SBOS874 August 2017 THS4561

ADVANCE INFORMATION for pre-production products; subject to change without notice. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics: VS+ - VS- = 10 V
    6. 7.6Electrical Characteristics: VS+ - VS- = 5 V
    7. 7.7Electrical Characteristics: VS+ - VS- = 3 V
  8. Parameter Measurement Information
    1. 8.1Example Characterization Circuits
    2. 8.2Output Interface Circuit for DC-Coupled Differential Testing
    3. 8.3Output Common-Mode Measurements
    4. 8.4Differential Amplifier Noise Measurements
    5. 8.5Balanced Split-Supply Versus Single-Supply Characterization
    6. 8.6Simulated Characterization Curves
    7. 8.7Terminology and Application Assumptions
  9. Detailed Description
    1. 9.1Overview
    2. 9.2Functional Block Diagram
    3. 9.3Feature Description
    4. 9.4Device Functional Modes
      1. 9.4.1Shutdown Mode
      2. 9.4.2Single-Ended Source to Differential Output Mode
        1. 9.4.2.1AC-Coupled Signal Path Considerations for Single-Ended Input to Differential Output Conversions
        2. 9.4.2.2DC-Coupled Input Signal Path Considerations for Single-Ended to Differential Conversions
      3. 9.4.3Differential Input to a Differential Output Mode
        1. 9.4.3.1AC-Coupled, Differential-Input to Differential-Output Design Issues
  10. 10Application and Implementation
    1. 10.1Application Information
      1. 10.1.1Differential Open-Loop Gain and Output Impedance
      2. 10.1.2Setting Resistor Values Versus Gain
      3. 10.1.3Noise Analysis
      4. 10.1.4Factors Influencing Harmonic Distortion
      5. 10.1.5Driving Capacitive Loads
      6. 10.1.6Input Overdrive Performance
    2. 10.2Typical Application
      1. 10.2.1Design Requirements
      2. 10.2.2Detailed Design Procedure
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1Layout Guidelines
      1. 12.1.1Board Layout Recommendations
    2. 12.2Layout Example
  13. 13Device and Documentation Support
    1. 13.1Documentation Support
    2. 13.2Receiving Notification of Documentation Updates
    3. 13.3Community Resources
    4. 13.4Trademarks
    5. 13.5Electrostatic Discharge Caution
    6. 13.6Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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Features

  • Bandwidth: 70 MHz (G = 1 V/V)
  • Differential Output Slew Rate: 130 V/µs
  • Gain Bandwidth Product: 60 MHz
  • Negative Rail Input (NRI)
  • Rail-to-Rail Output (RRO)
  • Wide Output Common-Mode Control Range
  • Single-Supply Operating Range: 2.85 V to 12.6 V
  • Trimmed-Supply Current: 830 µA at ±5 V
  • 25°C Input Offset: ±200 µV (Maximum)
  • Input Offset Voltage Drift: ±2 µV/°C (Maximum)
  • Differential Input Voltage Noise: 4.5 nV/√Hz
  • Very Low 50–Hz 1/f Voltage Noise Corner
  • Very Low Harmonic Distortion
    • HD2: –115 dBc at 2-VPP, 100-kHz
    • HD3: –110 dBc at 2-VPP, 100-kHz
  • < 4-V Step Response Settling to 0.01%: < 100 ns

Applications

  • 16-Bit to 20-Bit, Differential, High-Speed SAR Drivers
  • Differential Active Filters
  • Differential Transimpedance Amplifiers
  • High Output Swing PCM Audio DAC Outputs
  • Ultrasound Differential TGC Drivers
  • Lower Power Alternate to the THS4551

Description

The THS4561 fully differential amplifier (FDA) offers a simple interface from single-ended sources to the differential output required by high-precision analog-to-digital converters (ADCs). Designed for exceptional dc accuracy, low noise, and ultra-low harmonic distortion, the device is well suited for data acquisition systems where high precision is required with the best signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR) through the amplifier and ADC combination.

The THS4561 features the required negative rail input when interfacing a dc-coupled, ground-centered, source signal to a single-supply, differential-input ADC. Very low dc error and drift terms support the emerging 16-bit to 20-bit successive approximation register (SAR) input requirements. A 2.85-V to 12.6-V supply range with a flexible output common-mode setting with low headroom to the supplies supports a wide range of ADC input and digital-to-analog converter (DAC) output requirements.

The THS4561 will be available in a dual-channel device as the THS4562 in a VQFN-24 package.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
THS4561VSSOP (8)3.00 mm × 3.00 mm
VQFN (16)3.00 mm × 3.00 mm
VQFN (10)2.00 mm × 2.00 mm
  1. For all available packages, see the package option addendum at the end of the data sheet.

Gain of 10 V/V PCM Audio DAC Output With Second-Order MFB Filter at 50 kHz

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