Texas Instruments DRV632PWR

Overview

DRV632 from Texas Instruments is a stereo DirectPath™ audio line driver IC designed for ground-referenced 2-V_RMS output into 10-kΩ loads using only a 3.3-V single supply. It features differential inputs, ±1 V/V to ±10 V/V adjustable gain per channel via external resistors, <0.01% THD+N at 2 V_RMS, >90 dB SNR, and integrated charge-pump negative rail generation-enabling pop-free audio in set-top boxes and LCD TVs without DC-blocking capacitors.

For engineers reviewing the DRV632 datasheet, DRV632 pinout, DRV632 application, or DRV632 equivalent, key selection considerations include its 14-pin TSSOP package, 600-Ω minimum load compliance, active mute control, external undervoltage protection (UVP) interface, and differential-input/single-ended-output architecture optimized for cost-sensitive consumer audio systems.

Technical Context

The DRV632 implements TI's patented DirectPath™ architecture with an internal charge pump generating a clean negative rail (PVSS), enabling true ground-referenced 2-V_RMS outputs without output coupling capacitors. Its dual-channel opamp structure supports independent gain configuration and second-order active filtering capability.

Differential input stages require external AC-coupling capacitors to block source DC offset, while the Mute pin (active-low) and UVP pin (1.25-V threshold with hysteresis) provide system-level control over power-up/down sequencing and pop-free operation. The device operates within 3 V to 3.6 V supply range and delivers <1 mV output offset voltage.

Key Specifications

Pinout & Package

The DRV632 is housed in a 14-pin TSSOP package (5.00 mm × 4.40 mm body size) with exposed thermal pad (not electrically connected). Pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo line driver applications.

Compared with DRV632, DRV603 offers reduced output voltage and lower cost but sacrifices 0.35-V_RMS drive capability and 10-dB SNR margin; DRV612 retains full pin compatibility and similar performance but trades 10-dB SNR for lower unit cost in volume production.

Availability

DRV632 is available at Aetrix Electronics and suitable for set-top boxes, Blu-ray players, and LCD TVs requiring stable component supply, long-term lifecycle assurance, and consistent electrical performance across manufacturing lots.

Supply support for DRV632 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of innovation in audio signal chain solutions.

The DRV632 belongs to TI's DirectPath™ line driver product line, engineered specifically to eliminate output DC-blocking capacitors in single-supply consumer audio systems while maintaining studio-grade THD+N and SNR performance.

FAQ

What is the maximum output voltage swing of the DRV632?

The DRV632 delivers up to 2.4 V_RMS (5.6-V_PP) into a 10-kΩ load with a 3.3-V supply. This is achieved using its integrated charge pump to generate a negative rail, enabling true ground-referenced output without external dual supplies. The DRV632 specification guarantees ≥2 V_RMS under all recommended operating conditions.

Does the DRV632 require external DC-blocking capacitors on its outputs?

No, the DRV632 does not require external DC-blocking capacitors on its outputs due to its DirectPath™ architecture and internal charge pump that generates a symmetric bipolar output swing centered at 0 V. This eliminates the need for large electrolytic capacitors, reducing PCB area and improving low-frequency response. Input-side AC-coupling capacitors remain necessary for differential input biasing.

How is gain configured on the DRV632?

Gain on the DRV632 is configured per channel using external resistors: R_IN between each inverting input (–INL/–INR) and ground, and R_FB between each output (OUTL/OUTR) and corresponding inverting input. The gain formula is G = –R_FB/R_IN, supporting ±1 V/V to ±10 V/V. Recommended values are documented in the datasheet's Table 1, e.g., 15 kΩ/30 kΩ for –2 V/V.

What protection features does the DRV632 include?

The DRV632 integrates short-circuit protection, ±8-kV IEC ESD protection on outputs, active click-and-pop suppression during mute transitions, and external undervoltage protection (UVP) via Pin 11. The UVP pin triggers automatic mute when supply voltage falls below 1.25 V, preventing audible artifacts during brownout or shutdown sequences. Output impedance drops to 110 mΩ when muted.

Can the DRV632 be used as an active filter?

Yes, the DRV632 can be configured as a second-order active low-pass filter using its operational amplifier core. With appropriate external R/C networks (e.g., R1=15 kΩ, R2=30 kΩ, R3=43 kΩ, C1=47 pF, C2=180 pF), it implements a multi-feedback (MFB) topology to suppress out-of-band DAC noise. TI's WEBENCH® Filter Designer supports exact component calculation for target cutoff frequencies and roll-off characteristics.