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  • OPAx145 High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz JFET Operational Amplifiers

    • SBOS427F June   2017  – March 2021 OPA145 , OPA2145

      PRODUCTION DATA  

  • CONTENTS
  • SEARCH
  • OPAx145 High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz JFET Operational Amplifiers
  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: OPA145
    5. 6.5 Thermal Information: OPA2145
    6. 6.6 Electrical Characteristics: VS = 4.5 V to 36 V; ±2.25 V to ±18 V
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Capacitive Load and Stability
      2. 7.3.2 Output Current Limit
      3. 7.3.3 Noise Performance
      4. 7.3.4 Basic Noise Calculations
      5. 7.3.5 Phase-Reversal Protection
      6. 7.3.6 Electrical Overstress
      7. 7.3.7 EMI Rejection
      8. 7.3.8 EMIRR +IN Test Configuration
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
      1. 8.3.1 16-Bit, 100-kSPS, Fully Differential Transimpedance Imaging and Measurement
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 TINA-TI™ SImulation Software (Free Download)
        2. 11.1.1.2 WEBENCH Filter Designer Tool
        3. 11.1.1.3 TI Precision Designs
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • D|8
    • MSOI002K
  • DGK|8
    • MPDS028E
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • sbos427f_oa
  • sbos427f_pm
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DATA SHEET

OPAx145 High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz JFET Operational Amplifiers

1 Features

  • Best bandwidth and slew-rate-to-power ratio:
    • gain-bandwidth product: 5.5 MHz
    • Slew rate: 20 V/μs
    • Low supply current: 475 µA (maximum)
  • High precision:
    • Very low offset: 150 μV (maximum)
    • Very low offset drift: 1 μV/°C (maximum)
  • Low input bias current: 2 pA
  • Excellent noise performance:
    • Very low voltage noise: 7 nV/√Hz
    • Very low current noise: 0.8 fA/√ Hz
  • Input-voltage range includes V– supply
  • Single-supply operation: 4.5 V to 36 V
  • Dual-supply operation: ±2.25 V to ±18 V

2 Applications

  • Semiconductor test
  • Lab and field instrumentation
  • Source measurement unit (SMU)
  • Weigh scale
  • Intra-DC interconnect (metro)
  • Merchant network and server PSU
  • DC power supply, ac source, electronic load
  • Data acquisition (DAQ)

 

3 Description

The OPA145 and OPA2145 (OPAx145) devices are part of a family of low-power JFET input amplifier that have excellent drift, low current noise, and pico-ampere input bias current. These features make the OPAx145 an excellent choice for amplifying small signals from high-impedance sensors.

The rail-to-rail output swing interfaces to modern, single-supply, precision, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). In addition, the input range that includes V– allows designers to simplify power management and take advantage of the single-supply, low-noise JFET architecture.

Device Information(1)
PART NUMBERPACKAGEBODY SIZE (NOM)
OPA145SOIC (8)4.90 mm × 3.91 mm
VSSOP (8)3.00 mm × 3.00 mm
SOT-23 (5)2.90 mm × 1.60 mm
OPA2145 SOIC (8) 4.90 mm × 3.91 mm
VSSOP (8) 3.00 mm × 3.00 mm
(1) For all available packages, see the package option addendum at the end of the data sheet.
GUID-F38D9AFB-10E2-44B5-95D2-D43C0D9EB2D4-low.gifOPAx145 Excels in 16-bit, 100-kSPS Fully Differential Transimpedance Imaging Application
GUID-3912ACB5-7FE7-4538-A350-20A7601DB195-low.pngOPAx145 Precision JFET Technology Offers Excellent Linear Input Impedance

4 Revision History

Changes from Revision E (October 2020) to Revision F (February 2021)

  • Changed OPA2145 D (SOIC-8) and DGK VSSOP-8) packages from advanced information (preview) to production data (active)Go
  • Changed offset voltage drift specification to differentiate between OPA145 and OPA2145Go
  • Changed PSRR specification to differentiate between OPA145 and OPA2145Go

Changes from Revision D (June 2020) to Revision E (October 2020)

  • Updated the numbering format for tables, figures, and cross-references throughout the documentGo
  • Added OPA2145 advanced information (preview) DGK (VSSOP-8) package and associated contentGo
  • Deleted Operating Voltage section; redundant informationGo

Changes from Revision C (July 2018) to Revision D (June 2020)

  • Added OPA2145 advanced information (preview) device D (SOIC-8) package and associated contentGo

Changes from Revision B (May 2018) to Revision C (July 2018)

  • Deleted "preview" from information re: DBV (SOT-23) package, now released Go
  • Changed status of data sheet to production data Go

Changes from Revision A (March 2018) to Revision B (May 2018)

  • Deleted "preview" from information re: DGK (VSSOP) package, now released Go

Changes from Revision * (June 2017) to Revision A (March 2018)

  • Added preview of DBV and DGK packages; removed content regarding future device releases Go

5 Pin Configuration and Functions

GUID-B4918EE0-1026-4770-A2DB-82E83EE0724D-low.gifFigure 5-1 OPA145: D (8-Pin SOIC) and
DGK (8-Pin VSSOP) Packages, Top View
GUID-DC5DD996-5B90-4E5F-9948-299544AD2B75-low.gifFigure 5-2 OPA145: DBV (5-Pin SOT-23) Package, Top View
Table 5-1 Pin Functions: OPA145
PIN I/O DESCRIPTION
NAME OPA145
D (SOIC),
DGK (VSSOP)		 DBV (SOT-23)
–IN 2 4 I Inverting input
+IN 3 3 I Noninverting input
NC 1, 5, 8 — — No internal connection (can be left floating)
OUT 6 1 O Output
V– 4 2 — Negative (lowest) power supply
V+ 7 5 — Positive (highest) power supply
GUID-1105425F-FF67-451D-AC89-4A929538AC10-low.gifFigure 5-3 OPA2145: D (8-Pin SOIC) and DGK (8-Pin VSSOP) Packages, Top View
Table 5-2 Pin Functions: OPA2145
PIN I/O DESCRIPTION
NAME OPA2145
D (SOIC),
DGK (VSSOP)
–IN A 2 I Inverting input channel A
+IN A 3 I Noninverting input channel A
–IN B 6 I Inverting input channel B
+IN B 5 I Noninverting input channel B
OUT A 1 O Output channel A
OUT B 7 O Output channel B
V– 4 — Negative supply
V+ 8 — Positive supply

 
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