SNOSB21D May   2008  – September 2016 LMH6518

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 Timing Requirements
    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 Input Preamplifier
        1. 7.3.1.1 Primary Output Amplifier
        2. 7.3.1.2 Auxiliary Amplifier
      2. 7.3.2 Overvoltage Clamp
      3. 7.3.3 Attenuator
      4. 7.3.4 Digital Control Block
    4. 7.4 Device Functional Modes
      1. 7.4.1 Primary Amplifier
      2. 7.4.2 Auxiliary Output
    5. 7.5 Programming
      1. 7.5.1 Logic Functions
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Oscilloscope Front End
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Settings and ADC SPI Code (ECM)
          2. 8.2.1.2.2 Input and Output Considerations
            1. 8.2.1.2.2.1 Output Swing, Clamping, and Operation Beyond Full Scale
          3. 8.2.1.2.3 Oscilloscope Trigger Applications
        3. 8.2.1.3 Application Curves
      2. 8.2.2 JFET LNA Implementation
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Attenuator Design
        3. 8.2.2.3 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 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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11 Device and Documentation Support

11.1 Device Support

11.1.1 Third-Party Products Disclaimer

TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.

11.1.2 Device Nomenclature

Table 8. Definition of Terms and Specifications

TERM DEFINITION
AV_CM (dB) Change in output offset voltage (ΔVOOS) with respect to the change in input common mode voltage (ΔVI_CM)
AV_DIFF (dB) Gain with 100-Ω differential load
CM Common mode
CMRR (dB) Common mode rejection defined as: AV_DIFF (dB) – AV_CM (dB)
CMRR_CM Common mode rejection relative to VCM defined as: ΔVOOS /ΔVCM
HG Preamp high gain
Ladder Ladder attenuator setting (0-20 dB)
LG Preamp low gain
Max Gain Gain = 38.8 dB
Min Gain Gain = −1.16 dB
+OUT Positive main output
−OUT Negative main output
+OUT AUX Positive auxiliary output
−OUT AUX Negative auxiliary output
PB Phase balance defined as the phase difference between the complimentary outputs relative to 180°
PSRR Input referred VOOS shift divided by change in VCC
PSRR_CM Output common mode voltage change (ΔVO_CM) with respect to VCC voltage change (ΔVCC)
VCM Input pin voltage that sets main output CM
VCM_Aux Input pin voltage that sets auxiliary output CM
VI_CM Input CM voltage (average of +IN and −IN)
ΔVIN (V) Differential voltage across device inputs
VOOS DC offset voltage. Differential output voltage measured with inputs shorted together to VCC/2
VO_CM Output common mode voltage (DC average of V+OUT and V−OUT)
VOS_CM CM offset voltage: VO_CM – VCM
ΔVO_CM Variation in output common mode voltage (VO_CM)
LMH6518 30068804.gif
 Balance error. Measure of the output swing balance of +OUT and −OUT, as reflected on the output common mode voltage (VO_CM), relative to the differential output swing (VOUT). Calculated as output common mode voltage change (ΔVO_CM) divided by the output differential voltage change (ΔVOUT, which is nominally around 700 mVPP)
ΔVOUT Change in differential output voltage (Corrected for DC offset, VOOS)

11.2 Documentation Support

11.2.1 Related Documentation

For related documentation see the following:

Wideband Amplifiers by Peter Staric and Erik Margan, published by Springer (2006). (Section 5.2)

11.3 Receiving Notification of Documentation Updates

To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.

11.4 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.

    TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
    Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.

11.5 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

11.6 Electrostatic Discharge Caution

esds-image

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

11.7 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.