SNOS760C May   1999  – September 2014 LM7171


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 ±15V DC Electrical Characteristics
    6. 6.6 ±15V AC Electrical Characteristics
    7. 6.7 ±5V DC Electrical Characteristics
    8. 6.8 ±5V AC Electrical Characteristics
    9. 6.9 Typical Performance Characteristics
  7. Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Circuit Operation
    3. 7.3 Slew Rate Characteristic
    4. 7.4 Slew Rate Limitation
    5. 7.5 Compensation For Input Capacitance
    6. 7.6 Application Circuit
  8. Power Supply Recommendations
    1. 8.1 Power Supply Bypassing
    2. 8.2 Termination
    3. 8.3 Driving Capacitive Loads
    4. 8.4 Power Dissipation
  9. Layout
    1. 9.1 Layout Guidelines
      1. 9.1.1 Printed Circuit Board and High Speed Op Amps
      2. 9.1.2 Using Probes
      3. 9.1.3 Component Selection and Feedback Resistor
  10. 10Device and Documentation Support
    1. 10.1 Trademarks
    2. 10.2 Electrostatic Discharge Caution
    3. 10.3 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

9 Layout

9.1 Layout Guidelines

9.1.1 Printed Circuit Board and High Speed Op Amps

There are many things to consider when designing PC boards for high speed op amps. Without proper caution, it is very easy to have excessive ringing, oscillation and other degraded AC performance in high speed circuits. As a rule, the signal traces should be short and wide to provide low inductance and low impedance paths. Any unused board space needs to be grounded to reduce stray signal pickup. Critical components should also be grounded at a common point to eliminate voltage drop. Sockets add capacitance to the board and can affect high frequency performance. It is better to solder the amplifier directly into the PC board without using any socket.

9.1.2 Using Probes

Active (FET) probes are ideal for taking high frequency measurements because they have wide bandwidth, high input impedance and low input capacitance. However, the probe ground leads provide a long ground loop that will produce errors in measurement. Instead, the probes can be grounded directly by removing the ground leads and probe jackets and using scope probe jacks.

9.1.3 Component Selection and Feedback Resistor

It is important in high speed applications to keep all component leads short. For discrete components, choose carbon composition-type resistors and mica-type capacitors. Surface mount components are preferred over discrete components for minimum inductive effect.

Large values of feedback resistors can couple with parasitic capacitance and cause undesirable effects such as ringing or oscillation in high speed amplifiers. For LM7171, a feedback resistor of 510Ω gives optimal performance.