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2-VRMS DirectPath™ line driver with adjustable gain


Features for the DRV632


  • Stereo DirectPath™ Audio Line Driver
    • 2 Vrms Into 10 kΩ With3.3-V Supply
  • Low THD+N < 0.01% at 2 Vrms Into 10 kΩ
  • High SNR, >90 dB
  • 600-Ω Output Load Compliant
  • Differential Input and Single-Ended Output
  • Adjustable Gain by External Gain-Setting Resistors
  • Low DC Offset, <1 mV
  • Ground-Referenced Outputs Eliminate DC-Blocking Capacitors
    • Reduce Board Area
    • Reduce ComponentCost
    • Improve THD+N Performance
    • No Degradation ofLow-Frequency Response Due to OutputCapacitors
  • Short-Circuit Protection
  • Click- and Pop-Reduction Circuitry
  • External Undervoltage Mute
  • Active Mute Control for Pop-Free Audio On/Off Control
  • Space-Saving TSSOP Package


Description for the DRV632


The DRV632 is a 2-VRMS pop-free stereo line driver designed toallow the removal of the output dc-blocking capacitors for reduced component count and cost. Thedevice is ideal for single-supply electronics where size and cost are critical designparameters.

Designed using TI’s patented DirectPath™ technology, The DRV632 is capable of driving 2VRMS into a 10-kΩ load with 3.3-V supply voltage. The device hasdifferential inputs and uses external gain-setting resistors to support a gain range of ±1 V/V to±10 V/V, and gain can be configured individually for each channel. Line outputs have ±8-kV IEC ESDprotection, requiring just a simple resistor-capacitor ESD protection circuit. The DRV632 hasbuilt-in active-mute control for pop-free audio on/off control. The DRV632 has an externalundervoltage detector that mutes the output when the power supply is removed, ensuring a pop-freeshutdown.

Using the DRV632 in audio products can reduce component count considerably compared totraditional methods of generating a 2-VRMS output. The DRV632 does notrequire a power supply greater than 3.3 V to generate its 5.6-Vpp output,nor does it require a split-rail power supply. The DRV632 integrates its own charge pump togenerate a negative supply rail that provides a clean, pop-free ground-biased2-VRMS output.

The DRV632 is available in a 14-pin TSSOP.