SNOSAL8D April   2006  – September 2021 LMH6321

PRODUCTION DATA  

  1. 1Features
  2. 2Applications
  3. 3Description
  4. 4Revision History
  5. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Operating Ratings
    3. 5.3 Thermal Information
    4. 5.4 ±15 V Electrical Characteristics
    5. 5.5 ±5 V Electrical Characteristics
    6. 5.6 Typical Characteristics
  6. 6Application Hints
    1. 6.1  Buffers
    2. 6.2  Supply Bypassing
    3. 6.3  Load Impedence
    4. 6.4  Source Inductance
    5. 6.5  Overvoltage Protection
    6. 6.6  Bandwidth and Stability
    7. 6.7  Output Current and Short Circuit Protection
    8. 6.8  Thermal Management
      1. 6.8.1 Heatsinking
      2. 6.8.2 Determining Copper Area
      3. 6.8.3 Procedure
      4. 6.8.4 Example
    9. 6.9  Error Flag Operation
    10. 6.10 Single Supply Operation
    11. 6.11 Slew Rate
  7. 7Device and Documentation Support
    1. 7.1 Receiving Notification of Documentation Updates
    2. 7.2 Support Resources
    3. 7.3 Trademarks
    4. 7.4 Electrostatic Discharge Caution
    5. 7.5 Glossary
  8. 8Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • KTW|7
  • DDA|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.2 Supply Bypassing

The method of supply bypassing is not critical for frequency stability of the buffer, and, for light loads, capacitor values in the neighborhood of 1 nF to 10 nF are adequate. However, under fast slewing and large loads, large transient currents are demanded of the power supplies, and when combined with any significant wiring inductance, these currents can produce voltage transients. For example, the LMH6321 can slew typically at 1000 V/μs. Therefore, under a 50 Ω load condition the load can demand current at a rate, di/dt, of 20 A/μs. This current flowing in an inductance of 50 nH (approximately 1.5” of 22 gauge wire) will produce a 1 V transient. Thus, it is recommended that solid tantalum capacitors of 5 μF to 10 μF, in parallel with a ceramic 0.1 μF capacitor be added as close as possible to the device supply pins.

GUID-69356D23-D597-44E7-A6A4-6C986B6A4050-low.gif Figure 6-2 50 Ω Coaxial Cable Driver with Dual Supplies

For values of capacitors in the 10 μF to 100 μF range, ceramics are usually larger and more costly than tantalums but give superior AC performance for bypassing high frequency noise because of their very low ESR (typically less than 10 MΩ) and low ESL.