dBc at 100 kHz, –67 dBc at 1 MHz

sensing

applications

without

phase

reversal

•

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

concerns. Its output swings to within 40 mV from the

•

Output Current > 30 mA (10-

Ω Load, 5 V)

rails with 10-k

Ω loads, and 150 mV from the rails with

1-k

Ω loads.

•

Low Voltage Noise of 12.5 nV/

√Hz

•

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

The THS4281 has a good 0.1% settling time of 78 ns,

and 0.01% settling time of 150 ns. The low THD of

•

Packages: SOT23, MSOP, and SOIC

–87 dBc at 100 kHz, coupled with a maximum offset

voltage of less than 2.5 mV, makes the THS4281 a

2 Applications

good match for high-resolution ADCs sampling less

•

Portable/Battery-Powered Applications

than 2 MSPS.

•

High Channel Count Systems

The THS4281 is offered in a space-saving SOT23-5

•

ADC Buffer

package, a small MSOP-8 package, and the industry

standard SOIC-8 package.

•

Active Filters

•

Current Sensing

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SOIC (8)

4.90 mm × 3.91 mm

THS4281

SOT-23 (5)

2.90 mm × 1.60 mm

VSSOP (8)

3.00 mm × 3.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

High-side, Low Power Current-Sensing system

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.