Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier - THS4281

THS4281 (ACTIVE)

Very Low-Power High Speed Rail-To-Rail Input/Output Voltage Feedback Operational Amplifier

 

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.

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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Parametrics Compare all products in High-Speed Op Amps (GBW>=50MHz)

 
Architecture
Number of Channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
BW @ Acl (MHz)
Acl, min spec gain (V/V)
Slew Rate (Typ) (V/us)
Vn at Flatband (Typ) (nV/rtHz)
Vn at 1kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (Offset Voltage @ 25C) (Max) (mV)
Rail-to-Rail
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CMRR (Typ) (dB)
Input Bias Current (Max) (pA)
Offset Drift (Typ) (uV/C)
GBW (Typ) (MHz)
Output Current (Typ) (mA)
2nd Harmonic (dBc)
3rd Harmonic (dBc)
@ MHz
THS4281 OPA2835 OPA2836 OPA835 OPA836
Bipolar
Voltage FB   
Bipolar
Voltage FB   
Bipolar
Voltage FB   
Bipolar
Voltage FB   
Bipolar
Voltage FB   
1    2    2    1    1   
2.7    2.5    2.5    2.5    2.5   
16.5    5.5    5.5    5.5    5.5   
95    56    205    56    205   
1    1    1    1    1   
35    160    560    160    560   
12.5    9.3    4.6    9.3    4.6   
12.5    10    4.6    9.3    4.6   
0.8    0.25    1    0.25    1   
2.5    0.5    0.4    0.5    0.4   
In
Out   
In to V-
Out   
In to V-
Out   
In to V-
Out   
In to V-
Out   
N/A    Shutdown    Small Size
Shutdown   
Small Size
Shutdown   
Small Size
Shutdown   
Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
SOIC
SOT-23
VSSOP   
QFN
SOIC
UQFN
VSSOP   
QFN
SOIC
UQFN
VSSOP   
QFN
SOT-23   
QFN
SOT-23   
8SOIC: 29 mm2: 6 x 4.9(SOIC)
5SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
10QFN: 4 mm2: 2 x 2(QFN)
8SOIC: 29 mm2: 6 x 4.9(SOIC)
10UQFN: 4 mm2: 2 x 2(UQFN)
10VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
10QFN: 4 mm2: 2 x 2(QFN)
8SOIC: 29 mm2: 6 x 4.9(SOIC)
10UQFN: 4 mm2: 2 x 2(UQFN)
10VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
10QFN: 4 mm2: 2 x 2(QFN)
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
10QFN: 4 mm2: 2 x 2(QFN)
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
107    113    116    113    116   
800000    400000    1000000    400000    1000000   
7    2.25    1.1    2.25    1.1   
95    30    120    30    120   
30    40    50    40    50   
69    70    85    70    85   
76    73    79    73    79   
1    1    1    1    1   

WEBENCH® Designer THS4281

Amplifier Topology
 Non-inverting
 Inverting
Desired Power Supply Voltage
Positive Supply (Vcc):  V
Negative Supply (Vee):  V
Allowed Power Supply(Vcc-Vee) = 2.7 to 16.5 V
Desired Input and Output Requirements
  Min Max
Vin  V  V
Vout  V  V
Minimum Temperature = -40.0 °C
Maximum Temperature = 85.0 °C