SLOS432B April   2004  – October 2015 THS4281

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics, VS = 3 V (VS+ = 3 V, VS- = GND)
    6. 6.6 Electrical Characteristics, VS = 5 V (VS+ = 5 V, VS- = GND)
    7. 6.7 Electrical Characteristics, VS = ±5 V
    8. 6.8 Dissipation Ratings
    9. 6.9 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 High-Speed Operational Amplifiers
    2. 7.2 Feature Description
      1. 7.2.1 Wideband, Noninverting Operation
      2. 7.2.2 Wideband, Inverting Operation
    3. 7.3 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Single-Supply Operation
      2. 8.1.2 Driving Capacitive Loads
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Active Filtering With the THS4281
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power-Supply Decoupling Techniques and Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
  • DBV|5
  • DGK|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 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

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)
THS4281 SOIC (8) 4.90 mm × 3.91 mm
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

THS4281 app_dia_los432.gif