SBOS735 September   2015 OPA2171-EP

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
    6. 6.6 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 Operating Characteristics
      2. 7.3.2 Phase-Reversal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Common-Mode Voltage Range
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Electrical Overstress
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Capacitive Load and Stability
      3. 8.2.3 Application Curve
  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 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7 Detailed Description

7.1 Overview

The OPA2171-EP operational amplifier provides high overall performance, making it ideal for many general-purpose applications. The excellent offset drift of only 2 µV/°C provides excellent stability over the entire temperature range. In addition, the device offers very good overall performance with high CMRR, PSRR, and AOL. As with all amplifiers, applications with noisy or high-impedance power supplies require decoupling capacitors close to the device pins. In most cases, 0.1-µF capacitors are adequate.

7.2 Functional Block Diagram

OPA2171-EP fbd_sbos735.gif

7.3 Feature Description

7.3.1 Operating Characteristics

The OPA2171-EP amplifier is specified for operation from 2.7 to 36 V (±1.35 to ±18 V). Many of the specifications apply from –55°C to 125°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are presented in Typical Characteristics.

7.3.2 Phase-Reversal Protection

The OPA2171-EP has an internal phase-reversal protection. Many operational amplifiers exhibit a phase reversal when the input is driven beyond its linear common-mode range. This condition is most often encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range, causing the output to reverse into the opposite rail. The input of the OPA2171-EP prevents phase reversal with excessive common-mode voltage. Instead, the output limits into the appropriate rail. Figure 37 shows this performance.

OPA2171-EP tc_no_phase_bos516.gif Figure 37. No Phase Reversal

7.4 Device Functional Modes

7.4.1 Common-Mode Voltage Range

The input common-mode voltage range of the OPA2171-EP extends 100 mV below the negative rail and within 2 V of the top rail for normal operation.

This device can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within 2 V of the top rail. Table 2 summarizes the typical performance in this range.

Table 2. Typical Performance Range

PARAMETER MIN TYP MAX UNIT
Input Common-Mode Voltage (V+) – 2 (V+) + 0.1 V
Offset voltage 7 mV
vs Temperature 12 µV/°C
Common-mode rejection 65 dB
Open-loop gain 60 dB
GBW 0.7 MHz
Slew rate 0.7 V/µs
Noise at ƒ = 1kHz 30 nV/√Hz