SBOS780C March   2016  – June 2021 THS3215

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: D2S
    6. 6.6  Electrical Characteristics: OPS
    7. 6.7  Electrical Characteristics: D2S + OPS
    8. 6.8  Electrical Characteristics: Midscale (DC) Reference Buffer
    9. 6.9  Typical Characteristics: D2S + OPS
    10. 6.10 Typical Characteristics: D2S Only
    11. 6.11 Typical Characteristics: OPS Only
    12. 6.12 Typical Characteristics: Midscale (DC) Reference Buffer
    13. 6.13 Typical Characteristics: Switching Performance
    14. 6.14 Typical Characteristics: Gain Drift
  7. 7 Parameter Measurement Information
    1. 7.1 Overview
    2. 7.2 Frequency Response Measurement
    3. 7.3 Harmonic Distortion Measurement
    4. 7.4 Noise Measurement
    5. 7.5 Output Impedance Measurement
    6. 7.6 Step-Response Measurement
    7. 7.7 Feedthrough Measurement
    8. 7.8 Midscale Buffer ROUT Versus CLOAD Measurement
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Differential to Single-Ended Stage (D2S) With Fixed Gain of 2 V/V (Pins 2, 3, 6, and 14)
      2. 8.3.2 Midscale (DC) Reference Buffer (Pin 1 and Pin 15)
      3. 8.3.3 Output Power Stage (OPS) (Pins 4, 7, 9, 10, 11, and 12)
        1. 8.3.3.1 Output DC Offset and Drift for the OPS
        2. 8.3.3.2 OPS Harmonic Distortion (HD) Performance
        3. 8.3.3.3 Switch Feedthrough to the OPS
        4. 8.3.3.4 Driving Capacitive Loads
      4. 8.3.4 Digital Control Lines
    4. 8.4 Device Functional Modes
      1. 8.4.1 Full-Signal Path Mode
        1. 8.4.1.1 Internal Connection With Fixed Common-Mode Output Voltage
        2. 8.4.1.2 Internal Connection With Adjustable Common-Mode Output Voltage
        3. 8.4.1.3 External Connection
      2. 8.4.2 Dual-Output Mode
      3. 8.4.3 Differential I/O Voltage Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Typical Applications
        1. 9.1.1.1 High-Frequency, High-Voltage, Dual-Output Line Driver for AWGs
          1. 9.1.1.1.1 Design Requirements
          2. 9.1.1.1.2 Detailed Design Procedure
          3. 9.1.1.1.3 Application Curves
        2. 9.1.1.2 High-Voltage Pulse-Generator
          1. 9.1.1.2.1 Design Requirements
          2. 9.1.1.2.2 Detailed Design Procedure
          3. 9.1.1.2.3 Application Curves
        3. 9.1.1.3 Single-Supply, AC-Coupled, Piezo Element Driver
          1. 9.1.1.3.1 Detailed Design Procedure
        4. 9.1.1.4 Output Common-Mode Control Using the Midscale Buffer as a Level Shifter
          1. 9.1.1.4.1 Detailed Design Procedure
        5. 9.1.1.5 Differential I/O Driver With independent Common-Mode Control
          1. 9.1.1.5.1 Detailed Design Procedure
  10. 10Power Supply Recommendations
    1. 10.1 Thermal Considerations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 TINA-TI (Free Software Download)
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

8.4.1.2 Internal Connection With Adjustable Common-Mode Output Voltage

The simplest modification to this starting configuration is using the midscale buffer to drive the VREF pin with either a dc or ac source into VMID_IN (pin 1), shown in Figure 8-16.

GUID-F64F692D-2FF2-4374-B6F8-882552083CF7-low.gif Figure 8-16 Differential to Single-Ended, Gain of 5 V/V Configuration With VREF Driven by the Midscale Buffer

The VREF input is used to offset the output of the D2S that is then amplified by the OPS. Correct the total dc offset at the output of the OPS by adjusting the voltage at VMID_IN (pin 1). Use the on-chip midscale buffer as a low-impedance source to drive the correction voltage to the VREF pin. A wideband small-signal source can also be summed into this path with a gain of 1 V/V to the D2S output pin. Figure 6-49 shows the midscale buffer to have an extremely flat response through 100 MHz for < 100 mVPPswings, while 1 VPP is supported through 20 MHz with a flat response.

From this point on, the diagrams are simplified to not show the power-supply elements. However, the supplies are required by any application, as described in the Section 9 section.