SBOS673 September 2017 OPA837

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics: VS = 5 V
    6. 6.6Electrical Characteristics: VS = 3 V
    7. 6.7Typical Characteristics: VS = 5.0 V
    8. 6.8Typical Characteristics: VS = 3.0 V
    9. 6.9Typical Characteristics: ±2.5-V to ±1.5-V Split Supply
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagrams
    3. 7.3Feature Description
      1. 7.3.1OPA837 Comparison
      2. 7.3.2Input Common-Mode Voltage Range
      3. 7.3.3Output Voltage Range
      4. 7.3.4Power-Down Operation
      5. 7.3.5Low-Power Applications and the Effects of Resistor Values on Bandwidth
      6. 7.3.6Driving Capacitive Loads
    4. 7.4Device Functional Modes
      1. 7.4.1Split-Supply Operation (±1.35 V to ±2.7 V)
      2. 7.4.2Single-Supply Operation (2.7 V to 5.4 V)
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1 Noninverting Amplifier
      2. 8.1.2 Inverting Amplifier
      3. 8.1.3 Output DC Error Calculations
      4. 8.1.4 Output Noise Calculations
      5. 8.1.5 Instrumentation Amplifier
      6. 8.1.6 Attenuators
      7. 8.1.7 Differential to Single-Ended Amplifier
      8. 8.1.8 Differential-to-Differential Amplifier
      9. 8.1.9 Pulse Application With Single-Supply Circuit
      10. 8.1.10ADC Driver Performance
    2. 8.2Typical Applications
      1. 8.2.1Active Filters
        1. 8.2.1.1Design Requirements
        2. 8.2.1.2Detailed Design Procedure
        3. 8.2.1.3Application Curves
      2. 8.2.2Implementing a 2:1 Active Multiplexer
        1. 8.2.2.1Design Requirements
        2. 8.2.2.2Detailed Design Procedure
      3. 8.2.31-Bit PGA Operation
        1. 8.2.3.1Design Requirements
        2. 8.2.3.2Detailed Design Procedure
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Receiving Notification of Documentation Updates
    3. 11.3Community Resources
    4. 11.4Trademarks
    5. 11.5Electrostatic Discharge Caution
    6. 11.6Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • Bandwidth: 105 MHz (AV = 1 V/V)
  • Very Low (Trimmed) Supply Current: 600 µA
  • Gain Bandwidth Product: 50 MHz
  • Slew Rate: 105 V/µs
  • Negative Rail Input, Rail-to-Rail Output
  • 25°C Input Offset: ±130 µV (Max)
  • Input Offset Voltage Drift (DCK Package):
    < ±1.6 µV/°C (Maximum)
  • Input Voltage Noise: 4.7 nV/√Hz (> 100 Hz)
  • HD2: –120 dBc at 2 VPP, 100 kHz
  • HD3: –145 dBc at 2 VPP, 100 kHz
  • Settling Time: 35 ns, 0.5-V Step to 0.1%
  • 5-µA Shutdown Current With Fast Recovery From
    Shutdown for Power Scaling Applications

Applications

  • 12-Bit to 16-Bit, Low-Power SAR Drivers
  • Precision ADC Reference Buffers
  • Very-Low-Power Active Filters
  • Low-Power Transimpedance Amplifiers
  • Sensor Signal Conditioning
  • Wearable Devices
  • Low-Side Current Sensing

Description

The OPA837 device is a unity-gain stable, voltage-feedback op amp that provides among the highest MHz per mW of bandwidth versus power among precision op amps. Using only 600 µA on a single 5-V supply, this 3.0-mW device delivers 105-MHz bandwidth at a gain of 1 V/V. The very low trimmed offset voltage of ±130 µV (maximum) comes with a typical (±1σ) drift of ±0.4 µV/°C.

Ideally suited to single-ended, successive-approximation register (SAR) analog-to-digital-converter (ADC) driving applications, the OPA837 provides one of the lowest input spot noise levels at 4.7 nV/√Hz for the 3-mW quiescent power. The very high 50-MHz gain bandwidth product provides the low output impedance to high frequencies required to supply the fast charging currents in SAR ADC driver applications. This low dynamic output impedance is also suitable for reference buffer applications with precision ADCs. The single-channel OPA837 is available in a 6-pin SOT-23 package (that includes a power shutdown feature) and a 5-pin SC70 package.

The OPA837 is characterized for operation over the a wide temperature range of –40°C to +125°C.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
OPA837SOT-23 (6)2.90 mm × 1.60 mm
SC70 (5)2.00 mm × 1.25 mm
  1. For all available packages, see the package option addendum at the end of the data sheet.

Low-Power, Low-Noise, Precision, Single-Ended SAR ADC Driver With
True Ground Input and Output Range

OPA837 OPA837-front-page-diagram-sbos673.gif