THS4281 Datasheet, PDF (1/43 Pages) Texas Instruments – VERY LOW-POWER, HIGH-SPEED, RAIL-TO-RAIL INPUT AND OUTPUT VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER

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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
•1 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, V_O = 2-V_PP, 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
2 Applications
• Portable/Battery-Powered Applications
• High Channel Count Systems
• ADC Buffer
• Active Filters
• Current Sensing
3 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.
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
V _BAT
500 W
IRSENSE
0.2 W
500 W
Load
470 pF
470 pF
2.5 kW
VBAT
V _OUT = I _RSENSE
-
100 W
+ _{THS4281 10 nF}
2.5 kW
VBAT
+IN
ADS8320
-IN
VBAT/2
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.