DRV612PW

Audio Amplifiers Overview

The DRV612PW is a single-ended, stereo line driver utilizing DirectPath technology to eliminate output DC-blocking capacitors. It operates on a single 3-V to 3.6-V supply and generates an internal negative rail via a charge pump. The device delivers a 2-Vrms output into a 600-Ω load with SNR exceeding 105 dB at –1× gain. It features programmable gain settings ranging from –1× to –10×, active mute control providing over 80-dB attenuation, and ±8-kV HBM ESD protection on outputs.

Audio Amplifiers Feature Summary

• DirectPath architecture eliminates the need for bulky output DC-blocking capacitors by generating an internal negative supply rail.
• Programmable gain selection allows designers to choose from 13 internal gain values using a single external resistor.
• Built-in pop suppression circuitry ensures click-free power-up and power-down sequences.
• Outputs feature robust ±8-kV human-body model ESD protection.

Audio Amplifiers Applications

• PDP and LCD TVs
• DVD players
• Mini and micro combo systems
• Soundcards

Audio Amplifiers Procurement Notes

Verify the package type matches the required footprint; the PW suffix indicates a 14-pin TSSOP. Confirm that the design supports a single 3-V to 3.6-V supply voltage. Ensure input coupling capacitors are selected to block DC bias from the source while maintaining the desired low-frequency response. Check that the GAIN pin is properly terminated to set the intended amplification level.

Audio Amplifiers Selection Notes

Select this component when minimizing board space and BOM cost is critical due to the removal of output capacitors. It is suitable for single-supply applications where split-rail supplies are unavailable. Consider the programmable gain options if interfacing with various codec output levels. Verify that the 2-Vrms output capability meets the requirements of the downstream audio stage or load impedance.

Audio Amplifiers Part Context

The DRV612 belongs to Texas Instruments' DirectPath family of audio drivers. It shares pin compatibility with the TPA6139A2 headphone amplifier, allowing for flexible PCB layout options. Unlike traditional line drivers requiring large coupling capacitors, it integrates a charge pump to create a virtual ground, simplifying the design for portable and consumer electronics.

Audio Amplifiers Replacement Considerations

The TPA6139A2 is a footprint-compatible alternative offering headphone driving capabilities instead of line-level outputs. For adjustable gain variants, consider the DRV603 or DRV604 series. The DRV632 serves as another comparable option within the same product family.

Audio Amplifiers FAQ

How does the DRV612 eliminate the need for output DC-blocking capacitors?

It uses an internal charge pump to generate a negative supply rail (VSS), allowing the output to swing symmetrically around ground without requiring external blocking capacitors.

What happens if the GAIN pin is left unconnected?

If the GAIN pin is left floating, an internal pullup sets the default gain to –2×.

How is pop-free operation achieved during power cycles?

Pop-free operation is ensured by keeping the MUTE pin low during the power-supply ramp-up and ramp-down until input AC-coupling capacitors are fully charged.